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Grapevine Wastes as a Source of Antioxidants: Comparison
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Please note this is a comparison between Version 2 by Beatrix Zheng and Version 1 by Radu Claudiu Fierascu.

Wine production is one of the most critical agro-industrial sectors worldwide, generating large amounts of waste with negative environmental impacts, but also with high economic value and several potential applications. From wine shoots to grape pomace or seeds, all of the wastes are rich sources of bioactive compounds with beneficial effects for human health, with these compounds being raw materials for other industries such as the pharmaceutical, cosmetic or food industries. Furthermore, these compounds present health benefits such as being antioxidants, supporting the immune system, anti-tumoral, or preventing cardiovascular and neural diseases.

  • grapevine wastes
  • biological applications
  • antioxidant
  • viticulture

1. Introduction

Viticulture is one of the world’s most recognizable agricultural activities, with a global grape production of 77.8 million tons per year [1]. Interest in vineyards has grown significantly worldwide. In the last 5 years, the European Union (EU) vineyard has presented a stable balance between deforestation and the planting of new vineyards, while China attains 3rd place worldwide after Spain and France in vineyard area [2] (Figure 1, according to statistics provided by the International Organization of Vine and Wine).
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Figure 1.
Percentages of vineyard areas of the main vine-growing countries in 2020.
Grape production is divided into three main categories: wine grapes (57%), table grapes (36%) and dried grapes (7%) [2] (Figure 2, according to statistics provided by the International Organization of Vine and Wine).
Figure 2. Grape production of the main producers and production per category (%): (a) grape production by country; (b) table grape production (%); (c) dried grape production (%); (d) wine grape production (%).
Waste products are generated at each stage of the winemaking process [3]. There are two distinct categories that show the origin of winery wastes: those that result from the collection of grapes (solid wastes), and those that result from the winemaking process (liquid wastes) [4]. The first category broadly involves grape stalks (7.5% of total solid wastes generated by winery), grape pomace (45%), grape seeds (6%) [5[5][6],6], stems, as well as wine yeasts [7]. Pomace represents 20–25% of the initial weight of the grapes, being a solid residue resulting from the processes of fermentation and pressing of the grapes [8].
Wine yeast accounts for about 5% of the total weight of grapes, being rich in ethanol, tartaric acid, phenolic compounds and yeast cells [9]. Grape skins represent 7% of the total weight of the grapes, usually being removed before the fermentation stage, in order to avoid excessive astringency of the wine. They are a rich source of phenolic compounds (especially tannins, flavan-3-ols, hydroxycinnamic acids, monomeric and oligomeric flavonols and stilbenes) [10] and lignocellulosic compounds (hemicellulose, cellulose and lignin), most of them with antioxidant properties [7].
Grape seeds are rich in antioxidant compounds such as vitamin E, phenolic compounds, phytosterols, fibers, proteins, carbohydrates and minerals, especially lipids, and melatonin [11]. In contrast, grape skins and pulp are a rich source of fiber, phenolic acids (gallic acid, vanilla and caftaric acid), flavonols (quercetin, myricetin and kaempferol), and anthocyanins [12]. However, the wine industry produces, in a short period of time, a large amount of waste and by-products, representing about 30% of the initial weight of the grapes [13,14][13][14]. The accumulation of these wastes can cause economic and environmental issues due to the organic matter, acidic pH, salinity and heavy metal content [15].

2. Development of Cosmetic Formulations Based on Bioactive Compounds Obtained from Grapevine Wastes

The cosmetics industry includes a wide range of products having as their main role the care, protection and improvement of skin (Figure 43). Given their final application, they can be classified into hygienic (deodorants, soaps), decorative (hair dyes, makeup) and protective (moisturizers, lubricants or sunscreens) products [38][16]. Each of them contains a basic substance, an active ingredient and a raw material or main ingredient. Classic preservatives in cosmetic formulations, mainly parabens or formaldehyde, exhibit negative effects on an organism, and were eventually replaced by natural ingredients. The process includes the extraction of biologically active principles (especially polyphenols) and their application in cosmetic formulations, as antioxidants for skin care [39][17]. Various scientific studies confirm the presence of high levels of bioactive compounds in grapevine wastes (especially canes, stems, leaves, etc.), the literature data presenting over 183 phenolic compounds, 78 stilbenes, 15 hydroxycinnamic acids, 9 hydroxybenzoic acids, 17 flavan-3-ols, 14 anthocyanins, 8 flavanoavonols, 2 flavones and 5 coumarins [40][18]. Many of these biocompounds can be successfully applied for the development of new cosmetic formulations [41][19].
