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  1 - Enrichment of polyphenolic compounds from grape leaf extract (<i>Vitis vinifera</i> L.) using macroporous resin and investigating its adsorption kinetics and dynamics
  Nadia Sobhani Mahshad Shahriari Mohammad Hossein Jabbari Samad Nejad Ebrahimi
  10.30495/tpr.2023.1982639.1329
  Vitis vinifera L. with common name of grape is native to Mediterranean region and today is grown all over the world.آHere, the adsorption/desorption process on LXA-10 resin was investigated to enrich polyphenolic compounds of grape extract. The extract was obtained usin أکثر

  Vitis vinifera L. with common name of grape is native to Mediterranean region and today is grown all over the world.آHere, the adsorption/desorption process on LXA-10 resin was investigated to enrich polyphenolic compounds of grape extract. The extract was obtained using ultra-sound-assisted probe with water and ethanol (50:50) with an extraction yield of 26.4%. The pH value of the extract for maximum adsorption was optimized at 3.26. According to the findings of this study, the kinetic adsorption fitted well with pseudo-second-order model (R2=0.99). Moreover, the dynamic study revealed the adsorption capacity and required solvent for polyphenolic desorption being 42 mL and six-bed volume (BV), respectively. In the enriched powder, the amount of quercetin-O-3-glucuronide and quercetin-O-3-glucoside increased from the ranges of 19.43 to 45.92 mg.g-1 and 41.244 to 72.88 mg.g-1, respectively. The antioxidant activity of enriched polyphenols also increased from 252.37 in initial grape extract to 408.03 mM iron (II).mg-1. تفاصيل المقالة