Ramli, Nur Syazila and Md Zin, Noor Hasniza
(2018)
Alpha-amylase inhibitory activity of inhibitor proteins in
different types of commercial rice.
Science Heritage Journal (GWS), 2 (2).
pp. 27-29.
ISSN 2521-0858
E-ISSN 2521-0866
Abstract
The inhibition of α-amylase enzyme by the inhibitor proteins extracts of all the three types of commercial rice, white
rice (WR), brown rice (BR) and glutinous rice (GR) were investigated. Among the three types of rice, the BR has
significantly the highest concentration of the inhibitor protein (0.030 ± 0.002 mg/ml) compared to glutinous rice
(0.006 ± 0.001 mg/ml) and white rice (0.005 ± 0.001 mg/ml). In term of the percentage of inhibition of the α-
amylase enzyme of the Aspergillus oryzae, the brown rice shows the highest inhibition (61.22 %) among the three
types of rice with the lowest maltose liberated. The acarbose (0.1 mg/ml) which was used as a positive control
represent the highest inhibition of the α-amylase enzyme inhibitor among all of the tested samples. Even though
inhibitor protein extract of BR is possessed lower ability to inhibit the α-amylase, yet it still can be one of the best
option and alternative for the Diabetes Mellitus patients for their daily consumption compared to the WR and GR.
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