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Physiological studies on reducing the deleterious effects

Name: Physiological studies on reducing the deleterious effects
Brand: VDM Verlag
SKU: 06839128
Price: 49.96 EUR
Availability: InStock
Author: Mahmoud Atef
ISBN: 9783639323351

Mahmoud Atef

Ahmad Mahmoud El Gizawy

Hussein Mohamed Galal El-Din Ali

Jazyk

Angličtina

Kniha Brožovaná

Libristo kód: 06839128

Nakladateľstvo VDM Verlag, február 2011

The effect of various compounds, (i.e., reducing agents (ascorbic, sodium sulfite, bisulfite and thi... Celý popis

Libristo kód: 06839128

121 b

49.96 €

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The effect of various compounds, (i.e., reducing agents (ascorbic, sodium sulfite, bisulfite and thiosulphate), thiol (L-cysteine), and organic acids (glycine, aspartic, glutamic, oxalic, succinic, phthalic, tartaric, citric, adipic, fumaric, and benzoic) on the browning process and polyphenol oxidase activity of fresh-cut of butterhead lettuce and two potato cultivars (Spunta and Desiree) were evaluated. Results indicated that slices slightly elevated enzyme activity and browning index (BI) in both cultivars more than those of sticks. Mechanistic study indicated that ascorbic acid reduced the quinone, resulted from PPO activity, back to the starting colorless catechol, where the quinone peak in the UV spectrum (435 nm) vanished completely upon addition of ascorbic acids. Cysteine did not reduce the formed quinone, but rather formed a cysteine-quinone adduct as a new peak appeared at the expenses of the quinone peak. Regarding the organic and amino acids, they worked as PPO inhibitor either as acidulants or metal chelators. Applications showed that compounds reacted with the resulted quinone were more efficient antibrowning agents than PPO inhibitors.§§Author: Mahmoud A.Saleh, M.Sc. studied Agricultural sciences from Ain Shams university, Egypt.