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Lotfi Shahpar E, Mahdavi A, Mohamadnia Z. Inhibitory Effects, Fluorescence Studies, and Molecular Docking Analysis of Some Novel Pyridine-Based Compounds on Mushroom Tyrosinase. Biochemistry 2024; 63:2063-2074. [PMID: 39110954 DOI: 10.1021/acs.biochem.4c00204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/21/2024]
Abstract
Melanin biosynthesis in different organisms is performed by a tyrosinase action. Excessive enzyme activity and pigment accumulation result in different diseases and disorders including skin cancers, blemishes, and darkening. In fruits and vegetables, it causes unwanted browning of these products and reduces their appearance quality and economic value. Inhibiting enzyme activity and finding novel powerful and safe inhibitors are highly important in agriculture, food, medical, and pharmaceutical industries. In this regard, in the present study, some novel synthetic pyridine-based compounds including 2,6-bis (tosyloxymethyl) pyridine (compound 3), 2,6-bis (butylthiomethyl) pyridine (compound 4), and 2,6-bis (phenylthiomethyl) pyridine (compound 5) were synthesized for the first time, and their inhibitory potencies were assessed on mushroom tyrosinase diphenolase activity. The results showed that while all tested compounds significantly decreased the enzyme activity, compounds 4 and 5 had the highest inhibitory effects (respectively, 80 and 89% inhibition with the IC50 values of 17.0 and 9.0 μmol L-1), and the inhibition mechanism was mixed-type for both compounds. Ligand-binding studies were carried out by fluorescence quenching and molecular docking methods to investigate the enzyme-compound interactions. Fluorescence quenching results revealed that the compounds can form nonfluorescent complexes with the enzyme and result in quenching of its intrinsic emission by the static process. Molecular docking analyses predicted the binding positions and the amino acid residues involved in the interactions. These compounds appear to be suitable candidates for more studies on tyrosinase inhibition.
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Affiliation(s)
- Elahe Lotfi Shahpar
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Gavazang, Zanjan 45195-1159, Iran
| | - Atiyeh Mahdavi
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Gavazang, Zanjan 45195-1159, Iran
| | - Zahra Mohamadnia
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Gavazang, Zanjan 45195-1159, Iran
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2
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Muñoz-Pina S, Duch-Calabuig A, Ruiz De Assín David E, Ros-Lis JV, Amorós P, Argüelles Á, Andrés A. Bioactive compounds and enzymatic browning inhibition in cloudy apple juice by a new magnetic UVM-7-SH mesoporous material. Food Res Int 2022; 162:112073. [DOI: 10.1016/j.foodres.2022.112073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 09/14/2022] [Accepted: 10/18/2022] [Indexed: 11/27/2022]
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3
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Pang LJ, Adeel M, Shakoor N, Guo KR, Ma DF, Ahmad MA, Lu GQ, Zhao MH, Li SE, Rui YK. Engineered Nanomaterials Suppress the Soft Rot Disease ( Rhizopus stolonifer) and Slow Down the Loss of Nutrient in Sweet Potato. NANOMATERIALS 2021; 11:nano11102572. [PMID: 34685013 PMCID: PMC8537040 DOI: 10.3390/nano11102572] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/25/2021] [Accepted: 09/26/2021] [Indexed: 11/16/2022]
Abstract
About 45% of the world’s fruit and vegetables are wasted, resulting in postharvest losses and contributing to economic losses ranging from $10 billion to $100 billion worldwide. Soft rot disease caused by Rhizopus stolonifer leads to postharvest storage losses of sweet potatoes. Nanoscience stands as a new tool in our arsenal against these mounting challenges that will restrict efforts to achieve and maintain global food security. In this study, three nanomaterials (NMs) namely C60, CuO, and TiO2 were evaluated for their potential application in the restriction of Rhizopus soft rot disease in two cultivars of sweet potato (Y25, J26). CuO NM exhibited a better antifungal effect than C60 and TiO2 NMs. The contents of three important hormones, indolepropionic acid (IPA), gibberellic acid 3 (GA-3), and indole-3-acetic acid (IAA) in the infected J26 sweet potato treated with 50 mg/L CuO NM were significantly higher than those of the control by 14.5%, 10.8%, and 24.1%. CuO and C60 NMs promoted antioxidants in both cultivars of sweet potato. Overall, CuO NM at 50 mg/L exhibited the best antifungal properties, followed by TiO2 NM and C60 NM, and these results were further confirmed through scanning electron microscope (SEM) analysis. The use of CuO NMs as an antifungal agent in the prevention of Rhizopus stolonifer infections in sweet potatoes could greatly reduce postharvest storage and delivery losses.
