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Li Y, Ding J, Dong L, Sun N, Lin S. Mechanism of Targeted Regulation of Ovalbumin Epitopes by Pulsed Electric Field-Assisted Alcalase Treatment. J Agric Food Chem 2023. [PMID: 37389912 DOI: 10.1021/acs.jafc.3c02675] [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] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
Egg is one of the eight major food allergens, and ovalbumin (OVA) is the most abundant allergenic protein in eggs. In this study, the effects of pulsed electric field (PEF)-assisted Alcalase hydrolysis on the spatial conformation and potential allergenicity of OVA were studied, and the mechanism of its inhibiting allergic reactions effect was revealed. PEF-assisted Alcalase hydrolysis increased the degree of hydrolysis, surface hydrophobicity, and free sulfhydryl group content. Moreover, the reduction in the α-helix content, fluorescence intensity, and disulfide bond content suggested that PEF promoted the OVA hydrolysis by Alcalase. Additionally, enzyme-linked immunosorbent assay data indicated that PEF-assisted Alcalase hydrolysis hindered OVA binding to immunoglobulins E and G1. Finally, based on bioinformatics combined with mass spectrometry, PEF-assisted Alcalase reduced OVA-induced allergic reactions by destroying epitopes in OVA. Overall, PEF technology further destroyed the epitopes of allergens by targeting the binding sites of substrates and enzymes to improve the affinity of enzymes and substrates, reducing allergic reactions.
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Affiliation(s)
- Yinli Li
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Jie Ding
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Liu Dong
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Na Sun
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
| | - Songyi Lin
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
- Liaoning Engineering Research Center of Special Dietary Food, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, P. R. China
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Gao D, Li R, Chen X, Chen C, Wang C, Zhang B, Li M, Shang X, Yu X, Gong S, Pauporté T, Yang H, Ding L, Tang J, Chen J. Managing Interfacial Defects and Carriers by Synergistic Modulation of Functional Groups and Spatial Conformation for High-Performance Perovskite Photovoltaics Based on Vacuum Flash Method. Adv Mater 2023; 35:e2301028. [PMID: 37026996 DOI: 10.1002/adma.202301028] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/03/2023] [Indexed: 06/09/2023]
Abstract
Interfacial nonradiative recombination loss is a huge barrier to advance the photovoltaic performance. Here, one effective interfacial defect and carrier dynamics management strategy by synergistic modulation of functional groups and spatial conformation of ammonium salt molecules is proposed. The surface treatment with 3-ammonium propionic acid iodide (3-APAI) does not form 2D perovskite passivation layer while the propylammonium ions and 5-aminopentanoic acid hydroiodide post-treatment lead to the formation of 2D perovskite passivation layers. Due to appropriate alkyl chain length, theoretical and experimental results manifest that COOH and NH3 + groups in 3-APAI molecules can form coordination bonding with undercoordinated Pb2+ and ionic bonding and hydrogen bonding with octahedron PbI6 4- , respectively, which makes both groups be simultaneously firmly anchored on the surface of perovskite films. This will strengthen defect passivation effect and improve interfacial carrier transport and transfer. The synergistic effect of functional groups and spatial conformation confers 3-APAI better defect passivation effect than 2D perovskite layers. The 3-APAI-modified device based on vacuum flash technology achieves an alluring peak efficiency of 24.72% (certified 23.68%), which is among highly efficient devices fabricated without antisolvents. Furthermore, the encapsulated 3-APAI-modified device degrades by less than 4% after 1400 h of continuous one sun illumination.
