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Wu G, Yang C, Lin H, Hu F, Li X, Xia S, Bruce HL, Roy BC, Huang F, Zhang C. To What Extent Do Low-Voltage Electrostatic Fields Play a Role in the Physicochemical Properties of Pork during Freezing and Storage? J Agric Food Chem 2024; 72:1721-1733. [PMID: 38206806 DOI: 10.1021/acs.jafc.3c08470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Low-voltage electrostatic fields (LVEF) are recognized as a new technology that can improve the quality of frozen meat. To determine the extent to which LVEF assistance affects the quality of frozen pork for long-term storage, pork was frozen and stored at -18 and -38 °C for up to 5 months. Water-holding capacity, muscle microstructure, and protein properties were investigated after up to 5 months of frozen storage with and without LVEF assistance. In comparison to traditional -18 and -38 °C frozen storage, LVEF treatment inhibited water migration during frozen storage and thawing. As a result, thawing losses were reduced by 15.97% (-18 °C) and 3.38% (-38 °C) in LVEF-assisted compared to conventional freezing methods. LVEF helped to maintain the muscle fiber microstructure and reduce muscle protein denaturation by miniaturizing ice crystal formation by freezing. As a result of this study, LVEF is more suitable for freezing or short-term frozen storage, while a lower temperature plays a more significant role in long-term frozen storage.
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Affiliation(s)
- Guangyu Wu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Chuan Yang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
| | - Hengxun Lin
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
| | - Feifei Hu
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
| | - Xia Li
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
| | - Shuangmei Xia
- Testing Center for Quality Supervision on Agro-Products and Foods, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
| | - Heather L Bruce
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Bimol C Roy
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Feng Huang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
- Institute of Western Agriculture, The Chinese Academy of Agricultural Sciences, Changji 831100, P. R. China
| | - Chunhui Zhang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Key Laboratory of Agro-Products Processing, Ministry of Agriculture and Rural Affairs, Beijing 100193, P. R. China
- Institute of Western Agriculture, The Chinese Academy of Agricultural Sciences, Changji 831100, P. R. China
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Miao X, Niu H, Sun M, Li D, Hua M, Wang J, Su Y. Structural Characterization and Properties of Modified Soybean Meal Protein via Solid-State Fermentation by Bacillus subtilis. Molecules 2023; 28:8015. [PMID: 38138505 PMCID: PMC10746062 DOI: 10.3390/molecules28248015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/17/2023] [Accepted: 12/05/2023] [Indexed: 12/24/2023] Open
Abstract
Soybean meal (SBM) is a high-quality vegetable protein, whose application is greatly limited due to its high molecular weight and anti-nutritional properties. The aim of this study was to modify the protein of soybean meal via solid-state fermentation of Bacillus subtilis. The fermentation conditions were optimized as, finally, the best process parameters were obtained, namely fermentation temperature of 37 °C, inoculum amount of 12%, time of 47 h, and material-liquid ratio of 1:0.58, which improved the content of acid-soluble protein. To explore the utilization of modified SBM as a food ingredient, the protein structure and properties were investigated. Compared to SBM, the protein secondary structure of fermented soybean meal (FSBM) from the optimal process decreased by 8.3% for α-helix content, increased by 3.08% for β-sheet, increased by 2.71% for β-turn, and increased by 2.51% for random coil. SDS-PAGE patterns showed that its 25-250 KDa bands appeared to be significantly attenuated, with multiple newborn peptide bands smaller than 25 KDa. The analysis of particle size and zeta potential showed that fermentation reduced the average particle size and increased the absolute value of zeta potential. It was visualized by SEM and CLSM maps that the macromolecular proteins in FSBM were broken down into fragmented pieces with a folded and porous surface structure. Fermentation increased the solubility, decreased the hydrophobicity, increased the free sulfhydryl content, decreased the antigenicity, improved the protein properties of SBM, and promoted further processing and production of FSBM as a food ingredient.
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Affiliation(s)
| | | | | | | | | | - Jinghui Wang
- Institute of Agro-Food Technology, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun 133000, China; (X.M.); (H.N.); (M.S.); (D.L.); (M.H.)
| | - Ying Su
- Institute of Agro-Food Technology, Jilin Academy of Agricultural Sciences (Northeast Agricultural Research Center of China), Changchun 133000, China; (X.M.); (H.N.); (M.S.); (D.L.); (M.H.)
