Effects of Temperature, Illumination, and Sodium Ascorbate on Browning of Green Tea Infusion

다국어 초록 (Multilingual Abstract)

Browning of tea infusion is an obstructive factor influencing shelf life of ready-to-drink green tea. Effects of temperature and illumination on the browning of green tea infusion were investigated. It was shown that both elevated temperature and illumination led to the browning of green tea infusion, but temperature had greater effect on infusion color and level of catechins than illumination. The levels of unoxidized catechins such as (-)-epigallocatechin gallate (EGCg), (-)-epigallocatechin (EGC), (-)-epicatechin gallate (ECg), (-)-epicatechin (EC), and total catechins remaining in the tea infusion were significantly correlated to color parameters of the tea infusion. Sodium ascorbate inhibited the infusion browning by suppressing the oxidation of tea catechins and it is considered to be a more suitable preservative for prolonging shelf life of ready-to-drink green tea than ascorbic acid because it has less effect on tea taste. The effects of temperature and illumination on the epimerization of catechins were also discussed.

목차 (Table of Contents)

• Abstract
• Introduction
• Materials and Methods
• Results and Discussion
• Acknowledgment
• References

참고문헌 (Reference)

1 Wang LF, "Various antibrowning agents and green tea extract during processing and storage" 27 : 213-225, 2003

2 Wang LF, "The compounds contributing to the greenness of green tea" 69 : S301-S305, 2004

3 Liang H, "Tea extraction methods in relation to control of epimerization of tea catechins" 87 : 1748-1752, 2007

4 Chen ZY, "Stabilizing effect of ascorbic acid on green tea catechins" 46 : 2512-2516, 1998

5 Ok-Hee Lee, "Sensory Characteristics and Consumer Acceptability of Various Green Teas" 한국식품과학회 17 (17): 349-356, 2008

6 Seto R, "Preparation of epimers of tea catechines by heat treatment" 61 : 1434-1439, 1997

7 Wan XC, "New type of tea pigment from the chemical oxidation of epicatechin gallate and isolated from te" 74 : 401-408, 1997

8 li-feiwang, "Interaction of flavanols in green tea extract during heat processing and storage" 한국식품과학회 11 (11): 608-612, 2002

9 Mcevily AJ, "Inhibition of enzymatic browning in foods and beverages" 32 : 253-273, 1992

10 Kim ES, "Impact of heating on chemical compositions of green tea infusion" 103 : 1263-1267, 2007

11 Jensen JM, "Enhancement solution effects on shelf-life, color, and sensory characteristics of pork chops during retail display" 26 : 271-283, 2003

12 Wang LF, "Effect of heat processing and storage on flavanols and sensory qualities of green tea beverage" 48 : 4227-4232, 2000

13 Nicoli MC, "Effect of enzymatic and chemical oxidation on the antioxidation capacity of catechin Model systems and apple derivatives" 48 : 4576-4580, 2000

14 Roberts EAH, "Economic importance of flavonoid substances: Tea fermentation" Pergamon Press, Oxford, UK 468-512, 1962

15 Clydesdale FM, "Color perception and food quality" 14 : 61-74, 1991

16 Jung Hyen Jang, "Assessing Geographic Origins of Green Teas Using Instruments" 한국식품과학회 17 (17): 1016-1020, 2008

17 Jong-Sang Kim, "Antiproliferative and Anticarcinogenic Enzyme-Inducing Activities of Green Tea Seed Extract in Hepatoma Cells" 한국식품과학회 15 (15): 914-919, 2006

18 Karori SM, "Antioxidant capacity of different types of tea products" 6 : 2287-2296, 2007