The Influence of Stereochemistry of Antioxidants and Flavanols on Oxidation Processes in a Model Wine System: Ascorbic Acid, Erythorbic Acid, (+)-Catechin and (−)-Epicatechin

2010 ◽  
Vol 58 (2) ◽  
pp. 1004-1011 ◽  
Author(s):  
Andrew C. Clark ◽  
Jochen Vestner ◽  
Célia Barril ◽  
Chantal Maury ◽  
Paul D. Prenzler ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Oxidation Processes ◽  
Erythorbic Acid

Human Metabolism of L-Ascorbic Acid and Erythorbic Acid

1963 ◽  
Vol 81 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Jerry M. Rivers ◽  
Elizabeth D. Huang ◽  
Mary L. Dodds
Keyword(s):  
Ascorbic Acid ◽  
Human Metabolism ◽  
Erythorbic Acid

Stabilization of papain from papaya peels / Estabilización de la papaína de la cáscara de papaya

1998 ◽  
Vol 4 (3) ◽  
pp. 179-187 ◽  
Author(s):  
N. Espin ◽  
M.N. Islam
Keyword(s):  
Ascorbic Acid ◽  
Enzyme Activity ◽  
Protective Effect ◽  
Total Concentration ◽  
Sodium Ascorbate ◽  
Sodium Metabisulfite ◽  
Appreciable Effect ◽  
Original Activity ◽  
Before And After ◽  
Erythorbic Acid

Crude papain in papaya peels was stabilized before drying by the addition of various chemicals (ascorbic acid, sodium ascorbate, erythorbic acid, sodium erythorbate, sodium metabisulfite, sodium tetrathionate, 4-hexylresorcinol, t-butyl hydroquinone [TBHQ], rutin, α-tocopherol, trehalose, and sucrose). Chemicals were added to the ground papaya peels at 0, 0.12, 0.25, 0.5, 0.75, 1, 1.25, and 1.5% (w /w). Drying temperatures were 40, 55 and 60 °C. Enzyme activity was measured before and after drying by the casein digestion method. Percentage of enzyme activity retained (% EAR) was calculated by assigning a value of 100% EAR to fresh peels. Possible synergism between chemicals was also studied for a 1:1 ratio chemical/chemical at 1% total concentration. The highest % EAR was obtained at 55 °C for all chemicals except for sucrose and trehalose which showed their best effect at 40 °C. TBHQ rutin, α-tocopherol and 4-hexylresorcinol showed a destabilizing effect. Maximum protective effect occurred at 1% concentration. At this concentration sodium tetrathionate showed the best protective effect (90% EAR) followed by sodium metabisulfite (85% EAR), while both sodium ascorbate and sodium erythorbate retained 75% of the original activity. Ascorbic acid and erythorbic acid were 10% less effective than their corresponding sodium salts, possibly due to lower pH. Trehalose showed only 57 % EAR while sucrose failed to produce any appreciable effect. No synergistic effect was shown by any combination of chemicals.

scholarly journals Vitamin C Activity of Erythorbic Acid in Ascorbic Acid-Deficient Guinea Pigs.

1995 ◽  
Vol 41 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Emiko SUZUKI ◽  
Tadao KURATA ◽  
Mamoru TOMITA ◽  
Nobuhiko ARAKAWA
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Guinea Pigs ◽  
Erythorbic Acid
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