Comparative Analysis of Physicochemical and Pasting Properties between Traditional and High Yielding Rice Varieties of Bangladesh

Abstract

The physicochemical and pasting (rheological) properties between Bangladeshi traditional and high yielding varieties (HYV) of indica rice have been compared. Seven representatives of traditional indica parboiled rice namely Dudhkolom, Magursail, Ashiana, Kajalsail, Dadkhani, kataribhog, Jalidhan, and seven high yielding varieties namely BRRI 22, BRRI 23, BRRI 28, BRRI 29, BRRI 31, BRRI 40, and BRRI 41 have been chosen based on their popularity and availability. The flour particle size obtained after grinding ranged from 204.05 µm (Ashiana) to 311.85 µm (Magursail) for traditional variety and 224.87 µm (BRRI 31) to 281.70 µm (BRRI 28) for HYVs. Amylose content (AC) ranged from 21.18 % (Kajal sail) to 25.81 % (Dudhkolom) for traditional variety and 22.16 % (BRRI 31) to 30.37 % (BRRI 22) for HYVs. The protein contents of traditional varieties lie between 6.09 % (Dudhkolom) to 8.76% (Jolidhan) and that of HYV lie between 7.82 % (BRRI 41) to 9.09 % (BRRI 31). Gel consistency test reveals that all the varieties have a soft gel consistency. Rheological properties namely peak viscosity (PV), trough viscosity (TV), breakdown viscosity (BV), final viscosity (FV) and setback viscosity (SV) have been determined for all the fourteen samples. It has been found that all of these parameters were comparable between the analyzed traditional and HYVs.