Fish Protein-Based Gel Products: Comparison
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Texture is an important parameter in determining the quality characteristics and consumer acceptability of seafood and fish protein-based products. The quality of protein gel used in food development depends on its functional and nutritional properties. The number of commercial gel products is growing with the use of different additives, such as monosaccharides, oligosaccharides, polysaccharides and protein-based hydrolysates. The addition of such additives has improved the gelling properties of surimi gel in different ways: (a) by preventing the protein oxidation, denaturation and aggregation; (b) by improving the intermolecular binding interactions; (c) by enhancing the amino acids cross-linking and (d) reducing the amount of free water molecules during processing and preservation.

  • surimi
  • additives
  • textural properties

1. Introduction

The quality of protein gel used in food development depends on its functional and nutritional properties. In recent decades, there has been a growing need for protein-based products among individuals due to the increasing population [1]. Scientists are looking for food-based additives and advanced processing techniques to enhance the quality, structure, oxidation and textural attributes of surimi gel products [2,3][2][3]. With regard to food textures, it takes a profound understanding of the elements that can interface with one another and how these interactions enhance the functional and structural attributes [4,5][4][5]. The texture of meat-based products is an important sensory feature regarding consumer product assessment. Over the past few decades, there has been increasing scientific interest in the field of surimi gel characteristics, such as functional, structural and textural properties. The principal goal of studying food texture is either to enhance the texture or to develop gel products with a special texture to satisfy the needs of particular classes, such as individuals who have difficulties in eating common food items [6]. In addition, a decline in textural properties predicts the degree of oxidation in surimi and surimi-based products. Fish-based gel products are generally made from minced or cut muscle with or without added ingredients, such as snacks, sausages and kamboka gel in the seafood industry. Surimi-based gel products may have imitation appearances that indicate high value and consumer acceptability. The physical and chemical properties of surimi gel can be regulated by interactions of protein molecules and stability during processing [7].
The number of commercial gel products is growing with the use of different additives, such as monosaccharides, oligosaccharides, polysaccharides and protein-based hydrolysates. The addition of such additives has improved the gelling properties of surimi gel in different ways: (a) by preventing the protein oxidation, denaturation and aggregation; (b) by improving the intermolecular binding interactions; (c) by enhancing the amino acids cross-linking and (d) reducing the amount of free water molecules during processing and preservation [8]. Meanwhile, researchers are now focusing on the addition of novel and effective additives with modern process techniques to improve the surimi gel functional and gelling properties during processing and preservation compared to conventional methods. However, these conventional technologies are not time, cost and quality efficient to develop proper surimi gel, thus suggesting the use of modern processing techniques.