Figure 43. The main applications of bioactive compounds obtained from grapevine waste extracts in cosmetic formulations.
Polyphenols play an important role in skin functionality, having moisturizing, smoothing, calming, softening and astringent effects. In addition, they soothe irritation and reduce the redness of the skin, accelerate the natural regeneration of the epidermis, and improve the microcirculation and elasticity of the skin [42][20]. They also protect the skin from harmful external factors, being used as active agents in cosmetic formulations as sun protection ingredients, having the same mechanism of action as chemical UV filters [43][21]. Oxidative stress, defined by Kawamura et al. [44][22] as a “disturbance of the oxidation-reduction balance in favor of oxidants”, can eventually lead to damage to biomolecules, changes in metabolism, increased DNA mutations, and an increased rate of cell mitosis [45][23]. In addition, the impact of oxidative stress on human body can generate inflammatory, cardiovascular, neurodegenerative or metabolic disorders, which in turn can lead to the development of cancer [46][24]. Free radicals and ROS (reactive oxygen species) are the main oxidizing agents in cellular systems, physiologically produced in various cellular biochemical reactions that occur in the organism, both in mitochondria for aerobic oxygen production, in the metabolism of fatty acids and drugs, and during the activity of the immune system [47][25]. Furthermore, they are involved in the aging process and in the evolution of many other types of diseases [48][26]. The aging process can be slowed down by using exogenous and endogenous antioxidants, which can readjust the level of oxidative stress in the human body [49][27]. The antioxidant effect of polyphenols (including those recovered from vineyard wastes) is to eliminate free radicals O2− and OH−, by donating a proton from a hydroxyl group attached to the aromatic ring. Thus, they prevent high levels of ROS, reactive nitrogen species and oxidation of sensitive biomolecules, proteins or lipids [46][24]. Skin aging is a continuous phenomenon, being caused by both internal factors (cellular metabolism, DNA metamorphosis, mitochondrial and genetic dysfunction) [50,51][28][29] and external ones (including lifestyle, diet, pollution, smoking, UV light and other environmental factors) [52][30]. In addition to their antioxidant properties, polyphenols can inhibit the enzymes (tyrosinase, collagenase and elastase) responsible for the aging process of the skin [53,54][31][32]. Thus, gallic acid, chlorogenic acid, epicatechin, rutin, and resveratrol, which are found in vine-leaf extract, can inhibit the activity of tyrosinase with an IC50 value of 3.84 mg/mL of tyrosinase inhibition, and thus the extracts can be used in cosmetic formulations as a natural whitening agent [55][33]. In many cases, nanoformulation of resveratrol might be a reliable solution to increase its efficiency because it is unstable against temperature, pH and light and has low solubility in water [56][34]. Resveratrol-based gel (0.01% weight by volume, applied once a day) may improve the severity of acne and the average surface of microcomedones without any reported side effects [57][35], while resveratrol-enriched products can ameliorate facial redness [58][36]. In a recent study, Leal et al. [59][37] propose the use of grapevine stem extracts (Syrah variety) as raw material in cosmetic products to combat skin wrinkling and pigmentation. In addition, they exhibit anti-inflammatory activity (by inhibiting the nitrite production at non-toxic cell concentrations), anti-aging activity by suppressing the enzymes tyrosinase (53%) and elastase (98.02%), and antimicrobial effects on gram-positive bacteria, having the ability to inhibit the growth of ulcerated bacteria in wounds to the foot [59][37]. Grape seed oil is known to be rich in unsaturated fatty acids and phenolic compounds [60,61][38][39]. Furthermore, high levels of antioxidants from grape seeds exert a protective effect on the skin by increasing cellular resistance and protecting fibroblasts from UV damage by absorbing it [62][40]. Based on all these considerations, grape seeds can serve as value added to cosmetic formulations [62][40]. In the composition of some sunscreens, extracts with compounds that exhibit anti-inflammatory activity to reduce UVB-induced erythema or to increase the protection factor (SPF) have been added [63][41]. In vitro studies on the photostability of the formulation containing 10% w/w grape pomace extract and 11.5% w/w UV filters showed an SPF value of 16 and an antioxidant activity