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Chen, B. Carotenoids. Encyclopedia. Available online: https://encyclopedia.pub/entry/9596 (accessed on 09 August 2024).
Chen B. Carotenoids. Encyclopedia. Available at: https://encyclopedia.pub/entry/9596. Accessed August 09, 2024.
Chen, Bing-Huei. "Carotenoids" Encyclopedia, https://encyclopedia.pub/entry/9596 (accessed August 09, 2024).
Chen, B. (2021, May 13). Carotenoids. In Encyclopedia. https://encyclopedia.pub/entry/9596
Chen, Bing-Huei. "Carotenoids." Encyclopedia. Web. 13 May, 2021.
Carotenoids
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This entry is adapted from the peer-reviewed paper 10.3390/antiox10050713

Carotenoids are colored natural pigments belonging to a large family of C40 skeleton with eight isoprene molecules.

nanoencapsulation carotenoid in vitro release antioxidant activity

1. Introduction

Carotenoids are colored natural pigments belonging to a large family of C40 skeleton with eight isoprene molecules [1]. They are classified into xanthophylls and carotenes with the former such as lutein, β-cryptoxanthin and astaxanthin containing one or more oxygen atoms, while the latter such as α- carotene and β-carotene, lycopene and phytoene consisting of hydrogen and carbon atoms [2]. Carotenoid-rich foods have received great attention in human health due to their physiological functions such as antioxidant and anti-cancer as well as the ability to prevent chronic diseases such as age-associated macular degeneration and cardiovascular disease [3][4]. It has been well demonstrated that the functional properties of carotenoids were associated with their chemical structure i.e., the number of conjugated double bonds and the presence of different kinds of end-groups. However, these structural properties are also responsible for the carotenoid’s instability to light, high temperature, oxygen and metal ions, resulting in high susceptibility to oxidation and low bioavailability [3].

Given the multiple health benefits of carotenoids, they are widely used as a natural colorant and antioxidant in both pharmaceutical and food industries for prolonging shelf-life in dairy, meat, confectionary and beverage products [2]. However, carotenoids may undergo loss in functional properties during food processing owing to their instability and interaction with other food ingredients. Also the presence of digestive enzymes and some other nutrients in vivo as well as pH can alter carotenoid stability [4]. Consequently, it is vital to develop novel techniques to prevent carotenoid degradation for enhancement of bioavailability and bioactivity. Over the past decade, micro- and/or nano-encapsulation have emerged as imperative techniques for formulating food-based carotenoid carriers with improved physicochemical property and release behavior, as well as for prolonging blood circulation and efficient cellular uptake [2][5]. Comparatively, the microencapsulation technique fails to produce nanoparticles that are capable of penetrating into deeper portions of specific organs and tissues, resulting in poor bioavailability and bioactivity in vivo [6][7]. Thus, the transformation from microencapsulation to nanoencapsulation plays a pivotal role in reducing particles to nanosize by employing either top-down or bottom-up methods [8].

Recent advancements in the field of nanoscience and nanotechnology have enabled preparation of nanoscale functional compounds by encapsulating into a wide variety of nanostructures including nanoemulsions (NEs), nanoliposomes (NLs), nanocapsules (NCs), nanofibers (NFs), nanoparticles (NPs), solid lipid nanoparticles (SLNPs), nanostructured lipid carriers (NLCs) and supercritical fluid-based nanoparticles [4][5][9]. Based on the bibliometric search conducted in the Web of Science database (version 5.34) using keywords such as carotenoid nanoemulsion, carotenoid nanoparticle, carotenoid nanoencapsulation, carotenoid nanoliposome, carotenoid liposome, carotenoid micelle and carotenoid dispersion, the number of articles published from 2015-2020 was 441, of which the publications from 2019–2020 was higher (229) in terms of publication rate compared to that published between 2015–2018 (212). This trend is in line with the previous bibliometric studies [10][11]. Moreover, of the top 10 countries listed on research publications in carotenoid nanoencapsulation (2015–2020), China showed the highest publication output (23.7%) followed by USA (16.3%), Brazil (14.5%), Iran (14.5%), India (13.6%), while the other five countries including Saudi Arabia, Romania, Turkey, Pakistan and Italy, accounting for 17.4%, with an overall contribution from Asia, Europe and Americas being 60, 20 and 20%, respectively (Figure 1). Further analysis on difference in research characteristics among the top five highly-contributed countries during 2015–2020 showed that China (30) dominated with studies related to preparation and stability evaluation of nanocarotenoids, followed by Iran (20), India (19), USA (17) and Brazil (13). Likewise, most nanocarotenoid studies dealing with in vitro gastrointestinal release and bioavailability were from China (20), followed by USA (19), Iran (18), India (12) and Brazil (10). Many studies have also focused on fortification of nanoencpasulated carotenoids in a wide range of functional foods in dairy, bakery, and confectionary industries over last five years, with the top five countries accounting for 2.8–9.3% of total nanocarotenoid publications. For in vivo studies, although there was less publications by top 5 countries (5–22), a significant research output is apparent. Notably, China remained on the top with 22 publications dealing with determination of bioavailability and bioaccessibility, followed by USA (14), Iran/India (10 each) and Brazil (5). This highlights the need for many in vivo studies for proof-of-concept, functional validation, utility and clinical relevance of nanocarotenoids, which can be attained through promoting collaborative researches among institutes and countries for translation of nanocarotenoids into a botanic drug.

