不同贮存条件对荔枝果实单宁的影响

Effect of Storage Condition on Condensed Tannin of Litchi chinensis

测定了不同干燥条件以及-20℃冰冻条件下乌叶荔枝果壳中缩合单宁可提取量,并对乌叶荔枝和兰竹荔枝果壳和果核中的缩合单宁含量进行分析对比.结果表明:4种不同条件下得出的缩合单宁含量具有显著差异,-20℃冰冻条件下的样品与鲜样缩合单宁含量差异不明显(p=0.562),而25、45和105℃烘干后得到的缩合单宁含量与鲜样存在明显差异(p<0.01),与鲜样相比,缩合单宁含量分别降低了37.09%、63.75%及85.47%.乌叶和兰竹两个品种的比较结果:乌叶荔枝的缩合单宁含量高于兰竹荔枝.结果表明,-20℃冰冻保存是一种较好的贮存荔枝壳和荔枝核的方法.

Litchi pericarp was used to study the effect of temperature of drying（25℃,45℃ and 105℃）on estimates of condensed tannin（CT）.These estimates were also made on freeze-dried samples.We made comparison of condensed tannin between Litchi chinensis cv wuye and Litchi chinensis cv lanzhu.Correlations were made between these variables.According with results,a significant differences（p〈0.01）occurred between the drying methods for condensed tannin.The responses of tannin to the altered temperature of drying（25℃,45℃ and 105℃） were that higher temperature resulted in lower tannin concentration of pericarp,decreased by 37.09%,63.75% and 85.47%.However,there was insignificant differences（p=0.562） between freeze-dried samples and fresh samples.The experiments for comparing condensed tannin,between wuye and lanzhu,showed that tannin content of wuye was higher than lanzhu.According with results,freeze-drying proved to be best for preserving the characteristics of the sample.