2. Fish Protein-Based Gel Products

2.1. Heat-Induced Gel

A number of publications on surimi thermal gelation are available. Surimi gelation is the most popular method in the seafood industry for gelling products. Surimi gelation involves myofibrillar proteins (MPs), particularly myosin. It occurs when enough salt is added to allow MPs to unfold, which causes the exposure of their reactive sites, encouraging contact, so that intermolecular bonds are formed. When such interactions are sufficient, a three-dimensional network is developed, which leads to gel formation. Various bonds, such as hydrophobic, covalent hydrogen and ionic interactions are important in the formation of dense and three-dimensional gel networks [2,18][2][9]. It is imperative to ensure that covalent and hydrophobic bindings are responsible for gel thermos stability, which is important for gel formation. If surimi is held at a low temperature (0 to 50 °C following salting), MPs can develop a more reconfigurable and softer gel network, known as suwari gel; this process is called suwari. This kind of gel is generally produced by the enzymatically catalyzed effect of transglutaminase (mTGase), which is naturally occurring in fish muscles [19][10]. The temperature at which proteins are unfolded and connected all depends on the species. Better results were obtained in cold-water fish at a temperature of approximately 25 °C, while suwari gels made with a water bath showed better mechanical properties when incubated at a temperature higher than 40 °C [20][11]. An alternative means of developing suwari is through high-pressure denaturation of protein, in which case a gel with a shinier texture is obtained. Hydrophobic interactions play a predominant role in such conditions. After heating suwari gels at 80–90 °C, stronger gels formed, while pre-incubation was performed at low temperatures [21][12].
A variety of ingredients and additives have been used to improve the gel texture during gelation. These ingredients can function either as protein interactors or as protein network fillers [2]. Moreover, advanced techniques (ohmic, MW and HPP) have been reported on for the heat gelation of surimi gel and preferred over the conventional techniques in literature [22,23][13][14]. The goal of such research findings was to decrease proteolytic activity and its negative impact during slow heating. Moon, et al. [24][15] noted that Alaska Pollock surimi gels cooked at slow ohmic heating showed increased shear stress and strain values, while Pacific surimi whiting, which has a more proteolytically active effect, showed higher levels of shear stress when heated rapidly. Two Japanese producers have commercially introduced the ohmic cooking technique for surimi gel preparation [25][16]. Gao, et al. [26][17] found that the rapid heating of low salt surimi from Hypophthamichthys molitrix mince during gelation prevented the protein autolysis and contributed to a superior gel strength and texture relative to traditional heat gelation. Gelation using radio frequency (RF) is a dielectric heat equivalent to processing with a MW. Helena, et al. [19,27][10][18] studied its use in gel products. These researchers demonstrated that RF heated surimi gel showed better water holding capacity (WHC) properties along with compact structure, but was considerably harder and chewier with a lower development of color than the steam cooked method. Sampels [28][19] reported increased water binding and gel strength of RF and MW during Atlantic salmon and Rainbow trout surimi gel. The fracture and deformation values in puncture experiments were higher when RF was being used as compared to MW when heating at varying temperatures. Furthermore, no commercial RF or MW is still available on a continuous basis.

2.2. Cold Gelation

In recent decades, the demand for moderately processed products has grown. In this regard, the advancement of cold gelation technology is becoming an important choice in producing surimi gel products. Products produced by this process are highly flexible and can be sold in a number of ways, including ready-to-serve fish fillets, small fillets, marinated, carpaccio-like sushiors and even smoked products [19][10]. There are different types of binding agents, such as alginates and mTGase available in the food industry that make surimi-based gels, possibly using cold gelation technology. In cold gelation, the aggregation of proteins is primarily due to the activity of various bindings capable of acting at low temperatures without altering the aspects of the gel formation [29][20]. In addition, it is also possible to produce different value-added gel products by using these bonding agents [2]. Alginate and Transglutaminase—two binding additives—improve the gelling and functional properties of gel products by enhancing cross-linking in amino acid side chains. However, scientific literature has recently recommended the inclusion of konjac glucomannan (KGM) into surimi to allow the gel to be made from non-functional raw material.

2.3. Salt-Based Surimi Gel

The desired surimi gel can be acquired by adding various salts, usually, sodium chloride (NaCl), which aid in unfolding MPs during the gelation phase [30][21]. Currently, salt in surimi is becoming an important concern, since decreased salt levels have reduced MP solubilization and thereby contributed to weak surimi gel [31,32][22][23]. Different salts, such as Na+, Mg2+, K+ and Ca2+, have been stated to be alternatives to each other but often contain unacceptable flavors [33][24]. Li, et al. [34][25] stated that MPs dissolved in 2–4 g/100 g of NaCl to develop a proper gel network. In comparison, additional additives in conjunction with HPP and reduced addition of sodium chloride would also contribute to physicochemical properties close to normal surimi gel as after the addition of normal salt amount.

