大孔吸附树脂对刺梨果汁单宁脱除及其色泽的影响

为有效脱除刺梨果汁中的单宁和色素，提高刺梨果汁品质，选用4 种大孔吸附树脂对刺梨果汁进行脱色和脱单宁处理。结果表明：与其他3 种树脂相比，LX-60大孔吸附树脂的吸附效果最好，当树脂用量为4.0 g时，脱色率为88.18%，单宁脱除率为44.12%，且LX-60树脂的吸附等温线符合Freundlich方程。大孔吸附树脂吸附后刺梨果汁总糖和总酚含量分别显著下降至79.47%和70.18%，可溶性固形物、可滴定酸及VC的保留率分别为81.40%、84.62%和96.48%。在动态吸附实验中，刺梨果汁在大孔吸附树脂上样量为5 倍柱体积、流速为3.3 mL/min的条件下，LX-60大孔树脂对色素类物质和单宁的脱除率分别为71.56%和21.17%，脱除效果较好。因此，LX-60大孔吸附树脂能够有效脱除刺梨果汁中的单宁和色素类物质并改善品质。

Decolorization and Tannin Removal Efficiency of Rosa roxburghii Tratt Juice with Macroporous Adsorbent Resins

In order to effectively remove the tannin and pigment present in Rosa roxburghii Tratt juice and improve its
quality, four kinds of macroporous adsorbent resins including LSA-600, LX-920, LX-60 and LX-8 were studied. Results
showed that LX-60 exhibited the best absorption performance and the removal rate of pigment and tannin were 88.18% and
44.12%, respectively with 4.0 g of LX-60. Moreover, the absorption isotherm of LX-60 fitted to the Freundlich equation.
After adsorption, the contents of polyphenols and total sugar in Rosa roxburghii Tratt juice significantly decreased to 79.47%
and 70.18%, while the retention rates of soluble solids, titratable acidity and vitamin C were 81.40%, 84.62% and 96.48%,
respectively. When 5 bed volume (BV) of the fruit juice was loaded onto the column at a flow rate of 3.3 mL/min, LX-60
removed 71.56% pigment and 21.17% tannin. Therefore, LX-60 was effective to remove tannin and pigment from Rosa
roxburghii Tratt juice and therefore could improve its quality.