Oligomeric procyanidins of lotus seedpod inhibits the formation of advanced glycation end-products by scavenging reactive carbonyls

• Published in: Food chemistry 2013-06, Vol.138 (2-3), p.1493-1502
• Main Authors: Wu, Qian, Chen, Hengye, Lv, Zhejuan, Li, Shuyi, Hu, Bei, Guan, Yafei, Xie, Bijun, Sun, Zhida
• Format: Article
• Language: English
• Subjects: Advanced glycation end products (AGEs); Binding; Biological and medical sciences; Bovine serum albumin (BSA); Carbonyls; Catechin; Catechins; Dichroism; Fluorescence; Food industries; Free Radical Scavengers - chemistry; Free Radicals - chemistry; Fundamental and applied biological sciences. Psychology; Glycation End Products, Advanced - antagonists & inhibitors; Glycation End Products, Advanced - chemistry; Ingredients; Loteae - chemistry; Methylglyoxal; Milk and cheese industries. Ice creams; Oligomeric procyanidins of lotus seedpod (LSOPC); Plant Extracts - chemistry; Proanthocyanidins - chemistry; Procyanidins; Reactive carbonyl species; Scavenging; Seeds - chemistry
• ISSN: 0308-8146; 1873-7072
• DOI: 10.1016/j.foodchem.2012.10.111

► LSOPC inhibition rate is significantly higher than that of AG and can protect the structure of BSA effectively in the glycation process. ► The decreased amounts of MGO in LSOPC and catechin are higher than AG. ► The catechin-methylglyoxal adducts and LSOPC-methylglyoxal adducts were identified by LC-MS2. It has been reported that oligomeric procyanidins of lotus seedpod (LSOPC) is effective in the alleviation of Alzheimer’s disease and diabetes through its antioxidant and insulin-potentiating activities. This study investigated the anti-glycative activity of LSOPC in a bovine serum albumin (BSA)-glucose model. The level of glycation and conformational alterations were assessed by specific fluorescence, Congo red binding assay and circular dichroism. The results show that LSOPC has a significant anti-glycative activity in vitro and it can also effectively protect the secondary structure of BSA during glycation. LSOPC or catechin (a major constituent unit of LSOPC), were used to react with methylglyoxal. The structures of their carbonyl adducts were tentatively identified using HPLC-MS2. Their capacity to scavenge methylglyoxal suggested carbonyl scavenging as a major mechanism of antiglycation. Therefore, LSOPC could be helpful to prevent AGEs-associated diseases, and with the potential to be used as functional food ingredients.