of 519.92 ± 0.00 μmol Trolox equivalents/g [64][42]. Furthermore, the methodology proposed by Michailidis et al. [65][43] proposes the use of grape seed extracts obtained by ultrasound-assisted extraction in dermo-cosmetic products, as anti-elastase and anti-tyrosinase factors [65][43]. Grape seed extracts (GSE) have been successfully used in the formulation of emulsions and emulgels. In a detailed study, Rafique et al. [66][44] demonstrated the anti-inflammatory and anti-wrinkle properties of polyphenols from grape seeds, properties that increase skin hydration and elasticity. The proposed emulsion consists of an oily phase containing propylene paraben (preservative)/paraffin oil/Abil-EM 90 (emulsifier)/distilled water/5% grape seed extract. In parallel, the emulgel was formed by mixing the oily phase with an aqueous phase (containing grape seed extract) and finally with a gel phase (created by homogenizing the Carbopol 940 with water). The authors claim that, due to its twice as well-controlled release effect, the emulgel has better anti-aging properties than the emulsion. Another type of oil-in-water emulsion was developed by Yarovaya et al. [62][40]. In the aqueous phase (containing glycerin and water) xanthan gum was dispersed until a uniform gel was formed. The oily phase was formed in two stages: (i) emulsion consisting of mineral oil, cetyl alcohol and cetamacrogol 1000, over which the aqueous phase and grape seed extract were added and (ii) emulsion containing both grape seed extract and octyl methoxycinnamate. A preservative was added to the mixture of these two parts. The results showed that cells can be protected against UVA radiation if a concentration of 25 μg/mL of GSE is used (this increases the activity of dermal fibroblasts). At the same time, the octyl methoxycinnamate plays an important role in cosmetic formulation because it increases the absorption capacity of the UV filter [62][40]. Grape cane extracts enriched with polyphenols may activate SIRT1 (a cell longevity protein) and have the ability to inhibit tyrosinase as effectively as pure E-resveratrol and E-ε-viniferin, having utility against dark spots or as skin-lightening agents in eco-dermocosmetic products [67][45]. In a 28-day study on 60 female subjects, shoot extracts (serum/cream formulation) proved anti-aging effects through increasing radiant glow, evenness, smoothness, hydration, texture, softness effects and decreasing of wrinkles and fine lines [68][46]. A topical formulation was created by Moreira et al. [69][47] using subcritical water vine-cane extract with high antioxidant properties. The ingredients used for this purpose were: glycerin (7%)/Carbopol (0.5%)/triethanolamine (0.3%)/preservative (phenoxyethanol/methyl paraben/ethyl paraben/propyl paraben/butyl paraben mixture, 0.1%)/perfume (0.1%). The cosmetic formulation was achieved by dissolving the Carbopol in a mixture of extract/water: 75%/17% ratio at room temperature, while to form a homogeneous gel, triethanolamine was added under continuous stirring. Furthermore, vine cane extracts effectively inhibit the formation of biofilm on Candida albicans and Candida parapsilosis strains, with a minimum inhibitory concentration (MIC) value of 5 mg/L and 30 mg/L respectively [70][48]. The extracts obtained from tendrils and leaves of Vitis vinifera L. have shown antioxidant activities (in the DPPH and ferric reducing antioxidant power — FRAP assays) and anti-inflammatory capabilities by mitigating the proinflammatory response induced by the exposure to lipopolysaccharides of human gingival fibroblasts cells. The authors suggest that they may be used in oral hygiene products for periodontal disease [71][49]. In another study, Singla et al. obtained a mouthwash solution based on grape seeds. From in vitro studies, the grape-based oral care formulation showed a reduction of 12.5 % in oral streptococci [72][50]. In a formulated cream based on an oil/water emulsion, Carica papaya leaf, Psidium guajava leaf and Vitis vinifera seeds were used as natural preservatives. The obtained emulsion showed a promising antibacterial effect against the proliferation of various microorganisms, as the concentration of grape seed extract was higher [73][51]. Extracts rich in stilbene, obtained from grapevine cane waste (Ohanes, Regent, Pinot noir and Tin-tilla de Rota), have showed high antioxidant activity. Thus, they can be used as a natural raw material in nutraceutical applications, but also as natural fungicides [35][52]. Some representative examples regarding the application of compounds from grapevine wastes in cosmetic industry are presented in Table 21.