53. Role of Modern Technologies in Protein Gel-Based Products

5.1. High-Pressure Processing

3.1. High-Pressure Processing

High-pressure processing (HPP) is an enticing technology for preserving food with the possibility of controlling microbe load and/or enzyme production in various products [13,88,89,90][26][27][28][29]. HPP is an adjunction approach to stimulate the protein gelation phase in a properly solubilized form. Molecular interactions by additional hydrophobic and hydrogen bonds and distributional interactions, such as disulfide bindings could stabilize the established strong protein gel network [17][30]. HPP could be used to boost protein functionality and easily change enzyme activity. The influence of HPP on additives and the versatility of surimi gel has been more widely studied than any other advanced developments in food processing, such as ohmic heating, MW, ultrasonication and UV light. The majority of these studies have focused on the gel development of chicken, pork plasma, surimi and turkey meat [15][31]. A primary consistency index for protein gel products, the WHC, is strongly influenced by the quantity of free and trapped water [91][32].
HPP also prevents oxidative changes in seafood and other meat products to maintain their textural and nutritional properties. Pork was stored for 8 days at 2 °C after the HPP application. At the end Nof the study, no s significant formation of lipid oxidation was analyzed. On the other hand, HPP also prevented oxidative changes by increasing the sulfhydryl content and inhibited the formation of carbonyls, which resulted in better textural properties [5]. Morton, et al. [92][33] also reported that HPP significantly reduced the oxidative changes in beef, in which the oxidative changes were more stable as compared to chicken meat. Cava, et al. [93][34] stated that the application of HPP treatment (200 to 300 MPa) enhanced the stability of lipid and protein oxidation in dry-cured meat after storage for 90 days at 4 °C.
Moreover, depending on the operating environment, protein source, protein stability rate and gelling conditions, HPP may induce positive or negative effects on the textural properties of surimi gel [22,23][13][14]. Important improvements were recorded in gel strength and WHC using HPP on mTGase-based gel for chicken meat [13][26] and tilapia surimi paste [94][35]. HPP substantially organizes protein molecules by inhibiting the oxidative changes to increase the WHC by forming hydrophobic associations and hydrogen and disulfide bindings [95][36]. Tsevdou, et al. [96][37] reported that the HPP at 450 MPa on casein micelles in the presence of mTGase improved the textural properties of surimi gel by creating a low-porosity protein matrix, the mTGase crosslinking of small micelles reduced the syneresis rate. Moreover, the hydrolysis of covalent bonds (e.g., disulfide, hydrogen, ionic and hydrophobic) can increase the solubility of protein gels. The presence of mTGases can decrease the net protein solubility due to HPP. Tabilo-Munizaga and Barbosa-Cánovas [97][38] reported that the addition of potato starch and egg white protein in surimi at 400 MPa of HPP improved the whiteness and textural attributes of surimi gel to 602 (g) as compared to 483 (g) in control.
This is a reality that insoluble aggregates have been formed by having clear ties between heavy myosin protein chains [94][35]. The breaking force is improved substantially at the same time as HPP and EW are being added [19][10]. The stability of protein gels improved by HPP processing is not only due to the increasing amount of protein stretching and the number of structures, but also reduced oxidative changes, the visibility of glutamyl and lysyl residues and the formation of isopeptide bonds of enzymes [98][39]. Tabilo-Munizaga and Barbosa-Canovas [99][40] stated that the surimi gel showed better textural and WHC properties after the addition of non-ionic gum in surimi during HPP processing. Furthermore, at 200 MPa, surimi gel with kappa carrageenan demonstrated improved textural and microstructural properties [100][41].