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Affiliation(s)
- Lin-Jiang Pang
- College of Food and Health, Zhejiang A&F University, Hangzhou 311300, China; (L.-J.P.); (M.-H.Z.); (S.-E.L.)
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China
| | - Muhammed Adeel
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (M.A.); (N.S.); (K.-R.G.); (Y.-K.R.)
- BNU-HKUST Laboratory of Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University Zhuhai Subcampus, 18 Jinfeng Road, Tangjiawan, Zhuhai 519085, China
| | - Noman Shakoor
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (M.A.); (N.S.); (K.-R.G.); (Y.-K.R.)
| | - Ke-Rui Guo
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (M.A.); (N.S.); (K.-R.G.); (Y.-K.R.)
- Laboratory of Soil Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
| | - Dai-Fu Ma
- School of Life Science, Jiangsu Normal University, Xuzhou 221116, China
- Key Laboratory of Biology and Genetic Improvement of Sweet Potato, Ministry of Agriculture and Rural Affairs, Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou 221121, China
- Correspondence: or (D.-F.M.); (G.-Q.L.)
| | - Muhammad Arslan Ahmad
- Shenzhen Key Laboratory of Marine Bioresource and Eco-Environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China;
| | - Guo-Quan Lu
- College of Food and Health, Zhejiang A&F University, Hangzhou 311300, China; (L.-J.P.); (M.-H.Z.); (S.-E.L.)
- Correspondence: or (D.-F.M.); (G.-Q.L.)
| | - Mei-Hui Zhao
- College of Food and Health, Zhejiang A&F University, Hangzhou 311300, China; (L.-J.P.); (M.-H.Z.); (S.-E.L.)
| | - Sheng-E Li
- College of Food and Health, Zhejiang A&F University, Hangzhou 311300, China; (L.-J.P.); (M.-H.Z.); (S.-E.L.)
| | - Yu-Kui Rui
- Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China; (M.A.); (N.S.); (K.-R.G.); (Y.-K.R.)
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4
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Rho SJ, Mun S, Park J, Kim YR. Retarding Oxidative and Enzymatic Degradation of Phenolic Compounds Using Large-Ring Cycloamylose. Foods 2021; 10:foods10071457. [PMID: 34201816 PMCID: PMC8303965 DOI: 10.3390/foods10071457] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/16/2021] [Accepted: 06/17/2021] [Indexed: 11/16/2022] Open
Abstract
The phenolic compounds (PCs) abundant in fruits and vegetables are easily browned by oxygen and browning enzymes, with subsequent destruction of nutrients during food processing and storage. Therefore, natural anti-browning additives are required to control these reactions. The aim of the present study was to investigate the feasibility of cycloamylose (CA) complexation as a way to improve stability of PCs against oxidation and browning enzymes. The complex was prepared by reacting enzymatically produced CA with a degree of polymerization of 23-45 with PCs in aqueous solution. No significant differences were observed between the PCs and their CA complexes in 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging experiments. However, the reduction rate of their antioxidant activity was clearly reduced in the presence of CA for as long as 4 weeks. At the studied concentrations, the activity of polyphenol oxidase on all of the tested PC species was inhibited in the presence of CA, although this effect was less evident as the substrate concentration increased. The higher the CA concentration added to apple juice, the lower the variation in the total color difference (ΔE*) during storage, confirming that CA could be used as an effective natural anti-browning agent. Our study is the first to study the potential of CA as a natural material for browning control. The results obtained will provide useful information for active food applications requiring oxidative stability in fruit products.
