脱氢醋酸钠的用量对椰花汁采后品质变化的影响

Effect of Sodium Dehydroacetate on Quality Change of Postharvest Coconut Inflorescence Sap

研究了不同浓度的脱氢醋酸钠(sodium dehydroacetate,SDA)对椰子花序汁液(coconut inflorescencesap,CIS)采后品质变化的影响。结果表明:CIS采集后,空白组中的折光糖度、还原糖、乙醇、总酸和挥发酸的含量均有显著变化,而添加SDA则可显著抑制这些指标含量的变化。在自然发酵第7d,空白组和SDA浓度分别为0.02%,0.03%和0.04%的试验组中折光糖度分别为6.00%,11.60%,12.2%和12.4%,总酸度分别为3.91,1.51,1.05和0.95g/100mL;在同一天内SDA浓度为0.02%的试验组乙醇含量显著高于另外2个试验组;挥发酸除第7d中SDA浓度为0.02%的试验组比另2个试验组的显著高,其他3个试验组所测数据差异均不显著;3个试验组中的还原糖含量变化规律不明显,表明0.02%的SDA对CIS已有显著的保鲜效果。

Postharvest coconut inflorescence sap （CIS） was added with sodium dehydroacetate （SDA） at different levels to observe its quality change. The refractive sugar, reducing sugar, ethanol content, total acidity and violate acid were changed obviously in the CIS collected and naturally fermented, but evidently inhibited in the CIS samples added with SDA. At the 7th day of natural fermentation, the blank control and the SDA treatments at the levels of 0.02%, 0.03% and 0.04% contained respective refractive sugar of 6.00%, 11.60%, 12.2% and 12.40%, and respective total acidity of 3.91, 1.51, 1.05, 0.95 g/100 mL. The 0.02% SDA treatment had higher ethanol content than the other 2 treatments at the same day, and the 0.02% SDA treatment contained obviously higher volatile acid than the other 2 treatments at the 7^th day, except which no difference were observed among the 3 treatments and the control. The change of reducing sugar was not obvious. The results showed that the 0.02% SDA treatment had obviously higher positive effect on preservation of the CIS.