Antioxidants 10 00713 g001 550

Figure 1. Research on carotenoid nanoemulsions over the last 5 years. The number of publications and global distribution. Source: Web of Science™.

Reported studies on nanocarotenoids were mainly dealing with formulation of nanosized carotenoid carriers by nanotechniques, characterization and stability evaluation as well as determination of in vitro release behavior, bioaccessibility, bioavailability and biological activity [5].

2. Carotenoid Biosynthesis and Stability-Overview

Carotenoids, a class of isoprenoids, are formed by the C5 building units of isopentenyl diphosphate and dimethylallyl diphosphate, obtained separately by two different pathways including the mevalonate (MVA) and the 2-C-methyl-D-erythritol 4-phosphate (MEP) pathways [12]. The isopentenyl diphosphate undergoes isomerization to yield dimethylallyl diphosphate, which further condenses with another molecule of isopentenyl diphosphate to yield C20 geranylgeranyl pyrophosphate. Then the two molecules of geranylgeranyl pyrophosphate combine with each other to yield the first carotenoid molecule phytoene (C40) and sequential incorporation of double bonds at alternate positions of phytoene, resulting in formation of phytofluene, ζ-carotene, neurosporene and lycopene (Figure 2) [13]. Through branched cyclization of lycopene, carotenoids with one β-ring and one ε-ring (e.g., α-carotene and lutein) and two β-rings (β-carotene, zeaxanthin and antheraxanthin) are produced. Further advancement of carotenoid synthesis occurred through attachment of oxygen moieties to hydrocarbon carotenoids such as α-carotene and β-carotene for formation of xanthophylls (Figure 2) [13].

Antioxidants 10 00713 g002 550

Figure 2. General overview of carotenoid biosynthesis pathway. DOXP = 1-deoxy-D-xylulose, GA-3-P = glyceraldehyde 3-phosphate, IPP = isopentyl diphosphate, DMAPP = dimethylallyl diphosphate and GGPP = geranylgeranyl pyrophosphate; 1 = phytoene synthase, 2 = phytoene desaturase, 3 = ζ-carotene desaturase, 4 = lycopene e-cyclase, 5 = lycopene β-cyclase; 6 = β-carotene hydroxylase, 7 = zeaxanthin epoxidase and 8 = violaxanthin de-epoxidase; A = desaturation, B = cyclization, C = hydroxylation and D = epoxidation.

The presence of long-chain conjugated double bonds in carotenoids makes them highly susceptible to degradation under acid, light and high temperature conditions [3]. For instance, carotenoids were shown to degrade at a faster rate in the presence of light through generation of singlet oxygen that eventually binds with the hydrocarbon chain in carotenoids leading to degradation [14]. More recently, two theories have been proposed for oxidative degradation of carotenoids, namely random and central cleavage theories, with oxidation occurring randomly at different sites or at the central bond of a carotenoid molecule, respectively [15]. In a study dealing with thermal degradation of lutein and β-carotene, Giménez, et al. [16] reported a progressive increase in degradation following a rise in heating temperature from 30–90 °C. Also, β-carotene could undergo degradation to form epoxides and carbonyl compounds (apocarotenals) via a free radical reduction mechanism [13]. Thus, owing to the instability of carotenoids caused by multiple factors, it is important to develop appropriate strategies for preventing degradation, prolonging shelf-life and enhancing bioavailability of carotenoids.