Table 21. Some examples of grapevine wastes application in cosmetic formulations.
 Some examples of grapevine wastes application in cosmetic formulations.
Extracted WastesFormulationPotential ApplicationRef.
Vine canesTopical formulation: vine-cane extract/glycerin (7%)/carbopol (0.5%)/triethanolamine (0.3%)/preservative (phenoxyethanol/methyl paraben/ethyl paraben/propyl paraben/butyl paraben mixture, 0.1%)/perfume (0.1%).Protection against different oxidants[47]
Extracts enriched with polyphenolsUtility against dark spots or as skin-lightening agents[45]
Vine shootsSerum: vine shoot extract 0.045%/biotechnological extract—Ronacare Hydroine 1%Anti-aging effects[46]
Grape seedsEmulsion: oily phase containing propylene paraben (preservative)/paraffin oil/Abil-EM 90 (emulsifier)/distilled water/5% grape seed extractAnti-aging[44]
Emulgel: oily phase + aqueous phase (containing grape seeds extract) + gel phase (Carbopol 940/water)Anti-aging
Emulsion: 5% mineral oil/7% cetomacrogol 1000/2% cetyl alcohol/7% octyl methoxycinnamate/3% grape seed extract/1% xanthan/5% glycerin/0.5% phenoxyethanol/purified water qs to 100UVA protection[40]
Extract obtained via an ultrasound-assisted methodAnti-elastase and anti-tyrosinase factors in dermo-cosmetics[43]
Grape pomaceSunscreen: 10% w/w grape pomace extract and 11.5% w/w UV (Butylmethoxydibenzoyl methane—UVA, ethylhexyl methoxycinnamate and ethylhexyl dimethyl PABA-UVB)UV protection[42]
Extract as raw materialCombat skin wrinkling and pigmentation/ability to inhibits the growth of ulcerated bacteria in wounds to the foot[37]

3. Applications in the Food and Beverage Industries

The food industry is one of the main industries that generates different types of waste. Worldwide, the interest in new valorization mechanisms has increased significantly in order to protect resources and the environment [74][53]. Due to its phytochemical profile, abundant polyphenols and fibers, and exhibiting of high antioxidant and antimicrobial activities, grapevine waste extract (vine shoots, grape stalks and wine lees) might be efficiently used in the food sector as an oenological and functional additive, functional food or even as fillers in food packaging [24][54]. Therefore, adding grape by-products (pomace) into animals’ diets has been shown to be effective in increasing the nutritional value of their meat. In the same way, they have been added to the diets of poultry, observing the ratio improvement of polyunsaturated and saturated fatty acids [75,76][55][56]. Furthermore, the use of grape stems and wine lees grape extracts as feed additives in broilers’ diets improves the quality of the meat [77][57]. De Iseppi et al. [78][58] proposed the use of wine yeast glycocompounds (a winemaking by-product) in order to improve both the sensory properties and stability of wine. Results obtained in the case of wine lees extracted by autoclave showed an enhancement of wine foaming along with the efficient recovery of tartrates from its insoluble fraction, and the yeast extracted by enzymatic and ultrasound methods stabilizes the proteins from heat-sensitive wine [78][58]. Raposo et al. [79][59] studied extracts from vine shoots, which contain 29% stilbenes, for their potential preservative effect on bottled wine. In the initial phase, the wines treated with shoot extracts presented qualitative superior oenological parameters and higher values of purity and color intensity; unfortunately, these characteristics are not