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Jiang Q, Du Y, Huang S, Gu J, Shi W, Wang X, Wang Z. Physicochemical and microstructural mechanisms for quality changes in lightly salted tilapia (Oreochromis niloticus) fillets during frozen storage. J Sci Food Agric 2023; 103:308-316. [PMID: 35864589 DOI: 10.1002/jsfa.12142] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 07/18/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Frozen tilapia fillet has become a leading aquatic product. High drip loss, dry and fibrous mouthfeel, and an unappealing appearance are its main problems. It was hypothesized that light salting could improve the quality, and that the preparation conditions would affect the storage stability of frozen tilapia fillets. RESULTS The quality changes of lightly salted tilapia fillets were evaluated during frozen storage, and the underlying mechanisms were studied from the physicochemicaland microstructural perspectives. Though the salt content was 1.5% in all samples,the amount of ice crystals in frozen tissues decreased with the descending water content and freezing point (P < 0.05). No intracellular voids were observed in the samples prepared under proper salting conditions, and the myofibers were plump and smooth after freezing-thawing, which contributed to the high water-holding capacity of lightly salted fillets. After 28 days,the water-binding capacity of the salted groups was 14.69%-18.62% higher than that of their unsalted counterparts (P < 0.05). The reduced protein solubility in the salted fillets was likely to have occurred because the solubilized and unfolded proteins interacted more easily during frozen storage. The oxidation degree of myofibrillar proteins was also affected by salting condition, and the fillets with less oxidized sulfhydryl groups maintained high springiness after 28 days of frozen storage. CONCLUSION The salting condition of 9% NaCl solution for 1 h was recommended for the preparation of lightly salted fillets from freshwater fish, taking into account quality, processing efficiency, and storage stability. The enhanced water-holding capacity and texture of lightly salted tilapia fillets were attributed to modified physicochemical and microstructural properties. These results could provide a scientific basis for the processing and storage of high-quality, frozen, lightly salted fillets from freshwater fish. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Qingqing Jiang
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Yufan Du
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Shiyu Huang
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Jinhui Gu
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Wenzheng Shi
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Xichang Wang
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
| | - Zhihe Wang
- Department of Food Science and Technology, Shanghai Engineering Research Center of Aquatic Product Processing & Preservation, Shanghai Ocean University, Shanghai, China
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Ge X, Wang H, Yin M, Wang X. Effect of Different Thawing Methods on the Physicochemical Properties and Microstructure of Frozen Instant Sea Cucumber. Foods 2022; 11. [PMID: 36076802 DOI: 10.3390/foods11172616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/12/2022] [Accepted: 08/25/2022] [Indexed: 11/17/2022] Open
Abstract
To provide recommendations to users regarding which thawing method for frozen instant sea cucumbers entails lower quality losses, in this study we compared the water retention, mechanical properties, protein properties, and microstructures of frozen instant sea cucumbers post-thawing by means of different thawing approaches, including refrigerator thawing (RT), air thawing (AT), water immersion thawing (WT), and ultrasound-assisted thawing (UT). The results indicated that UT took the shortest time. RT samples exhibited the best water-holding capacity, hardness and rheological properties, followed by UT samples. The α-helix and surface hydrophobicity of WT and AT samples were significantly lower than those of the first two methods (p < 0.05). The lowest protein maximum denaturation temperature (Tmax) was obtained by means of WT. AT samples had the lowest maximum fluorescence emission wavelength (λmax). Based on these results, WT and AT were more prone to the degradation of protein thermal stability and the destruction of the protein structure. Similarly, more crimping and fractures of the samples after WT and AT were observed in the sea cucumbers’ microstructures. Overall, we observed that UT can be used to maintain the quality of frozen instant sea cucumbers in the shortest time.
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Liu S, Zeng X, Zhang Z, Long G, Lyu F, Cai Y, Liu J, Ding Y. Effects of Immersion Freezing on Ice Crystal Formation and the Protein Properties of Snakehead ( Channa argus). Foods 2020; 9:foods9040411. [PMID: 32252231 PMCID: PMC7231075 DOI: 10.3390/foods9040411] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/19/2020] [Accepted: 03/20/2020] [Indexed: 11/20/2022] Open
Abstract
This study aimed to evaluate the effect of immersion freezing (IF) at different temperatures on ice crystal formation and protein properties in fish muscle. Snakehead blocks were frozen by IF at −20, −30, and −40 °C, and conventional air freezing (AF) at −20 °C. The size of ice crystals in the frozen samples was evaluated using Image J software. Changes in protein properties were analyzed by Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). Snakehead blocks frozen using IF contained smaller ice crystals and better microstructures, especially at lower temperatures. The mean cross-sectional areas of ice crystals formed in the frozen samples were 308.8, 142.4, and 86.5 μm2 for IF treatments at −20, −30, and −40 °C, respectively, and 939.6 μm2 for the AF treatment. The FT-IR results show that protein aggregation in the frozen fish blocks was manifested by a decrease in α-helices connected to the increased random coil fraction. The DSC results show that samples prepared by IF had a higher denaturation enthalpy (∆H) and denaturation maximum temperature (Tmax) than those prepared by AF. These results confirm that IF generated a larger number of smaller ice crystals, which is conducive to food preservation.
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Affiliation(s)
- Shulai Liu
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
- Institute of Ocean Research, Zhejiang University of Technology, Jiashan Rd 33, Hangzhou 310032, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, No. 1st Qinggongyuan, Dalian 116034, China
| | - Xiaohong Zeng
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Zhenyu Zhang
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Guanyu Long
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Fei Lyu
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Yanping Cai
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Jianhua Liu
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
| | - Yuting Ding
- College of Food Science and Technology, Zhejiang University of Technology, Chaowang Rd 18, Hangzhou 310014, China; (S.L.); (X.Z.); (Z.Z.); (G.L.); (F.L.); (Y.C.); (J.L.)
