Abstract:

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.

Key words: macroporous adsorbent resins, Rosa roxburghii Tratt, decolorization, tannin, adsorption isotherm