5.2. Ultrasonication

3.2. Ultrasonication

Ultrasonication is a valuable technique and has diverse applications in food items, such as mechanical cell distortions in order to enhance the retrieval of bioactive components, micro-organism inactivation and immiscible liquid emulsification [15,101,102][31][42][43]. Recently, low frequency (16–100 kHz), high frequency (HIU, 10–1000 Wcm−2) ultrasonic techniques have been developed as a fast and secure application to alter protein structures, functional and physicochemical properties [103][44]. Most importantly, ultrasonication is widely encouraged by researchers to enhance food quality. Ultrasonic techniques have special characteristics that make them more effective, such as microstreaming currents, turbulence, high pressure, cavitation bubbling, leading to modification of protein structural properties [104][45]. Gülseren, et al. [105][46] reported that adding phenolic compounds to proteins and treating them with ultrasonic techniques could reduce protein cross-linking and oxidation, both of which play important roles in the gelling and textural properties of seafood proteins. He, et al. [106][47] reported that the application of ultrasonication combined with high salt concentration enhanced the textural properties (hardness and springiness) of silver carp surimi. Meanwhile, it prevented the change in secondary structural changes by inhibiting the unfolding of α-helix content. Pan, et al. [107][48] reported that the addition of phenolic compounds to MPs and treatment with ultrasonication reduced the protein oxidation (surface hydrophobicity and carbonyls) by enhancing the hydrogen and hydrophobic interactions. A big rise in the yield of soy protein isolate (SPI) catalyzed by mTGases led to an improvement in WHC and textural properties after the ultrasonication technique. Therefore, ultrasonication is also helpful in raising the SPI and wheat gluten-based hydrogels by assisting in protein structural modifications [108][49]. Xu, Lv, Zhao, He, Li, Yi and Li [104][45] reported that the ultrasound treatment with diacylglycerol (DAG) enhanced the gelling attributes of golden thread surimi. In addition, ultrasound combined with (DAG) improved the structural and microstructural properties of golden thread surimi by enhancing the intermolecular interaction, hydrogen and hydrophilic bindings. The use of short-term sonication speeds up water leakage rates because of the existence of poor structural matrix protein gels [109][50]. In addition, the production of low-porosity, homogenous protein structures for water absorption at higher sonic times can be related to two distinct mechanisms, including: (I) an exposition through modifications in the molecular conformation of proteins to internal active polar groups on the surface and (ii) a more fitting dispersion of these functionary groups into a sonic reaction environment [103][44]. It has previously been observed that high-intensity ultrasonic treatment could enhance the gel strength of SPI-set gels caused by adding glucono-β-lactone [110][51] and calcium sulfate [111][52]. Gao, et al. [112][53] reported that the polysaccharide-added surimi protein had higher Ca2+ATPase and sulfhydryl content after ultrasonication, which reduced oxidative changes in the myosin globular head by stimulating hydrogen and hydrophobic interactions. Thus, this results in a more stable gel texture and structure. Ultrasonic application appears to alter the function of the protein matrix by expanding the amount of interfacial covalent interactions. Typically, hydrophobic associations in the protein gel matrix are intensified following ultrasonication [110][51]. Hu, et al. [113][54] have demonstrated that the secondary SPI textural properties of mTGase-based gels were not altered at 20 kHz and 400 W of ultrasonic treatment. However, Gharibzahedi, Roohinejad, George, Barba, Greiner, Barbosa-Cánovas and Mallikarjunan [13][26] reported modifications of the secondary structure of the wheat gluten-SPI gels caused by ultrasonic technique, leading to increased β-sheets, decreased α-helices and β-turns, which indicates fewer protein oxidative, denaturation and aggregation changes. Cui, et al. [114][55] have identified an increase in β sheet count to boost the hydrophobic surface and viscoelastic properties of protein gels. The enhanced configurations of the β-sheets also modified the protein-protein cross-linking of hydrophobic active groups. β-sheets are more capable of hydrating water molecules compared to α-helix during ultrasonic pretreatment and it provides stronger hydrogels [113][54]. Ultrasonication can transform the molecular protein structure from β-turns into random coils in order to improve the cross-linkage of amino acid side chains [15][31]. Therefore, the larger amount of inter-molecular disulfide bonds in ultrasonic-based surimi gels can also justify the rise in gel strength. The appearance of a polymer matrix with more compact and dense aggregations of multi-molecular cross-links, hydrophobic associations and inter-molecular disulfide bindings, increases the gel strength [115][56]. The microstructure of heat-induced gels, however, can be dramatically altered with increasing ultrasonic time and cavitational pressure, from a spongy matrix with wider irregular pores, to a more dense and homogeneous alveolar network with fewer pores by reducing myosin oxidative changes as well as enhancing the intermolecular bonding interactions [116][57].
Qin et al. [108][49] took a particular approach to explain why the increased ultrasonic approach enhanced the wheat gluten added gel. They observed that the non-covalent interactions in the gluten structure (e.g., hydrogen bonds) were attenuated by the partial expression of protein molecules. The spatial structure of gluten reportedly promotes gel strength by creating novel and different linkages/relationships in the molecular structure, particularly covalent cross-links of inter-(μ-glutamine)-lysine. The use of Na2SO3/ultrasonic pretreatment increased the power of wheat gluten gel by up to 67% of the different pretreatments (e.g., alkaline, urea and Na2SO3) coupled with ultrasonication [117][58]. The use of ultrasonic treatment generally results in higher protein solubility in various solvents, particularly over long periods of time. Ultrasonication increases the sum of electrostatic bonds and other non-covalent connections compared with covalent interactions in protein gel structure. This decreases the molecular weight and increases the solubility rate by hydrolyzing disulfide bonds by adding Na2SO3 into the reaction mixture [111][52]. Under certain circumstances, the dispersion of protein molecules on the aqueous surface allows exposure of specific functional groups by the cavitation phenomenon during the ultrasonic application [118,119][59][60].