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Affiliation(s)
- Shin-Joung Rho
- Center for Food and Bioconvergence, Seoul National University, Seoul 08826, Korea; (S.-J.R.); (J.P.)
| | - Saehun Mun
- Department of Food and Nutrition, Soonchunhyang University, Asan 31538, Korea;
| | - Jiwoon Park
- Center for Food and Bioconvergence, Seoul National University, Seoul 08826, Korea; (S.-J.R.); (J.P.)
| | - Yong-Ro Kim
- Center for Food and Bioconvergence, Seoul National University, Seoul 08826, Korea; (S.-J.R.); (J.P.)
- Department of Biosystems Engineering, Research Institute of Agriculture and Life Sciences, Global Smart Farm Convergence Major, Seoul National University, Seoul 08826, Korea
- Correspondence: ; Tel.: +82-2-880-4607
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Muñoz-Pina S, Amorós P, Haskouri JE, Andrés A, Ros-Lis JV. Use of Silica Based Materials as Modulators of the Lipase Catalyzed Hydrolysis of Fats under Simulated Duodenal Conditions. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:nano10101927. [PMID: 32992446 PMCID: PMC7601910 DOI: 10.3390/nano10101927] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/20/2020] [Accepted: 09/23/2020] [Indexed: 05/03/2023]
Abstract
The effect of silica materials and their functionalization in the lipase catalyzed fat hydrolysis has been scarcely studied. Fifteen silica materials were prepared and their effect on the fat hydrolysis was measured, under simulated duodenal conditions, using the pH-stat method. The materials are composed of the combination of three supports (Stöber massive silica nanoparticles, Stöber mesoporous nanoparticles and UVM-7) and four surface functionalizations (methyl, trimethyl, propyl and octyl). In addition, the non-functionalized materials were tested. The functional groups were selected to offer a hydrophobic character to the material improving the interaction with the fat globules and the lipase. The materials are able to modulate the lipase activity and their effect depending on the support topology and the organic covering, being able to increase or reduce the fat hydrolysis. Depending of the material, relative fat hydrolysis rates of 75 to 140% in comparison with absence of the material were obtained. The results were analyzed by Partial Least Square Regression and suggest that the alkyl modified mesopores are able to improve the fat hydrolysis, by contrast the non-porous nanoparticles and the textural pores tend to induce inhibition. The effects are more pronounced for materials containing long alkyl chains and/or in absence of taurodeoxycholate.
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Affiliation(s)
- Sara Muñoz-Pina
- Inorganic Chemistry Department, REDOLí Group, Universitat de València, Burjassot, 46100 Valencia, Spain;
| | - Pedro Amorós
- Instituto de Ciencia de Materiales, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna Valencia, Spain; (P.A.); (J.E.H.)
| | - Jamal El Haskouri
- Instituto de Ciencia de Materiales, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna Valencia, Spain; (P.A.); (J.E.H.)
| | - Ana Andrés
- Instituto Universitario de Ingeniería de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València Camino de Vera s/n, 46022 Valencia, Spain;
| | - José V. Ros-Lis
- Inorganic Chemistry Department, REDOLí Group, Universitat de València, Burjassot, 46100 Valencia, Spain;
- Correspondence:
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6
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Han QY, Liu F, Wen X, Ni YY. Kinetic, spectroscopic, and molecular docking studies on the inhibition of membrane-bound polyphenol oxidase from Granny Smith apples (Malus domestica Borkh.). Food Chem 2020; 338:127928. [PMID: 32919374 DOI: 10.1016/j.foodchem.2020.127928] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 08/11/2020] [Accepted: 08/23/2020] [Indexed: 02/09/2023]
Abstract
We investigated the inhibitory effect and binding mechanism of four selected compounds (ascorbic acid, l-cysteine, glutathione, and citric acid) on membrane-bound polyphenol oxidases (mPPO) using spectroscopic and molecular docking techniques. Kinetic analysis demonstrated that these inhibitors reversibly inhibited the mPPO activity. Fluorescence spectroscopy revealed that the intrinsic fluorescence intensity of mPPO was quenched by inhibitors with a single class of the inhibition site on mPPO. Amino acid residues His 180, His 201, His 366, Cys 184, Glu 328, and Asn 333 were the important binding sites in the active center. These sites were identified using molecular docking techniques. Our findings suggested that the inhibitors were allosterically bound to the active center of mPPO through hydrogen bonds and ion contacts. This study provides new insights into the active site residues responsible for catalyzing mPPO and provides applicable information about the design of mPPO inhibitors.
