Polyphenol Oxidase
Mostrando 1-12 de 78 artigos, teses e dissertações.
-
1. Inhibitory effects of L-3-phenyllacitc acid on the activity of mushnroom pholyphenol oxidase
Abstract Polyphenol oxidase is the popular enzyme involved in fruit-vegetable browning and melanin synthesis. In the present paper, L-3-phenyllactic acid, a natural bacteriostatic substance, was investigated as an inhibitor of polyphenol oxidase. The results were demonstrated that the residual enzyme activity of polyphenol oxidase decreased gradually with th
Food Sci. Technol. Publicado em: 2021-06
-
2. Phenotypic Characterization and Synthesis of Extracellular Catecholase from a Newly Isolated Bacterium Pseudomonas sp. BSC-6
Abstract Catecholase (EC 1.10.3.1), an oxidoreductase enzyme is a key member of polyphenol oxidase family which catalyze the degradation of catechol. This enzyme possesses vast applications in diverse areas and is found in bacteria, fungi, mushrooms, higher plants, arthropods, amphibians and mammals. Catechol, a phenolic compound, is used as a starting mate
Braz. arch. biol. technol.. Publicado em: 25/11/2019
-
3. Ethanol and citric acid improve longevity in Gerbera cv. Mistique
Resumo Etanol e ácido cítrico podem aumentar a longevidade em algumas flores de corte. Porém, seu uso deve ser de extremo cuidado, com métodos de aplicação e concentrações específicas para cada tipo de flor de corte. Assim, o objetivo foi estudar as mudanças físico-químicas e fisiológicas na longevidade de gérberas de corte cv. Mistique, submet
Ornam. Hortic.. Publicado em: 12/08/2019
-
4. POLYPHENOL OXIDASE AND PEROXIDASE ENZYME ASSAYS IN SWEET POTATO CULTIVARS HARVESTED AT DIFFERENT TIMES
RESUMO Ensaios enzimáticos são baseados em metodologias descritas na literatura. Entretanto, a cinética enzimática deve ser ajustada para resultados mais confiáveis. Objetivou-se ajustar os ensaios testando diferentes volumes de extrato de polifenoloxidase (PPO) e peroxidase (POD) e tempos de reação em cultivares de batata-doce colhidas em diferentes
Rev. Caatinga. Publicado em: 18/07/2019
-
5. Effect of multilayer nylon packages on the oxidative damage of minimally processed yam
Resumo A adequação da embalagem de armazenamento é um aspecto importante para minimizar a deterioração fisiológica e melhorar a conservação de produtos minimamente processados. Dessa forma, o objetivo deste estudo foi avaliar as alterações fisiológicas e bioquímicas associadas à perda de qualidade de inhame minimamente processado, mantido em dua
Braz. J. Food Technol.. Publicado em: 16/05/2019
-
6. Effect of Blanching on Enzyme Activity and Bioactive Compounds of Blackberry
ABSTRACT The inactivation of peroxidase and polyphenol oxidase and the degradation of phenolic compounds, anthocyanins, and antioxidant activity in blackberry were investigated during blanching in water at 80-90 °C, and in steam, from 0 to 10 minutes. The enzyme kinetics indicated the presence of two isoenzymes with different thermal stability, following tw
Braz. arch. biol. technol.. Publicado em: 14/11/2018
-
7. Cultivar affects the color change kinetics of sugarcane juice
Abstract This study evaluated the influence of different Brazilian cultivars (RB867515/C1, SP813250/C2, RB92579/C3 and CTC02/C4) on unprocessed sugarcane juice quality by physicochemical, microbiological and enzymatic analysis. Color parameters were determined during six days at 10 °C. The experimental design was completely randomized with four treatments
Food Sci. Technol. Publicado em: 04/10/2018
-
8. Validation of spectrophotometric microplate methods for polyphenol oxidase and peroxidase activities analysis in fruits and vegetables
Abstract Enzymes polyphenol oxidase (PPO) and peroxidase (POD) play important roles in the processing of fruits and vegetables, since they can produce undesirable changes in color, texture and flavor. Classical methods of activity assessment are based on cuvette spectrophotometric readings. This work aims to propose, to validate and to test microplate spectr
Food Sci. Technol. Publicado em: 25/05/2017
-
9. Purification and characterization of polyphenol oxidase from purslane
Abstract The polyphenol oxidase (PPO) is an enzyme that is responsible for the enzymatic browning of fruits and vegetables. This is generally undesired process and need to be prevented in food technology. PPO from purslane was purified, characterised and the kinetic parameters for three substrates namely, catechol, L-Dopa and 4-methylcatechol were determined
Food Sci. Technol. Publicado em: 20/03/2017
-
10. Extraction optimization of polyphenols, antioxidant and xanthine oxidase inhibitory activities from Prunus salicina Lindl.
Abstract Optimization of polyphenols extraction from plum (Prunus salicina Lindl.) was evaluated using response surface methodology. The Box-Behnken experimental results showed the optimal conditions involved an extraction temperature of 59 °C, a sonication time of 47 min, and an ethanol concentration of 61% respectively. The maximum extraction yield of tot
Food Sci. Technol. Publicado em: 06/05/2016
-
11. Characterization of polyphenol oxidase in two cocoa (Theobroma cacao L.) cultivars produced in the south of Bahia, Brazil
Abstract The reactions leading to the formation of precursors of chocolate flavor are performed by endogenous enzymes present in the cocoa seed. Polyphenol oxidase (PPO) presence and activity during fermentation of cocoa beans is responsible for the development of flavor precursors and is also implicated in the reduction of bitterness and astringency. Howeve
Food Sci. Technol. Publicado em: 19/01/2016
-
12. Chemical products induce resistance to
Xanthomonas perforans in tomatoThe bacterial spot of tomato, caused by
Xanthomonas spp., is a very important disease, especially in the hot and humid periods of the year. The chemical control of the disease has not been very effective for a number of reasons. This study aimed to evaluate, under greenhouse conditions, the efficacy of leaf-spraying chemicals (acibenzolarBraz. J. Microbiol.. Publicado em: 21/07/2015