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Affiliation(s)
- Deyu Gao
- Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering, Macau University of Science and Technology, Taipa, Macao, SAR, 999078, P. R. China
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China
| | - Ru Li
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Xihan Chen
- SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Cong Chen
- Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering, Macau University of Science and Technology, Taipa, Macao, SAR, 999078, P. R. China
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China
| | - Chenglin Wang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China
| | - Boxue Zhang
- Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), UMR8247, 11 rue P. et M. Curie, F-75005, Paris, France
| | - Mengjia Li
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China
| | - Xueni Shang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300401, P. R. China
| | - Xuemeng Yu
- SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Shaokuan Gong
- SUSTech Energy Institute for Carbon Neutrality, Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, 518055, P. R. China
| | - Thierry Pauporté
- Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche de Chimie Paris (IRCP), UMR8247, 11 rue P. et M. Curie, F-75005, Paris, France
| | - Hua Yang
- Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Liming Ding
- Institute of High Energy Physics, Chinese Academy of Sciences (CAS), Beijing, 100049, P. R. China
| | - JianXin Tang
- Macao Institute of Materials Science and Engineering (MIMSE), Faculty of Innovation Engineering, Macau University of Science and Technology, Taipa, Macao, SAR, 999078, P. R. China
- Collaborative Innovation Center of Suzhou Nano Science & Technology, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, 215123, P. R. China
| | - Jiangzhao Chen
- Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, P. R. China
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Li Y, Ding J, Zhang S, Dong L, Bao Z, Lin S. Pulsed Electric Field-Assisted Alcalase Treatment Reduces the Allergenicity and Eliminates the Antigenic Epitopes of Ovomucoid. J Agric Food Chem 2023; 71:3424-3432. [PMID: 36786733 DOI: 10.1021/acs.jafc.2c07824] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Physically assisted chemical modifications can effectively reduce the allergenicity of ovomucoid (OVM). However, only a few studies have used pulsed electric field (PEF)-assisted alcalase hydrolysis to reduce the allergenicity of OVM. Herein, we investigated the effect of PEF-assisted alcalase treatment on the spatial conformation, allergenicity, and antigenic epitopes of OVM based on multispectroscopic analyses, bioinformatics, and mass spectrometry. The results showed that PEF-assisted alcalase treatment promoted the hydrolysis of OVM; moreover, the α-helix content and surface hydrophobicity of OVM significantly decreased, which disordered its spatial conformation and weakened its intermolecular interactions. Additionally, enzyme-linked immunosorbent assay (ELISA) results showed that the PEF-assisted alcalase treatment significantly reduced the binding levels of IgE and IgG1, which were 47.66 and 36.41%, respectively. Finally, eight epitopes of OVM were obtained by immunoinformatic tools. Nano-high performance liquid chromatography coupled to tandem mass spectrometry (nano-HPLC MS/MS) results showed that the hydrolysate of OVM and alcalase (HOVM) had nine more peptide-containing epitopes than the hydrolysate of PEF-treated OVM and PEF-treated alcalase (HOVM-PP'), indicating that PEF could promote the elimination of linear epitopes in OVM, thereby reducing OVM allergenicity.
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Affiliation(s)
- Yinli Li
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
| | - Jie Ding
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
| | - Shuyu Zhang
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
| | - Liu Dong
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
| | - Zhijie Bao
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
| | - Songyi Lin
- National Engineering Research Center of Seafood, School of Food Science and Technology, Dalian Polytechnic University, No. 1 Qinggongyuan, Ganjingzi District, Dalian 116034, P. R. China
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You J, Chang Y, Zhao D, Zhuang J, Zhuang W. A Mixture of Functional Complex Extracts from Lycium barbarum and Grape Seed Enhances Immunity Synergistically In Vitro and In Vivo. J Food Sci 2019; 84:1577-1585. [PMID: 31120637 DOI: 10.1111/1750-3841.14611] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Revised: 03/07/2019] [Accepted: 03/16/2019] [Indexed: 11/29/2022]
Abstract
A mixture of multiple ingredients is often more effective than the individual ingredients. The functions of Lycium barbarum polysaccharide (LBP) glycoconjugate and grape seed procyanidins (GSP) are widely known. Here, we investigated the synergistic immune-enhancing activity of LBP and GSP. Atomic force microscopy results suggested that the mixture of LBP and GSP exhibited circular structure unlike LBP alone, and the addition of polyphenols may change the spatial conformation of the sugar chain. The changes in the structure were related to the synergistic effect of the two functional agents on immune recovery. In vitro, the proliferation rate of splenocytes was higher in LBP + GSP group (64.16%), rather than the sum of LBP group (13.01%) and GSP group (43.61%) individually used. This synergistical proliferation of splenocytes may be correlated to the increasing intracellular free calcium levels. Furthermore, the mixture significantly enhanced the immunity in vivo, as evident from the recovery of peripheral white blood cell counts in LBP + GSP group (18.535 × 109 /L) to normal group levels (18.115 × 109 /L) and higher B cell proliferation than normal group (P < 0.05). These results highlight the immune-enhancing activity of the combination of LBP and GSP associated with the structural changes, which may facilitate the development of functional foods with fewer resources but enhanced activities. PRACTICAL APPLICATION: The synergistic effects of LBP and GSP on immunomodulatory were better than the sum of the effects of the individual agents both in vitro and in vivo. Our results may provide a research-based support for the development of related functional products and an insight into the production of food resources with a fewer but more effective functional agents for better results.