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Affiliation(s)
- Qian-Yun Han
- College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Beijing 100083, China; National Engineering Research Center for Fruits and Vegetables Processing, Beijing 100083, China; Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Beijing 100083, China
| | - Fang Liu
- College of Food Science and Engineering, Northwest A & F University, Yang Ling, Shaanxi 712100, China
| | - Xin Wen
- College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Beijing 100083, China; National Engineering Research Center for Fruits and Vegetables Processing, Beijing 100083, China; Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Beijing 100083, China
| | - Yuan-Ying Ni
- College of Food Science and Nutritional Engineering, China Agricultural University, No. 17 Qinghua East Road, Beijing 100083, China; National Engineering Research Center for Fruits and Vegetables Processing, Beijing 100083, China; Key Laboratory of Fruits and Vegetables Processing, Ministry of Agriculture, Beijing 100083, China.
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7
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Muñoz-Pina S, Ros-Lis JV, Delgado-Pinar EA, Martı Nez-Camarena A, Verdejo B, Garcı A-España E, Argüelles Á, Andrés A. Inhibitory Effect of Azamacrocyclic Ligands on Polyphenol Oxidase in Model and Food Systems. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2020; 68:7964-7973. [PMID: 32609498 DOI: 10.1021/acs.jafc.0c02407] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Enzymatic browning is one of the main problems faced by the food industry due to the enzyme polyphenol oxidase (PPO) provoking an undesirable color change in the presence of oxygen. Here, we report the evaluation of 10 different azamacrocyclic compounds with diverse morphologies as potential inhibitors against the activity of PPO, both in model and real systems. An initial screening of 10 ligands shows that all azamacrocyclic compounds inhibit to some extent the enzymatic browning, but the molecular structure plays a crucial role on the power of inhibition. Kinetic studies of the most active ligand (L2) reveal a S-parabolic I-parabolic noncompetitive inhibition mechanism and a remarkable inhibition at micromolar concentration (IC50 = 10 μM). Furthermore, L2 action has been proven on apple juice to significantly reduce the enzymatic browning.
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Affiliation(s)
- Sara Muñoz-Pina
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - José V Ros-Lis
- REDOLı́, Departamento de Quı́mica Inorgánica, Universitat de València, 46100 Burjassot, Valencia, Spain
| | - Estefanı A Delgado-Pinar
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Alvaro Martı Nez-Camarena
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Begoña Verdejo
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Enrique Garcı A-España
- Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, Paterna, Valencia, Spain
| | - Ángel Argüelles
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - Ana Andrés
- Instituto Universitario de Ingenierı́a de Alimentos para el Desarrollo (IUIAD-UPV), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
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8
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Li J, Chi G, Wang L, Wang F, He S. Isolation, identification, and inhibitory enzyme activity of phenolic substances present in Spirulina. J Food Biochem 2020; 44:e13356. [PMID: 32627220 DOI: 10.1111/jfbc.13356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/12/2020] [Accepted: 06/09/2020] [Indexed: 11/28/2022]
Abstract
Spirulina species are edible with high nutritional as well as potential therapeutic values. In this work, we show that phenolic extracts from Spirulina (p-Coumaric acid) possessed inhibitory potential on α-glucosidase (IC50 = 1.67 ± 0.02 mM) and tyrosinase (IC50 = 52.71 ± 3.01 mM). Moreover, p-Coumaric acid inhibited α-glucosidase and tyrosinase in a reversible mixed-type manner. Interestingly, molecular docking demonstrated that p-Coumaric acid penetrated in depth of the active-site of tyrosinase and α-glucosidase by the noncovalent force or interaction. Among them, making polar interactions with Cu2+ ions and the amino acid residue capable of forming cation-π significantly contribute to the strong binding of p-Coumaric acid on tyrosinase. p-Coumaric acid was isolated and identified from Spirulina for the first time, which can be used as a lead compound for the design of functional food additives and skin-lightening active ingredient in cosmetics, and pharmaceuticals against type 2 diabetes. PRACTICAL APPLICATIONS: A natural, food-derived compound possessing the potential for the development of an anti-hyperglycaemic and skin-lightening supplement is very promising in cosmetics, functional food, and pharmaceuticals against type 2 diabetes. Herein, the present study is the first to present high levels of p-Coumaric acid from Spirulina, which simultaneously possessed inhibition potential on α-glucosidase and tyrosinase. Importantly, we gained initial information about the polypeptide-inhibitor interactions and underlying mechanisms for Spirulina's therapeutic effects, which will provide the bases for developing new drugs for preventing or treating type 2 diabetes and enzyme inhibitors. Moreover, this work also demonstrates the potential of the extraction of high-value chemicals from Spirulina waste.