- National R & D Branch Center for Pelagic Aquatic Products Processing (Hangzhou), Hangzhou 310014, China
- Institute of Ocean Research, Zhejiang University of Technology, Jiashan Rd 33, Hangzhou 310032, China
- Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, No. 1st Qinggongyuan, Dalian 116034, China
- Correspondence: ; Tel.: +86-571-88320237
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Katuwawala A, Oldfield CJ, Kurgan L. DISOselect: Disorder predictor selection at the protein level. Protein Sci 2020; 29:184-200. [PMID: 31642118 PMCID: PMC6933862 DOI: 10.1002/pro.3756] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/16/2019] [Accepted: 10/17/2019] [Indexed: 12/27/2022]
Abstract
The intense interest in the intrinsically disordered proteins in the life science community, together with the remarkable advancements in predictive technologies, have given rise to the development of a large number of computational predictors of intrinsic disorder from protein sequence. While the growing number of predictors is a positive trend, we have observed a considerable difference in predictive quality among predictors for individual proteins. Furthermore, variable predictor performance is often inconsistent between predictors for different proteins, and the predictor that shows the best predictive performance depends on the unique properties of each protein sequence. We propose a computational approach, DISOselect, to estimate the predictive performance of 12 selected predictors for individual proteins based on their unique sequence-derived properties. This estimation informs the users about the expected predictive quality for a selected disorder predictor and can be used to recommend methods that are likely to provide the best quality predictions. Our solution does not depend on the results of any disorder predictor; the estimations are made based solely on the protein sequence. Our solution significantly improves predictive performance, as judged with a test set of 1,000 proteins, when compared to other alternatives. We have empirically shown that by using the recommended methods the overall predictive performance for a given set of proteins can be improved by a statistically significant margin. DISOselect is freely available for non-commercial users through the webserver at http://biomine.cs.vcu.edu/servers/DISOselect/.
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Affiliation(s)
- Akila Katuwawala
- Department of Computer ScienceVirginia Commonwealth UniversityRichmondVirginia
| | | | - Lukasz Kurgan
- Department of Computer ScienceVirginia Commonwealth UniversityRichmondVirginia
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Jin Q, Hu X, Li X, Wang B, Wang Y, Jiang H, Mattson N, Xu Y. Genome-Wide Identification and Evolution Analysis of Trehalose-6-Phosphate Synthase Gene Family in Nelumbo nucifera. Front Plant Sci 2016; 7:1445. [PMID: 27746792 PMCID: PMC5040708 DOI: 10.3389/fpls.2016.01445] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 09/09/2016] [Indexed: 05/24/2023]
Abstract
Trehalose-6-phosphate synthase (TPS) plays a key role in plant carbohydrate metabolism and the perception of carbohydrate availability. In the present work, the publicly available Nelumbo nucifera (lotus) genome sequence database was analyzed which led to identification of nine lotus TPS genes (NnTPS). It was found that at least two introns are included in the coding sequences of NnTPS genes. When the motif compositions were analyzed we found that NnTPS generally shared the similar motifs, implying that they have similar functions. The dN /dS ratios were always less than 1 for different domains and regions outside domains, suggesting purifying selection on the lotus TPS gene family. The regions outside TPS domain evolved relatively faster than NnTPS domains. A phylogenetic tree was constructed using all predicted coding sequences of lotus TPS genes, together with those from Arabidopsis, poplar, soybean, and rice. The result indicated that those TPS genes could be clearly divided into two main subfamilies (I-II), where each subfamily could be further divided into 2 (I) and 5 (II) subgroups. Analyses of divergence and adaptive evolution show that purifying selection may have been the main force driving evolution of plant TPS genes. Some of the critical sites that contributed to divergence may have been under positive selection. Transcriptome data analysis revealed that most NnTPS genes were predominantly expressed in sink tissues. Expression pattern of NnTPS genes under copper and submergence stress indicated that NNU_014679 and NNU_022788 might play important roles in lotus energy metabolism and participate in stress response. Our results can facilitate further functional studies of TPS genes in lotus.
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Affiliation(s)
- Qijiang Jin
- College of Horticulture, Nanjing Agricultural UniversityNanjing, China
| | - Xin Hu
- College of Horticulture, Nanjing Agricultural UniversityNanjing, China
| | - Xin Li
- Leisure Agricultural Section, Institute of Agricultural Science of Taihu Lake DistrictSuzhou, China
| | - Bei Wang
- College of Horticulture, Nanjing Agricultural UniversityNanjing, China
| | - Yanjie Wang
- College of Horticulture, Nanjing Agricultural UniversityNanjing, China
| | - Hongwei Jiang
- Leisure Agricultural Section, Institute of Agricultural Science of Taihu Lake DistrictSuzhou, China
| | - Neil Mattson
- Horticulture Section, School of Integrative Plant Science, Cornell UniversityIthaca, NY, USA
| | - Yingchun Xu
- College of Horticulture, Nanjing Agricultural UniversityNanjing, China
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