5.3. Microwave (MW)

3.3. Microwave (MW)

Microwave (MW) heating has been reported as a non-conventional way of heating surimi gel, which generally focuses on the MW radiation effect on protein functional and structural attributes. Jiao, Cao, Fan, Huang, Zhao, Yan, Zhou, Zhang, Ye and Zhang [3] reported that the MW heating protected proteins from oxidation, denaturing and aggregation during processing and preservation. MW heating proved to be effective against these changes in contrast with thermal hot water treatment. Feng, et al. [120][61] examined the effects of both water bath and MW heating on silver carp protein, which showed that the MW heating showed better stability in Ca2+ATPase activity and protein solubility than the proteins heated at water bath, which indicates less myosin exposure to oxidative changes and resulting denaturation. These inhibited changes also have a potential role in enhancing the gelling and textural abilities of the final product. Moreover, MW is a type of electromagnetic radiation with a frequency between 300 Hz to 300 GHz and a wavelength of around 1 cm and 1 mm. The polarization of water in food materials with MW high-frequency radiation will unfold protein molecules, breaking down non-covalent bindings, including disulfide connectivity and hydrogen bonding [22,121][13][62]. Cao, Fan, Jiao, Huang, Zhao, Yan, Zhou, Zhang, Ye and Zhang [47][63] stated that MW radiation could improve the efficiency and reaction rate of enzyme systems in a certain range of radiation frequencies. Qin, Luo, Cai, Zhong, Jiang, Zhao and Zheng [108][49] have examined the impact of MW on the gelation process of mTGase added SPI. The increase in MW power up to 700 W decreased the solubility index, gel strength, elasticity, hardness and WHC of the proteins treated with mTGase. In contrast to untreated samples, thicker, more consistent mTGase-catalytic gels with more α-helices and β-turns and fewer portions of β-sheets were given at a constant frequency (3 GHz). The protein solubility decrease in MW treated samples was due to a reduction in the free SH content of protein gels caused by mTGase. In addition, due to the effect on hydrogen, intermolecular disulfide bonds, as well as electrostatic and hydrophobic interactions a significant number of insoluble protein aggregates can limit the solubility of proteins. Protein aggregates generally form due to oxidative changes and weaker intermolecular bonding interactions. In addition, MW heating also enhanced the stability of SH content by preventing the unfolding of amino acids caused by oxidative and aggregation changes [120][61]. The accumulation of these insoluble aggregates of greater particle size could decrease the potential of the water to associate with protein molecules [122][64].
The formation in MW-treated protein gels of a stable and solid well-aggregated microstructure with reduced particle size may be attributed to electrical polarization and the insoluble aggregation of proteins. The presence of this compact microstructure in surimi gels with increased gel strength and elasticity can validate improved textural properties, especially at increased MW capability [123][65]. Ji, et al. [124][66] reported that the surimi gel heated for 10 min at MW increased the breaking strength and gel firmness. As a result, it can be suggested that the surimi gelation at MW could increase the functional, microstructural and textural strength of the gel resulting from proper cross-linking of protein molecules. Thus, the resulting gel has better deformation and breaking strength as compared to the conventional gelation process. Protein behavior of surimi gel prepared with non-conventional and conventional techniques shown in Figure 21. On the other hand, MW heating not only enhances the gelling attributes but also reduces the protein matrix. The MW consistent heating system could not result in a defective gel as in the conventional heating system temperature above boiling point increases water vapor pressure, resulting in a gel with structural defects [125,126][67][68]. Besides that, the addition of konjac glucomannan (KGM) may improve the gel texture and structure by restricting the decline in protein secondary and tertiary structural properties induced during MW heating. It can also be interpreted that the addition of KGM improves the cross-linking of amino acids and reduces the MP polymerization [127][69]. Therefore, KGM during MW heating not only acts as a filler but is also effective in protein cross-linking and interlinking.
Figure 21. Surimi gel prepared with non-conventional and conventional techniques. Non-conventional techniques show a more stable and well-established gel network than conventional processing equipment.