maintained after a year [79][59]. Additionally, Gutiérrez-Escobar et al. [80][60] have studied the possibility of the replacement of SO2 in wine with pure stilbene extracts from grapevine shoots. The natural extracts, abundant in E-ε-viniferin (70%) and E-resveratrol (18%) and with no aromatic compounds, exhibited high antimicrobial activity against Brettanomyces bruxellensis and Zygosaccharomyces bailli yeasts strains. Thus, vine shoot extract might be used as a preservative of wine as well as to increase its stilbenes content [80][60]. Various scientific studies report the applicability of grape stems extracts in the food industry. Phenolic acids, flavanols and tannins from dried and milled vine stems have the ability to remove unstable proteins, being used as a replacement for bentonite (a clay used in wine to avoid protein haze formation) [81][61]. The hydroalcoholic extracts of grape stems play an important role in the inhibition of food pathogens such as Listeria monocytogenes, Staphylococcus aureus, Salmonella enterica subsp. enterica serovar Typhimurium and Escherichia coli in the cases of lettuce and spinach [82][62]. By drying, crushing and autolysis of wine yeast, proteins are successfully extracted and applied in the production of fortified cereal bars, improving their protein content [83][63]. Due to their phytochemical composition, wine lees can also enhance the antioxidant and antimicrobial activity and phenolic compounds in burgers, being used as an alternative to synthetic additives [84][64]. Phenolic compounds and dietary fiber from wine lees can be also used in the production of high added-value ice cream, conferring better structure, high antioxidant content and inhibitory effect towards the oxidation of human erythrocyte membranes [85][65], enhancing their physical, chemical and sensory properties, along with protection against Lactobacillus acidophilus during storage [86][66]. Iuga et al. [87][67] proposed the use of grape seeds and pomace as secondary flours in the production of pasta and pastry products, having the effect of improving the functional ingredients in these branches of the food industry [87][67]. In the same way, the flours obtained from these types of waste offer physico-chemical characteristics within the nutritional standards, being applied in the biscuit industry [88][68]. The negative effects of plastic materials on the environment have led the scientific community to develop new biodegradable materials. Thus, insoluble lignocellulosic fibers extracted from grape stalks are used as foams in food packaging, giving them improved mechanical properties, high resistance to moisture and biodegradable characteristics [89][69]. Díaz-Galindo et al. [90][70] created a new sustainable food packaging formula based on polylactic acid loaded with grapevine cane extract (5–15 wt%), aiming to prevent food contamination throughout transport and storage. The material showed thermal stability up to 300 °C and resistance values at traction similar to those of commercial materials; the addition of larger amounts of extract increases the breaking strength of the films. Some representative examples regarding the application of compounds from grapevine wastes in food and beverage industry are presented in Table 32.
Table 32. Applications of grapevine wastes-derived products in food and beverage industry.
 Applications of grapevine wastes-derived products in food and beverage industry.
Type of WastesApplicationEffectRef.
