Effect of harvesting periods on the morphology and physico-chemical properties of trifoliate yam starches
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Abstract
Trifoliate yam starches from white and yellow cultivars were isolated and characterized by SEM,
granule size analysis, pasting properties and swelling characteristics at different harvesting
periods were studied. The starch yield ranged from 5.09 to 12.07%. White trifoliate yam had
the highest starch yield at 9 months and this was significantly different (p<0.05) from others.
The scanning electron micrograph revealed the presence of smooth surface granules with
polygonal granule size ranging from 2.58 to 3.58 mm in diameter. Amylose and starch contents
ranged from 14.65 to 17.44% and 40.73 to 63.34%, respectively. Peak viscosity ranged from 199.77
to 373.71 RVU, holding strength from 77.68 to 167.84 RVU, breakdown 96.79 to 217.14 RVU, final
viscosity 149.84 to 267.58 RVU, setback 50.34 to 112.27 RVU. White trifoliate yam starch at
7 months had the highest peak viscosity and breakdown but it exhibits high value in holding
strength at 8 months. White trifoliate yam starch harvested at 10 months had the highest swelling
power at 60 and 80 oC while at 90 oC, the highest value was recorded for starch at 11 months. The
yellow starch at 10 months had higher swelling power at 90 oC. Harvesting of trifoliate yam at
different periods produced starches that can be used for different purposes.
Description
Keywords
Cultivar / Harvesting periods, Starch, Swelling power, Trifoliate yam
Citation
(46) Akinoso, R. and Abiodun O.A (2013). Effect of harvesting periods on the morphology and physico-chemical properties of trifoliate yam starches. Starch/Starke 65: 753-761