Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits

This study characterized the polyphenol oxidases (PPO) from four cultivars of eggplant (Thai Solanum melogena), representing a variety of fruit characteristics, textures, and peel colors. The study compared the effects of different substrate specificity, temperature, pH, thermal stability, and inhib...

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Main Authors: Chanasut U., Rattanapanone N.
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Published: Chiang Mai University 2015
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http://cmuir.cmu.ac.th/handle/6653943832/38673
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spelling th-cmuir.6653943832-386732015-06-16T07:53:53Z Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits Chanasut U. Rattanapanone N. Rattanapanone N. Multidisciplinary This study characterized the polyphenol oxidases (PPO) from four cultivars of eggplant (Thai Solanum melogena), representing a variety of fruit characteristics, textures, and peel colors. The study compared the effects of different substrate specificity, temperature, pH, thermal stability, and inhibitors on PPO activity to determine the optimal conditions for generating natural browning agents. Khaow yoa (OW) and Moung khan khew (OP) cultivars had the highest specific activity (OW: 631.33 ± 38.29 ΔOD min-1 mgProtein-1; OP: 652.54 ± 9.59 ΔOD min-1mgProtein-1), using 4-methylcatechol as a substrate. The best substrate for PPO from each cultivar was different: catechin for cultivars OW and OP, 4-MC for Choa pra ya (RG), and 4-tert butylcatechol for Khaew yoa (OG). Using 4-methylcatechol as a substrate, the optimal conditions for maximizing PPO activity were similar for all four cultivars: a pH of 6.0, a temperature of 30oC, and an enzyme concentration of 1% (v/v). For all cultivars, PPO activity decreased with increasing inactivation time after the temperature reached 30oC. The study tested the inhibitory effects of compounds such as ascorbic acid, citric acid, sodium chloride, sodium metabisulfite, and EDTA on the activity of residual enzyme. Ascorbic acid and sodium metabisulfite were the most effective inhibitors for these eggplant PPOs. 2015-06-16T07:53:53Z 2015-06-16T07:53:53Z 2012-07-01 Article 16851994 2-s2.0-84872407838 http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84872407838&origin=inward http://cmuir.cmu.ac.th/handle/6653943832/38673 Chiang Mai University
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Multidisciplinary
spellingShingle Multidisciplinary
Chanasut U.
Rattanapanone N.
Rattanapanone N.
Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
description This study characterized the polyphenol oxidases (PPO) from four cultivars of eggplant (Thai Solanum melogena), representing a variety of fruit characteristics, textures, and peel colors. The study compared the effects of different substrate specificity, temperature, pH, thermal stability, and inhibitors on PPO activity to determine the optimal conditions for generating natural browning agents. Khaow yoa (OW) and Moung khan khew (OP) cultivars had the highest specific activity (OW: 631.33 ± 38.29 ΔOD min-1 mgProtein-1; OP: 652.54 ± 9.59 ΔOD min-1mgProtein-1), using 4-methylcatechol as a substrate. The best substrate for PPO from each cultivar was different: catechin for cultivars OW and OP, 4-MC for Choa pra ya (RG), and 4-tert butylcatechol for Khaew yoa (OG). Using 4-methylcatechol as a substrate, the optimal conditions for maximizing PPO activity were similar for all four cultivars: a pH of 6.0, a temperature of 30oC, and an enzyme concentration of 1% (v/v). For all cultivars, PPO activity decreased with increasing inactivation time after the temperature reached 30oC. The study tested the inhibitory effects of compounds such as ascorbic acid, citric acid, sodium chloride, sodium metabisulfite, and EDTA on the activity of residual enzyme. Ascorbic acid and sodium metabisulfite were the most effective inhibitors for these eggplant PPOs.
format Article
author Chanasut U.
Rattanapanone N.
Rattanapanone N.
author_facet Chanasut U.
Rattanapanone N.
Rattanapanone N.
author_sort Chanasut U.
title Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
title_short Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
title_full Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
title_fullStr Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
title_full_unstemmed Characterization and comparative study of polyphenol oxidases from four cultivars of Thai Solanum melogena fruits
title_sort characterization and comparative study of polyphenol oxidases from four cultivars of thai solanum melogena fruits
publisher Chiang Mai University
publishDate 2015
url http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84872407838&origin=inward
http://cmuir.cmu.ac.th/handle/6653943832/38673
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