3. Conventional Microencapsulation vs. Nanoencapsulation

Microencapsulation of unstable and water-insoluble bioactive compounds such as carotenoids involves trapping them within a special coating material for preparation of micron-sized particles with a mean size ranging from 1 to 500 µm. Micronized spherical particles are capable of controlling both loading and releasing of bioactive compounds [17]. The conventional microencapsulation process can be broadly classified into three categories depending on how microparticles are prepared including chemical, physicochemical and physicomechanical processes [18][19]. For example, Polyakov and Kispert [20] reviewed a carotenoid inclusion complex (e.g., β-carotene enriched inclusion complex) with polysaccharides including arabinogalactan, cyclodextrin and glycyrrhizin, and demonstrated increased stability and bioavailability compared to free carotenoids, while García, et al. [21] reported an enhanced thermal stability (up to 100 °C) of spherical microcapsules produced from carotenoid-rich mango, banana and tamarillo powders by spray-drying with maltodextrin. Likewise, several studies have demonstrated the ability of microencapsulated carotenoids to improve physicochemical characteristics, storage stability and bioavailability for further development into value-added functional foods [22][23][24][25][26]. Several microencapsulation techniques used for enhancement of carotenoid stability and bioavailability have been reviewed by Soukoulis and Bohn [2].

Although the microencapsulation techniques are efficient, the recent clean labelling trends have prevented the use of dairy, lactose, sugar, sodium, gluten, fats and carbohydrate as coating material, thus further limiting the choice of suitable encapsulation materials [27]. In addition, the most commonly used encapsulant maltodextrin possesses low emulsifying ability thereby reducing the encapsulation efficiency (EE) [28]. More recently, Sun, et al. [6] pointed out that the average size of microcapsules is a critical parameter which can significantly affect the physicochemical characteristics, stability, sensory property, bioavailability and release behavior. Also, micron-sized particles have many drawbacks such as nontargeting of specific organs, tissues and cells as well as instability, poor aqueous solubility and low bioavailability in human body [7]. Therefore, it is necessary to decrease the size of encapsulated material to sub-micron (0.10–10 μm) and nano size (<0.10 μm).

Due to the increasing prevalence rate of chronic diseases, the emerging challenges in delivering functional compounds to target tissues, organs and cells, as well as instability, poor aqueous solubility and bioavailability, and low release and absorption in vivo could not be overcome by microencapsulation techniques [7]. Recent developments in the field of nanotechnology have provided some excellent means to reduce particle size through top-down (high energy method) or bottom up (self-assembly) processes [29]. Such reduction in particle size has been shown to enhance the stability, targeting ability, bioavailability and release properties [30]. Most importantly, the reduction in particle size enables penetration into deeper portions of cells or tissues resulting in high bioavailability [31]. In the following sections, we have reviewed the research articles published within the last five years on nanoencapsulation of various carotenoid compounds by using different preparation techniques. These studies demonstrated the impact of nanoencapsulation to improve physicochemical property, bioavailability, controlled release and bioactivity. Table 1 and Table 2 summarize various nanosystems used for encapsulation of carotenoids and highlight their advantages as well as disadvantages, respectively.

Table 1. Nanosystems for encapsulation of carotenoids 1.

Nanosystem Carotenoids Particle Size (nm) EE (%) Zeta Potential (mV) Storage Stability (Days) References
Nanoemulsions β-carotene 218 NA 40 21 at 37 °C [32]
143.7 −38.2 30 at 25 °C [33]
Microbial carotenoids 142.1 NA 30 at 25 °C [34]
Carotenoids 290 to 350 −53.4 to −58.8 21 at 25 °C [35]
β-carotene 198.4 to 315.6 −29.9 to −38.5 90 at 4, 25, and 37 °C [36]
Carotenoids <200 −30 to −45 35 at 25 °C [37]
Lycopene 145.1 to 161.9 −19.7 to −20.7 1 at 25 °C [38]
200.1 to 287.1 61 to 89.1 20 to 45 42 at 4, 25, and 37 °C [39]
Polymeric/biopolymeric NPs Carotenoids 153 83.7 NA NA [40]
84.4 >96 −41.3 to −43.6 60 at 41 °C [41]
β-carotene 77.8 to 371.8 98.7 to 99.1 −37.8 to −29.9 NA [42]
β-carotene 70.4 97.4 NA NA [43]
Lycopene 152 89 58.3 NA [44]
~ 200 >95 −36 210 at 5 °C [45]
193 NA −11.5 14 at 25 °C [46]
Lutein <250 74.5 −27.2 NA [47]
Lutein 240 to 340 ~91.9 NA NA [48]
Crocetin 288 to 584 59.6 to 97.2 NA NA [49]
Fucoxanthin 200 to 500 47 to 90 30 to 50 6 at 37 °C [50]
Nanoliposomes/liposomes Carotenoids 70 to100 75 −5.3 NA [51]
β-carotene 162.8 to 365.8 ~98 64.5 to 42.6 70 at 4 °C [52]
Astaxanthin 80.6 97.6 31.8 15 at 4 and 25 °C [53]
60 to 80 97.4 NA NA [54]
Lutein 264.8 to 367.1 91.8 to 92.9 −34.3 to −27.9 NA [55]
SLNPs and NLCs β-carotene SLNPs 200 to 400 53.4 to 68.3 −6.1 to −9.3 90 at 5, 25, and 40 °C [56]
<220 NA 20 to 30 10 at 25 °C [57]
120 NA −30 56 at 25 °C [58]
Lycopene SLNPs 125 to 166 86.6 to 98.4 NA 60 at 4 °C [59]
Lycopene NLCs 157 to 166 > 99 −74.2 to −74.6 120 at 4, 30, and 40 °C [8]
121.9 84.50 −29 90 at 25 °C [60]
Supercritical fluid-based NPs Astaxanthin 150 to 175 NA NA NA [61]
266 84 NA NA [62]
Metal/metal oxide-based NPs and hybrid nanocomposites Carotenoids 20 to 140 NA NA NA [63]
Lycopene 3 to 5 −48.5 90 at 4 and 25 °C [64]
20.8 −25.3 NA [65]

