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자료유형
학술저널
저자정보
저널정보
한국식품영양과학회 Journal of Food Science and Nutrition Journal of Food Science and Nutrition Vol.6 No.2
발행연도
2001.6
수록면
83 - 86 (4page)

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The autoxidation reaction of L-ascorbic acid (AsA), and, particularly, the oxidation rates of AsA in the presence of Fe(Ⅲ) or Cu(Ⅱ) ions were determined in water and methanol. UV spectral measurement (at 265 ㎚) and HPLC were used to determine the remaining amounts of AsA in water and methanol, respectively. It was found that, in the presence of metal ions, the autoxidation rate of AsA was significantly affected by the kinds of solvents used, and also by the kinds of metal ions present. Moreover, the first-order rate constants for the oxidation of non-dissociated AsA compared with dissociated-AsA were investigated. It was confirmed that the oxidation of AsA was more accelerated in the dissociated form of AsA than in the non-dissociated form of AsA in either with Fe(Ⅲ) or Cu(Ⅱ). It was also found that the Cu(Ⅱ) at a concentration of 0.1 μM had a more significant effect on the first-order rate constants for the autoxidation of AsA than Fe(Ⅲ) at 5 μM.

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Abstract

INTRODUCTION

MATERIALS AND METHODS

RESULTS AND DISCUSSION

SUMMARY

ACKNOWLEDGEMENTS

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