【摘要】 用线性升温法研究半院氨酸对抗坏血酸稳定性的影响,紫外检测波长为243.5 nm。实验结果表明,半胱氨酸能增加抗坏血酸的稳定性。在 20℃,PH 2.0的条件下,含有 2％和 3％的半胱氨酸的抗坏血酸溶液降解反应的活化能分别为 84.814 kJ/mol和 102.834 kj/mol,有效期分别为1. 015 a和 3.154 a。更多还原

【Abstract】 The linear nonisothermal method was applied to study the effect of cysteine on the stability of ascorbic acid in water (pH2. 0), UV detection at 243. 5 nm. The results showed that the stability of ascorbic acid was increased by cysteine. In the presence of cysteine, the activation energy was 84. 814 kJ/mol (2%Cys)and 102. 834 kJ/mol(3%Cys), the term of validity was 1. 015a and 3. 154a at 20 C.更多还原