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Affiliation(s)
- Jiaqi You
- The State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China Univ. of Science and Technology, 130 Meilong Road, Xuhui Qu, Shanghai, 200237, China
| | - Yaning Chang
- The State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China Univ. of Science and Technology, 130 Meilong Road, Xuhui Qu, Shanghai, 200237, China
| | - Di Zhao
- The State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China Univ. of Science and Technology, 130 Meilong Road, Xuhui Qu, Shanghai, 200237, China
| | - Jiafeng Zhuang
- The State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China Univ. of Science and Technology, 130 Meilong Road, Xuhui Qu, Shanghai, 200237, China
| | - Wei Zhuang
- The State Key Laboratory of Bioreactor Engineering, School of Biotechnology, East China Univ. of Science and Technology, 130 Meilong Road, Xuhui Qu, Shanghai, 200237, China
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Wu Y, Ma Y, Li L, Yang X. Preparation and Antioxidant Activities In Vitro of a Designed Antioxidant Peptide from Pinctada fucata by Recombinant Escherichia coli. J Microbiol Biotechnol 2018; 28:1-11. [PMID: 29361210 DOI: 10.4014/jmb.1708.08032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
An antioxidant peptide derived from Pinctada fucata meat using an Alcalase2.4L enzymatic hydrolysis method (named AOP) and identified by LC-TOF-MS has promising clinical potential for generating cosmetic products that protect skin from sunshine. To date, there have been few published studies investigating the structure-activity relationship in these peptides. To prepare antioxidant peptides better and improve their stability, the design and expression of an antioxidant peptide from Pinctada fucata (named DSAOP) was studied. The peptide contains a common precursor of an expression vector containing an α-helix tandemly linked according to the BamHI restriction sites. The DNA fragments encoding DSAOP were synthesized and subcloned into the expression vector pET-30a (+), and the peptide was expressed mostly as soluble protein in recombinant Escherichia coli. Meanwhile, the DPPH radical scavenging activity, superoxide radical scavenging activity, and hydroxyl radical scavenging activity of DSAOP IC₅₀ values were 0.136 ± 0.006, 0.625 ± 0.025, and 0.306 ± 0.015 mg/ml, respectively, with 2-fold higher DPPH radical scavenging activity compared with chemosynthesized AOP (p < 0.05), as well as higher superoxide radical scavenging activity compared with natural AOP (p < 0.05). This preparation method was at the international advanced level. Furthermore, pilot-scale production results showed that DSAOP was expressed successfully in fermenter cultures, which indicated that the design strategy and expression methods would be useful for obtaining substantial amounts of stable peptides at low costs. These results showed that DSAOP produced with recombinant Escherichia coli could be useful in cosmetic skin care products, health foods, and pharmaceuticals.
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Affiliation(s)
- Yanyan Wu
- Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, P.R. China
| | - Yongkai Ma
- Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, P.R. China.,College of Food Science and Engineering, Ocean University of China, Qingdao 266003, P.R. China
| | - Laihao Li
- Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, P.R. China
| | - Xianqing Yang
- Key Laboratory of Aquatic Product Processing, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510300, P.R. China
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Chen LY, Chen X, Tian XL, Yu XH. Effects of tetrandrine on calcium transport, protein fluorescences and membrane fluidity of sarcoplasmic reticulum. Br J Pharmacol 2000; 131:530-6. [PMID: 11015304 PMCID: PMC1572342 DOI: 10.1038/sj.bjp.0703582] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
To understand whether the molecular mechanism of Tetrandrine (Tet)'s pharmacological effects is concerned with sarcoplasmic reticulum calcium transport so as to be involved in myocardial contractility, we observed the effects of Tet on calcium transport and membrane structure of rabbit skeletal muscle sarcoplasmic reticulum vesicles (SR) and rat cardiac sarcoplasmic reticulum vesicles (CSR). Calcium uptake was monitored with a dual-wavelength spectrophotometer. Protein conformation and fluorescence polarization were measured by fluospectrophotometric method and membrane lipids labelled with fluorescence probes for SR, respectively. 128 micromol l(-1) Tet reduced the initial rate of calcium uptake to 59% of control 6 min after reaction. Tet un-competitively inhibited SR Ca(2+), Mg(2+)-ATPase activity, causing the stoichiometric ratio of SR Ca(2+)/ATP to decrease to 1.43 from 2.0 of control. Inhibitory rates on SR Ca(2+),Mg(2+)-ATPase by Tet were reduced from 60% in the absence of phosphate to 50% in the presence of phosphate and reduced from 92% in 1 mmol l(-1) ATP to 60% in 5 mmol l(-1) ATP. Tet markedly reduced SR intrinsic protein fluorescence, while it slightly decreased the thiol(SH)-modified protein fluorescence of SR labelled with N-(3-pyrene)-maleimide. Tet slightly increased fluorescence polarization in the middle and deep layers of SR membrane lipids labelled with 7- or 12-(9-anthroyloxy) stearic acid (AS) probes, whereas it did not change that of SR labelled with 1, 6-diphenyl-1,3,5-hexatrine (DPH). These results revealed that prevention of SR calcium uptake by Tet was due to inhibition of the SR calcium pump Ca(2+),Mg(2+)-ATPase, changes in spatial conformation of the pumps protein molecules and a decrease in the extent of motion of membrane lipid molecules, thus altering the regulation of [Ca(2+)](i) and myocardial contractility.
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Affiliation(s)
- L Y Chen
- Division of Biochemistry, Cardiovascular Institute, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China.
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