5.4. Ultraviolet

3.4. Ultraviolet

Ultraviolet (UV) light irradiation can alter the protein structure by increasing the polymerization of protein side chains. The nature of the protein and the rate of irradiation are thought to be the two most important factors influencing the formation of cross-linking aggregates or molecular structures induced by protein denaturation and oxidation during this process [128,129][70][71]. Synergistic activity between the mTGase increased the surimi gel power of minced mackerel [13][26]. The mechanism behind the UV irradiation is that increases the hydrophobic interactions as compared to conventional heating, which indicates less protein denaturation (oxidation and aggregation) [129][71]. Besides that, UV irradiation also gears up the formation of disulfide content induced during protein changes, but the formation of disulfide bonds during the UV process is less than the conventional heating methods [130][72]. The UV irradiation process is consistent with stability in sulfhydryl content in fish sausage due to less irradiation-induced oxidation [131][73]. Along with polysaccharides, UV could lead to better gel hardness, compactness and three-dimensional networks of surimi gel in comparison with control gel due to fewer increases in carbonyls and surface hydrophobicity. However, the use of UV for 20 min boosted gel intensity by 20% compared to the traditional gelation process [132][74]. It can be concluded that UV light may strengthen the crosslinking of existing myosin chains in the actomyosin of surimi structure [132][74]. However, due to the high UV light sensitivity of cysteine in the myosin, an excessive increase in treatment time would dramatically reduce the gelling performance [129][71]. Cardoso, Mendes, Vaz-Pires and Nunes [116][57] have investigated the impact of simultaneous addition of konjac flour (1%) and 40 min UV radiation at 250 nm, which increased the texture and surimi gel strength. The application of UV light with konjac flour produced maximum gel strength (63.2 N mm) and springiness (0.84), with the increased WHC. This study indicates that the use of UV alone may not have a substantial effect on the texture consistency of prepared protein gels.