Grape pomaceAdded into animals’ dietsIncreasing the nutritional value of meat[55]
Pasta and pastry products as secondary floursGrowing functional ingredients in food industry[67]
Grape stems/stalksDisinfectants in cases of leafy fresh vegetables: lettuce and spinachInhibition of pathogens Listeria monocytogenes, Staphylococcus aureus, Salmonella enterica subsp. enterica serovar Typhimurium and Escherichia coli[62]
Substitute for bentonite in wineRemoving unstable proteins[61]
Food packaging as foamsIncreased mechanical properties, high resistance to moisture, biodegradable characteristics[69]
Grapevine canesFood packaging formula (polylactic acid loaded with grapevine cane ex-tract)Prevent food contamination during transport and storage; increases the breaking strength of the packaging films[70]
Grape stems and wine leesFeed additives in broilers’ dietsImprovement of meat quality[57]
Vine shootsPreservative of wineIncreased quality of oenological parameters and higher values of purity and color intensity[59]
Replacement of SO2 in wineHigh antimicrobial activity against Brettanomyces bruxellensis and Zygosaccharomyces bailli; increased wine stilbene content[60]
Wine leesWine industryReversing wine foam and stabilizing proteins in heat-sensitive wine[58]
Development of fortified cereal barsImproving protein content[63]
Alternative to synthetic additivesEnhancement of antioxidant and antimicrobial activity in burgers[64]
Production of high added-value ice creamSuperior structure, high antioxidant effect, oxidation inhibition on human erythrocyte membranes[65]
Production of high added-value ice creamEnhanced physical, chemical and sensory properties, protection against Lactobacillus acidophilus during storage[66]

4. Potential Uses of Grapevine Waste-Derived Products in Biomedical Applications

It is well known that the long-term use of commercial synthetic drugs presents side effects on human health [91][71]. Various scientific papers claim the benefits that polyphenols recovered from different plants in general, and from grapevine wastes in particular, can bring on human health, by protecting the cardiovascular system and neurons as well as anticancer activity [92,93,94,95,96,97][72][73][74][75][76][77]. In different parts of the grapevine, there are different nutritional components such as proteins, lipids, carbohydrates, minerals, vitamins and a wide diversity of bioactive compounds that can have antioxidant, antiviral, antiplatelet, antifungal, anti-cataract, anti-obesity, anticholinergic, and anti-inflammatory effects among others [98][78]. As mentioned before, winemaking by-products consist of high levels of polyphenols and dietary fiber that fulfil various beneficial roles on human health, namely cardiovascular disease and obesity prevention, control of glucose absorption and the levels of cholesterol in blood [99,100][79][80]. One of the main radical generators involved in cell damage is the powerful oxidant called peroxynitrite (ONOO−). Thus, quercetin, catechin and epicatechin extracted from grape seeds and skins lead to IC50 values of 48.8, 55.7 and 56.7 mM [101][81]. Two potential inhibitor compounds of amyloid β-protein 25−35 (Aβ) were recovered from grapevine extracts, namely ampelopsin A and piceatannol [102][82]. It is known that ampelopsin A is responsible for the in vivo protection against brain cell dysfunction by blocking the aggregation of Aβ [103][83]. In addition, piacetamol (a hydroxyresveratrol) has cardioprotective activity and can also decrease neuronal inflammation in microglial cells [104][84]. Another compound that can prevent the aggregation of amyloid-β peptides was isolated by Chaher et al. from vine shoot extracts. Thus, the newly isolated compound, Vitisinol C, showed an EC50 value of 5 ± 3 (μmol/L), being proposed for use in the evolution of pharmaceutical therapy for Alzheimer’s disease [105][85]. Nowadays, it is a generally accepted premise that moderate and regular consumption of red wine might be the key to the prevention of cardiovascular, oncological and neurodegenerative diseases, type 2 diabetes and other chronic diseases [106][86]. However, winemaking by-products present a much higher total content of anthocyanins, stilbenes, and flavanols, being much more effective in antioxidant therapy than wine itself [107][87]. Bioactive compounds from wine by-products exert their protective effect on disorders caused by