Evaluation of rice genotypes for nutritional components and lipase activity in bran
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
To 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.
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