5.5. Ohmic Heating

3.5. Ohmic Heating

Ohmic heating is a technique in which alternating electric current passes through a food mixture. The food materials serve as resistors and their temperature is increased based on the Joule effect. The food materials serve as resistors and their temperatures vary due to the resulting air currents [133][75]. An increase in temperature can influence the micro- and macro-structure and lead to certain phenomena such as water movement, protein coagulation and starch gelatinization. Meanwhile, the use of ohmic heating also prevents the activation of polyphenoloxidase and lipoxygenase, which are responsible for oxidative changes. Surimi added with egg white and treated with ohmic heating significantly reduced the protolysis compared to the water bath heating system. In addition, ohmic heating also increased the stability of cysteine, which is a key part of myosin and responsible for oxidative changes [134][76]. Moreover, the application of ohmic heating to the surimi gel also significantly reduced the formation of disulfide bonds and resulted in an increase in total sulfhydryl content, which indicates the decline in the proteolysis process and results in proper MP interactions and gel formation [135][77].
It is also a constructive aim to take the non-thermal impacts of ohmic applications into account, particularly when an alternating current is applied to food materials [136][78]. While it is well known that ohmic heating effects on the textural and structural properties of food items have been observed, it depends on the characteristics of the food and the conditions of the process, including the process temperature, applied voltage and frequency [129,137][71][79].
Kulawik [138][80] investigated the textural and structural consistency of salt-added salmon gel using an ohmic treatment. Based on the findings by Tadpitchayangkoon, Park and Yongsawatdigul [135][77], ohmic heating at 45 °C for 5 min before salting slightly improved the product appearance and quality. Another study demonstrated that ohmic heating at 90 °C with 60 Hz and 9 V/cm resulted in increased maximal cutting strength of surimi gel (15.6 N) as compared to the traditional heating system (20.4 N). The study showed that the lower temperature processing of surimi gel resulted in less denaturation and oxidation of the MPs in the various fish species [139][81]. The textural characteristics of the thawed fish are found to be similar to those of fresh tilapia [140][82]. One of the reasons this technology is considered superior to conventional ones is because of its better influence on surimi textural properties. A benefit of ohmic heating is that it will make the process of heating spread equally across the sample [141][83]. Poor consistency or gel strength of fish can be obtained from an insufficient heating rate in traditional and slower heating methods [136][78]. Traditional processing with slow water bath cooking resulted in poor quality surimi gel, while ohmic heating of surimi improved the quality of the gel matrix, texture and strength significantly [139][81].
This research enlightened the value of ohmic application in improving the textural consistency of gel products. In addition, ohmic heating increased the textural attributes such as hardness, springiness and gumminess of Japanese whiting surimi gel at different temperatures (3, 60 and 160 °C/min), which developed a harder and more compact gel. It is obvious that the ohmic heating system provides better results relative to conventional water bath heating [142][84]. [Chai and Park [143][85]] reported that variations in time-temperature combinations and heating were the primary factors in varied textural properties during ohmic and water bath processed gel products. The applied voltage and product formulation were shown to be effective parameters to analyze the gel strength. Moreover, the role of modern processing technologies in enhanced textural properties of surimi gel is shown in Table 21. It can be concluded from the current literature that ohmic heating could be effectively used to enhance the textural and functional properties of fish and seafood gel products.
Table 21.
 Role of modern processing techniques on enhanced textural properties of surimi gel.
Processing Technique Additives Role Results Reference
HPP Kappa-carrageenan (KC) Oligosaccharids, antioxidants and cryoprotectants Surimi gel treated with KC showed better WHC and gel strength on HPP (300 MPa), by improving the water state and structural properties. [53][86]
HPP mTGase Microbial The mTGase treated surimi gel showed increased fracture stress, strain and gel strength when cooked at 300 MPa processing. [144][87]
Ultrasonication Soybean polysaccharide (SSPS) Polysaccharide, antioxidants, funtional and gelling The SSPS added surimi gel revealed enhanced whiteness and gelling properties during frozen storage combined with ultrasonication. [112][53]
Ultrasonication Wheat gluten (WG) Protien additive, functional and gelling Wheat gluten-SPI gels with ultrasonication led to increase in textural properties by improving β-sheets, decreased α-helices and β-turns. [13][26]
Microwave NaCl Functional and mechanical The mechanical, structural and textural characteristics of NaCl-treated surimi gel improved after 80 s heating of MW (15 W/g). [145][88]
Microwave Konjac glucomannan (KGM) Oligosaccharide, antioxidant and functional Microwave heated KGM surimi gel displayed better starching of protein molecules and dense KGM-protein network. [124][66]
Ultraviolet Konjac flour (KF) Dietary fiber, gelling KF (1%) and 250 nm UV for 40 min increased the gel hardness (63.2 N) and springiness (0.84). [116][57]
Ohmic heating Corn starch (CS) Carbohydrate, functional and thermo-stable CS-surimi gel displayed inferior gel network due to starch gelatinization. But the control surimi gel exhibited improved hardness and gel strength when processed with ohmic technique as compared to water bath cooked gel. [142][84]
Ohmic heating Diced carrot (DC) Sensory and functional DC added surimi of Pacific whiting (PW) and Alaska Pollock (AP) reported increased hardness and cohesiveness when ohmically heated at 90 °C. [24][15]

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