1 EE = encapsulation efficiency, NPs = nanoparticles, SLNPs = solid lipid nanoparticles, NA = data not available and NLCs = nanostructured lipid carriers.

Table 2. The advantages and disadvantages of nanosystems for encapsulation of carotenoids 1.

Nanosystem

Advantages and Disadvantages

References

Nanoemulsions

Advantages

  • High optical clarity and enhanced physical stability

  • Small-sized particles with improved bioavailability and absorption

  • Increased solubility of lipophilic compounds

  • Rapid and efficient penetration of the compound

  • Energy efficient method

Disadvantages

  • Use of large surfactant and co-surfactant

  • Low storage and chemical stability

  • Limited solubility for high melting substances

  • Bio-toxicity of the carrier

[2][5]

Polymeric/biopolymeric NPs

Advantages

  • High stability and EE

  • Easy biodegradability and high bioavailability

  • Controlled release, drug targeting and the enhanced cellular uptake

  • Low cost

Disadvantages

  • Irritation after administration

  • Low storage stability

[3][5]

Nanoliposomes/liposomes

Advantages

  • Less toxicity

    Increased stability, efficiency and pharmacokinetic effects

Disadvantages

  • Low solubility, short half-life and low EE

  • Difficult to control size of liposomes

  • Less reproducibility

  • High cost ingredients

  • Poor resistance to gastrointestinal enzymes and at low pH

[5][9]

SLNPs

Advantages

  • High possibility to encapsulate lipophilic and hydrophilic compounds

  • No use of organic solvents

  • Easy scale-up process

  • High membrane permeability of liposomes and the ability of biopolymer NPs for controlled release

  • High bioactive absorption and easy biodegradability

  • Lack of biotoxicity

Disadvantages

  • Low EE and stability

  • Presence of others colloidal structures

  • Polymorphic transitions may result in expulsion of bioactive compounds

  • Conformational modification of the lipid NPs

[2][5][9]

NLCs

Advantages

  • High EE and stability

  • Controlled release

  • Simple preparation methods with controlled particle size

  • High possibility for scale-up

Disadvantages

  • Cytotoxic effect

  • Irritation and sensitizing action of surfactants

[2][5]

Supercritical fluid-based NPs

Advantages

  • Scalable, green, nontoxic and economical

  • Good particle size with controlled particle morphology

  • High production yield and EE

  • Homogeneous drug distribution

  • Reduced isomerization and thermal degradation of heat labile compounds

  • Solvent can be easily eliminated from food matrix

  • Minimizes harmful chemical residues

  • Low-temperature operation

  • Produces solvent-free and homogenous products

  • Single-step processing method

Disadvantages

  • Poor solubility of solutes in SCF CO2

  • Size of particles cannot be controlled

[2][9][66]

Metal/metal oxide-based NPs and hybrid nanocomposites

Advantages

  • No toxic solvent required

  • Great plasma absorption

  • Target site delivery

  • High surface area

  • Cost-effective

  • High uniformity in shape, size and branch length

Disadvantages

  • Particles instability

  • Toxic, carcinogenic and cause irritation

  • Less reproducibility of the processes

  • Low possibility for scale-up

[67][68]

1 EE = encapsulation efficiency, NPs = nanoparticles, SLNPs = solid lipid nanoparticles and NLCs = nanostructured lipid carriers.

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Bing-Huei Chen
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