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Affiliation(s)
- Jian Li
- College of Food and Biological Engineering, Jimei University, Xiamen, P.R. China
| | - Guoxiang Chi
- College of Food and Biological Engineering, Jimei University, Xiamen, P.R. China
| | - Li Wang
- College of Food and Biological Engineering, Jimei University, Xiamen, P.R. China
| | - Fang Wang
- College of Chemistry and Life Science, Quanzhou Normal College, Quanzhou, P.R. China
| | - Shansheng He
- College of Food and Biological Engineering, Jimei University, Xiamen, P.R. China
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9
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Muñoz-Pina S, Ros-Lis JV, Argüelles Á, Martínez-Máñez R, Andrés A. Influence of the functionalisation of mesoporous silica material UVM-7 on polyphenol oxidase enzyme capture and enzymatic browning. Food Chem 2020; 310:125741. [DOI: 10.1016/j.foodchem.2019.125741] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 10/01/2019] [Accepted: 10/17/2019] [Indexed: 11/16/2022]
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10
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Vimala Bharathi S, Maria Leena M, Moses J, Anandharamakrishnan C. Zein‐based anti‐browning cling wraps for fresh‐cut apple slices. Int J Food Sci Technol 2019. [DOI: 10.1111/ijfs.14401] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- S.K. Vimala Bharathi
- Computational Modeling and Nanoscale Processing Unit, Indian Institute of Food Processing Technology Thanjavur India
| | - M. Maria Leena
- Computational Modeling and Nanoscale Processing Unit, Indian Institute of Food Processing Technology Thanjavur India
| | - J.A. Moses
- Computational Modeling and Nanoscale Processing Unit, Indian Institute of Food Processing Technology Thanjavur India
| | - C. Anandharamakrishnan
- Computational Modeling and Nanoscale Processing Unit, Indian Institute of Food Processing Technology Thanjavur India
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Peng X, Du C, Yu H, Zhao X, Zhang X, Wang X. Purification and characterization of polyphenol oxidase (PPO) from water yam (Dioscorea alata). CYTA - JOURNAL OF FOOD 2019. [DOI: 10.1080/19476337.2019.1634645] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Xinyan Peng
- College of Food Engineering, Ludong University, Yantai, Shandong, China
- Bio-Nanotechnology Institute, Ludong University, Yantai, Shandong, China
| | - Chao Du
- College of Food Engineering, Ludong University, Yantai, Shandong, China
- Bio-Nanotechnology Institute, Ludong University, Yantai, Shandong, China
| | - Haiyang Yu
- Department of Food Engineering, Shandong Business Institute, Yantai, Shandong, China
| | - Xiaoyu Zhao
- College of Food Engineering, Ludong University, Yantai, Shandong, China
| | - Xiuyuan Zhang
- College of Food Engineering, Ludong University, Yantai, Shandong, China
| | - Xiaoyu Wang
- College of Food Engineering, Ludong University, Yantai, Shandong, China
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12
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Benaceur F, Gouzi H, Meddah B, Neifar A, Guergouri A. Purification and characterization of catechol oxidase from Tadela (Phoenix dactylifera L.) date fruit. Int J Biol Macromol 2019; 125:1248-1256. [DOI: 10.1016/j.ijbiomac.2018.09.101] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/13/2018] [Accepted: 09/17/2018] [Indexed: 01/11/2023]
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13
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Tryptophan residue enhances in vitro walnut protein-derived peptides exerting xanthine oxidase inhibition and antioxidant activities. J Funct Foods 2019. [DOI: 10.1016/j.jff.2018.11.024] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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14
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Fuentes Campo A, Sancho MI, Melo G, Dávila YA, Gasull E. In vitro and in vivo inhibition of Hass avocado polyphenol oxidase enzymatic browning by paeonol, β-cyclodextrin, and paeonol:β-cyclodextrin inclusion complex. J Biosci Bioeng 2018; 127:703-709. [PMID: 30573385 DOI: 10.1016/j.jbiosc.2018.11.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/01/2018] [Accepted: 11/15/2018] [Indexed: 10/27/2022]