oxidative stress or inflammatory processes [108][88]. Thus, flavonoids from grape pomace can decrease the production of RONS (reactive oxygen species and nitrogen) by inhibiting the enzymes that produce them, in particular NOX4 (NADPH oxidase 4), eNOS (endothelial nitric oxide synthase), COX2 (ciclooxigenase 2) and SOD1 and 2 (superoxide dismutase 1 and 2), upregulating NF-κB (nuclear factor-kappa B) and downregulating Nrf2 (nuclear factor erythroid 2-related factor 2) pathways [109][89]. Enzymatic grape pomace extracts can adapt, in vitro, the transcription of 7α-hydroxylase cholesterol and 27-hydroxylase sterol [110][90], and ex vivo tests in Wistar rats show lowering levels of VLDL cholesterol and triacylglycerol [106][86]. Ulcerative colitis, induced by acetic acid, showed ulceration, edema and erosions to the colon in laboratory mice. Histological examination presented an improvement in the intensity and distribution of lesions during the treatment with 0.15 and 0.1 mg of grape pomace seeds [111][91]. Following the evaluation of grape stem extracts, Quero et al. [112][92] reported the effects they have on cancer cells (Caco-2, MCF-7, and MDA-MB-231) and also on the intestinal barrier (differentiated Caco-2 cells), suggesting them as a promising factor in cancer treatment and in adjustment of ROS in the gastrointestinal tract. The extracts exerted a decreasing effect on the growth of cancer cells, causing death by apoptosis and an inhibitory effect on the antioxidant enzyme TrxR1, which is responsible for the growth of ROS at the cellular level. In the intestinal barrier, bioactive compounds produce an antioxidant effect providing protection to the intestine in the case of disturbances associated with oxidative stress [112][92]. Similarly, grape seed extracts from the Negramaro variety were found to be able to induce apoptotic cell death in MCF-7 breast cancer cells. Researchers demonstrated that this effect of grape seed extracts is mediated by improving gap-junction-mediated cell–cell communications through reallocating connexin-43 proteins on plasma membranes and controlling cx43 mRNA expression [113][93]. A preliminary test over 14 days was performed on rats, to which a pretreatment with 4 mL/kg/day grape seed oil (GSO) was applied, following the experimental induction of ischemia by a single administration of isoproterenol (ISO) 45 mg/kg after 14 days. The final results showed that GSO pretreatment has the ability to remarkably decrease the ventricular conduction, the levels of proinflammatory cytokines and the myocardial fraction of creatine kinase, thus providing a cardioprotective effect in ISO-induced myocardial ischemia [114][94]. In the case of Cyclophosphamide-induced cardiotoxicity (a single dose of 200 mg/kg/b.w.), a pretreatment consisting of grape seed extracts (oral administration on rats, 150 and 300 mg/kg doses for 6 weeks) has the ability to protect the liver and heart tissue, and may also have an ameliorating effect on oxidative and apoptotic biomarkers, as well as the activity of liver and heart function enzymes [115][95]. Grape seed extracts were also proven to possess the capacity to reduce two digestive enzymes, namely pancreatic lipases and α-glucosidases, thus having utility in preventing obesity [116][96]. According to Doshi et al. [117][97], grape seeds and stems may be a new source of insulin secretagogues, suggesting their application in the treatment of type II diabetes. In the presence of these waste extracts, clinical trials on mice showed that, in the pancreatic islets, there is a 2- to 8-fold increase in insulin secretion at a concentration of 5.5 mM and 16.5 mM glucose [117][97]. One of the major risk factors for cardiovascular disease is represented by hypertension. Thus, Odai et al. [118][98] conducted a scientific study in which, for 12 weeks, they administered high doses of grape seed proanthocyanidin extract (400 mg) to 6 men and 24 women, all middle-aged and prehypertensive. The final results revealed an improvement in vascular elasticity and a decrease in systolic blood pressure by 13 mmHg after 12 weeks [118][98]. Two experimental pathways have been adopted by Empl et al. [119][99] to investigate the possibility of using grapevine shoots extracts as agents in the prevention of human gastrointestinal cancer. In vivo research on ApcMin mice, which were subject to a high-fat diet similar to a human model of