CHARACTERISATION OF MICROWAVED AND OVEN DRIED AERIAL YAM (Dioscorea bulbifera) STARCH
Loading...
Date
2017
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Native Starch was extracted from Aerial yam (Dioscorea bulbifera). The starch extracted was
dried using oven (at 300C for 24 hours) and microwaved for (30, 45, 60 seconds). Starch obtained
using different drying methods and conditions were analysed for their physicochemical, functional
properties and pasting characteristics. Results obtained showed that amylose, amylopectin, colour,
pH, bulk density, swelling power, least gelation capacity, oil absorption capacity, water absorption
capacity ranged from 26.87% to 32.77%, 66.89% to 73.12%, 40.35 to 53.65, 5.67 to 5.68, 0.568
to 0.704 g/cm3
, 7.26 to 8.43%, 9 to 15%, 112.89 to 121.98%, 164.39 to 306. 46% respectively.
The pasting properties ranged from 48.9 to 80.70C for pasting temperature, 10.9 to 20.50 minutes
for pasting time, 493 to 545 BU for peak viscosity, 355 to 823 BU for final viscosity, 315 to 341
BU for breakdown viscosity, 178 to 217 BU for setback viscosity. The effect of different drying
methods and conditions on the physico-chemical properties of the starch showed that oven dried
starch has a relatively low bulk density compared to microwaved starch, and this implies that oven
dried starch is better in terms of storability and transportation while higher bulk density of the
microwaved starch showed that it will be a greater ease of dispersibility and reduction in paste
thickness. The higher swelling power of the oven dried starch is a very important criteria for a
good quality starch and water intake of the starch. The oven dried starch had better gelation
capacity, because the lower the gel, the better the sample, and this is for starch granules to rise
when incorporating into food products. The oven dried starch had higher water absorption capacity
than the microwaved starch, in which it is suitable to entrap large amount of water during
processing. The oven dried starch had higher advantages than microwaved dried aerial yam starch.