Sharma, NeerjaRajinder Kaur2018-02-022018-02-022017http://krishikosh.egranth.ac.in/handle/1/5810040257To achieve the objective of the evaluation of rice genotypes for nutritional components and lipase activity in bran, sixteen rice genotypes including ten non-basmatis and six basmatis were used in the present study. Significant variation in ash (5.29-14.43%), crude protein (11.38-20.25%), crude fat (16.43-21.88%) and crude fibre (3.24- 14.01%) was observed in bran from rice genotypes under evaluation. The bound phenolic content (BPC) was 39.19 percent higher than free phenolic content (FPC), while significant variation was seen in total phenolic content (TPC, 11.59-28.73 mg g-1 DW), flavonoid (0.17-2.32 mg g-1 DW) and o- dihydroxyphenol (0.023-0.112 mg g-1 DW) content. Compared to non- basmatis, bran from basmati varieties showed about 14% higher anthocyanin content. Significant variations were observed in the content of proanthocyanidins (0.86-7.75 mg g-1 DW), phytate (21.6-36.7 mg g-1 DW), tocopherols (0.11-0.31 mg g-1 DW) and free amino acids (3.38-12.20 mg g-1 DW). Bran from rice genotypes under evaluation showed a high DPPH free radical scavenging activity (72.46-92.59%). Wide variations in reducing power (1.06-2.47 mg g-1 DW), metal chelating power (13.61-94.36 %), free radical ABTS.+ scavenging activity (0.54-1.31 mM g-1 DW), and ferric reducing ability power (8.31-20.15 µM Fe(II)g-1DW) of rice bran extracts were seen. Accumulation of free fatty acids after 48 hours of storage ranged from 0.36-1.20 mM g-1 DW. Wide differences in endogenous rice bran lipase activity (0.49-2.77 µmoles of pNP produced min-1 mg-1protein) were observed. This knowledge about on the variations in phytochemical components, antioxidant potential and lipase activity among rice bran from different genotypes would enable the breeders to produce rice genotypes with improved phytochemical levels, high antioxidant potential and low lipase activity.ennullThesis