Abstract
Polyphenol oxidase (PPO) was extracted from Hass avocados and its physicochemical properties were analyzed. The optimum pH and temperature of the enzyme were pH 7.5 and 20°C. This PPO showed a high thermal stability, since 26% of the initial activity was retained by the enzyme after heating at 60°C for 40 min. Inhibition studies were performed using different chemical reagents, and the order in the inhibition efficiency was paeonol > 4-hydroxybenzaldehyde > β-cyclodextrin (β-CD). The first two inhibitors presented a non-competitive mechanism while the inhibition by β-CD results from a mixed type mechanism. Since the aqueous solubility of paeonol (a natural compound) is very low, the inclusion complex between this drug and β-CD was obtained in solution and solid state. The stoichiometry of the paeonol:β-CD complex was 1:1 and its ΔG° of formation was -26 kJ/mol. The complexation of paeonol by β-CD not only enhances the aqueous solubility and thermal stability of the drug, but also improves the in vitro inhibition efficiency against PPO. Colorimetric analysis on avocados pulp (in vivo) showed that the inclusion complex does not increase the inhibitory effect of paeonol, remaining practically unchanged. However, the formulation of paeonol:β-CD inclusion complex allows employing this compound as PPO inhibitor in aqueous solutions.
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Affiliation(s)
- Anahí Fuentes Campo
- Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, Chacabuco 917, 5700 San Luis, Argentina
| | - Matias I Sancho
- Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, IMIBIO-CONICET, Chacabuco 917, 5700 San Luis, Argentina.
| | - Gisela Melo
- Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, IMIBIO-CONICET, Chacabuco 917, 5700 San Luis, Argentina
| | - Yamina A Dávila
- Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, INTEQUI-CONICET, Chacabuco 917, 5700 San Luis, Argentina
| | - Estela Gasull
- Universidad Nacional de San Luis, Facultad de Química, Bioquímica y Farmacia, IMIBIO-CONICET, Chacabuco 917, 5700 San Luis, Argentina
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15
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Determination of acceptability and shelf life of fresh-cut pear by digital image analysis. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2018. [DOI: 10.1007/s11694-018-9907-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Dong YZ, Han WJ, Choi HJ. Polyaniline Coated Core-Shell Typed Stimuli-Responsive Microspheres and Their Electrorheology. Polymers (Basel) 2018; 10:E299. [PMID: 30966334 PMCID: PMC6414992 DOI: 10.3390/polym10030299] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 03/01/2018] [Accepted: 03/05/2018] [Indexed: 11/17/2022] Open
Abstract
Functional core-shell-structured particles have attracted considerable attention recently. This paper reviews the synthetic methods and morphologies of various electro-stimuli responsive polyaniline (PANI)-coated core-shell-type microspheres, including PANI-coated Fe₃O₄, SiO₂, Fe₂O₃, TiO₂, poly(methyl methacrylate), poly(glycidyl methacrylate), and polystyrene along with their electrorheological (ER) characteristics when prepared by dispersing these particles in an insulating medium. In addition to the various rheological characteristics and their analysis, such as shear stress and yield stress of their ER fluids, this paper summarizes some of the mechanisms proposed for ER fluids to further understand the responses of ER fluids to an externally applied electric field.
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Affiliation(s)
- Yu Zhen Dong
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
| | - Wen Jiao Han
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
| | - Hyoung Jin Choi
- Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
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