adenomatous polyposis, reported that both low and high doses of grapevine shoot extracts have the ability to reduce the number (in males) and volume (in females) of intestinal adenoma. An in vitro experiment was conducted on APC10.1 cells derived from one ApcMin mouse, showing that shoot extracts may reduce the increase in APC10.1 cells by stopping the cycle and cell sequence, as well as by lessening the number of cells [120][100]. The neuroprotective effects of organic and conventional extracts from grapevine leaves have been analyzed by their ability to diminish protein and lipid damage and by adjustment of enzymatic antioxidant activity. Organic extracts have shown a protective effect on oxidative deterioration (caused by hydrogen peroxide in the brain of rats) of lipids and proteins in the hippocampus and cerebellum tissues. The conventional ones could reduce TBARS (thiobarbituric acid reactive species) levels in the cortex [120][100]. The MTT test, applied to evaluate the antiproliferative activity of grape leaf extracts on melanoma A375 and SK-MEL cells, revealed that, with increasing water concentrations and methanolic leaf extracts (1.136, 2.27 and 4.54 mg/mL), a decrease in melanoma cell proliferation is observed during 72 h. Thus, the extracts exert an antiproliferative effect comparable to Cisplatinium [121][101]. Meng et al. [122][102] induced obesity in mice by applying a high-fat diet, containing 60% kcal from fat. They claim that the intragastric application of leaf extract (400 mg/(kg × day) inhibits the secretion of pancreatic lipase (IC50 = 1.18 mg/mL), supports the secretion of fibroblast growth factor-15 (which stops the synthesis of bile acids and fatty acids) and can reduce food intake by suppressing orexigenic neuropeptide-Y. All these aspects can lead to a lower level of serum cholesterol and low-density lipoproteins in triglycerides, while also decreasing the amount of tissue fat. Thus, leaf extracts may be a natural source of components for preventing obesity mediated by neuropeptide-Y and bile acids [122][102]. Some representative examples regarding the biomedical applications of compounds from grapevine wastes are presented in Table 43.
Table 43. Examples of biomedical applications of compounds from grapevine wastes.
 Examples of biomedical applications of compounds from grapevine wastes.
WasteType of StudyBiomedical ActivityEffectRef.
Grape leavesIn vivoAntiproliferativeReduce melanoma A375 and SK-MEL cells proliferation over 72 h; induce antiproliferative effect comparable to Cisplatinium[101]
NeuroprotectiveProtection against oxidative deterioration of lipids and proteins in the hippocampus and cerebellum tissues; reduce levels of thiobarbituric acid reactive species in the cortex[100]
Obesity preventionInhibit the secretion of pancreatic lipase; increase the secretion of fibroblast growth factor-15; decrease levels of serum cholesterol and low-density lipoproteins in triglycerides; reduced the amount of tissue fat[102]
Grape seedsDecrease pancreatic lipases and α-glucosidases[96]
Grape pomaceIn vitroAnti-cholesterolTranscription of 7α-hydroxylase cholesterol and 27-hydroxylase sterol[90]
Ex-vivoReduce VLDL cholesterol and triacylglycerol[86]
In vivoInflammatory bowel disorders preventionDecrease intensity and distribution of ulcerations, edema and erosions in the colon[91]
Grape shootsIn vivoAnticarcinogenicDecrease the number of intestinal adenoma (male mice); decrease the volume of intestinal adenoma (female mice)[99]
In vitroReduce the increasing of APC10.1 cells number; stopping the cycle and cell sequence
Grape stemsIn vivoReduce growth of Caco-2, MCF-7, and MDA-MB-231 cancer cells; inhibition effect on the enzyme TrxR1; protection of the intestine[92]
Grape seedsInduce apoptotic cell death to MCF-7 cancer cells[93]
CardioprotectiveReduce ventricular conduction; decrease levels of proinflammatory cytokines; reduce myocardial fraction of creatine kinase; protective effect in ISO-induced myocardial ischemia[94]
Ameliorating effect on oxidative and apoptotic biomarkers; ameliorating activity of liver and heart function enzymes[95]
Hypertension preventionImprovement of vascular elasticity; reduced systolic blood pressure by 13 mmHg after 12 weeks[98]
Grape stems and seedsType II diabetes preventionIncreased insulin secretion in the pancreatic islets[97]

References

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