摘要
研究了紫甘薯色素在不同溶剂中的溶解性和光谱学特性,pH值、温度、光照、H2O2、Vc和Fe3+、Al3+、Zn2+、Cu2+对其稳定性的影响。结果表明,紫甘薯色素为花色苷类色素,易溶于水、甲醇、乙醇等极性溶剂,不溶于丙酮、乙酸乙酯、乙醚和石油醚;紫甘薯色素在pH 1.0～3.0时保持稳定,色泽鲜红;随pH值升高,其解指数增大;温度超过60℃时,色素的稳定性迅速下降;连续光照8 d后色素的保存率为87%;色素的耐氧化和耐抗坏血酸较差;A13+和Zn2+有利于提高色素稳定性,且有一定程度的护色效果,而Fe3+对其有破坏作用。
The solubility in different solvents and the absorbance spectrum of purple sweet potato pigment （PSPP） from lpomoea batatas Lam were observed, and the effects ofpH value, temperature, lighting, 1-1202, Vc and Fe^3＋, Al^3＋, Zn^2＋, Cu^2＋ on PSPP stability were investigated. The result showed that PSPP is water soluble pigment. At the range of pH value from 1.0 to 3.0, PSPP water solution has a bright color and PSPP keeps sta- ble very well. With the increase of pH value, its degradation index increases. When temperature is over 60~C, the stability of PSPP decreases quickly. After accepting 8 day＇s successive lighting, the retention rate of PSPP was 87%. The pigment has a low stability to H202 and Vc. And the Al^3＋, Zn^2＋ could improve the stability of PSPP, but Fe^3＋ could damage it.
出处
《安徽农业大学学报》
CAS
CSCD
北大核心
2012年第3期407-411,共5页
Journal of Anhui Agricultural University
基金
安徽高等学校省级自然科学研究项目(KJ2011Z402)
苏北科技发展计划项目(BC2010424)
江苏高校优势学科建设工程项目共同资助
关键词
紫甘薯
色素
理化性质
稳定性
purple sweet potato
pigment
physico-chemical properties
stability
