[关键词]
[摘要]
褐变是影响荔枝销售的主要因素之一,为掌握荔枝颜色变化与荔枝品质指标的关联关系,以“桂味”为试验材料,采用带孔PE袋进行包装,分别将其贮藏于气调和冷藏2种贮藏保鲜模式30 d,研究了荔枝果皮色差a*值与其他品质指标的变化关系,并拟合成线性关系式。研究结果表明:气调模式比冷藏模式有利于抑制荔枝果皮色差a*值变化,荔枝果皮色差a*值分别从35.0降至28.97 和20.96;荔枝果皮色差a*值与果皮失水率、褐变指数、花色素苷含量、果实失重率以及感官评定值成线性关系,平均相关系数为0.8609;荔枝果皮色差a*值与其电导率、pH值线性关系不显著,平均相关系数分别只有0.5392和0.4977;冷藏模式下,除感官评定值外,荔枝果皮色差a*值与其他品质指标的线性相关性要高于气调模式,平均相关系数分别为0.9465和0.7752。研究结果对研究以果皮色差预测荔枝贮藏期及货架期具有一定的参考价值。
[Key word]
[Abstract]
Browning is one of the main factors affecting sales of litchi fruit. In order to understand the relationship between color change and other quality indicators of litchi fruit, ‘Guiwei’ litchi fruit was chosen for this study. The fruit was packaged in PE packaging bags with holes and stored under cold storage and controlled atmosphere storage conditions, for 30 days. The change of color index a* values of litchi pericarp and other quality indicators were studied, and the data were fitted to a linear relationship. The results showed that controlled atmosphere storage was advantageous in suppressing the change of color index a* value of litchi pericarp, which decreased from 35.0 to 28.97 under controlled atmosphere conditions, whereas it decreased to 20.96 under cold storage conditions. In addition, a* value of litchi pericarp showed a linear relationship with the rate of pericarp moisture loss, browning index, anthocyanin content, weight loss rate, and sensory evaluation score, with an average correlation coefficient of 0.8609. However, a* value of litchi pericarp did not show a significant linear relationship with conductivity and pH value, while the average correlation coefficients were 0.5392 and 0.4977, respectively. Under cold storage conditions, expect for sensory evaluation value, a* value of litchi pericarp showed better linear correlations with other quality indicators when compared to those under controlled atmosphere conditions, where the average correlation coefficient was 0.7752 under controlled atmosphere conditions, but was 0.9465 under cold storage conditions. The results of this study provide a reference for predicting litchi shelf life by color index of the pericarp.
[中图分类号]
[基金项目]
国家科技支撑计划课题(2013BAD19B01)