In vitro starch digestion in sweet potato (Ipomoea batatas L.) flours

Chen, Gladys and Sopade, Peter (2013) In vitro starch digestion in sweet potato (Ipomoea batatas L.) flours. International Journal of Food Science and Technology, 48 1: 150-156. doi:10.1111/j.1365-2621.2012.03171.x

Author Chen, Gladys
Sopade, Peter
Title In vitro starch digestion in sweet potato (Ipomoea batatas L.) flours
Formatted title
In vitro starch digestion in sweet potato (Ipomoea batatas L.) flours
Journal name International Journal of Food Science and Technology   Check publisher's open access policy
ISSN 0950-5423
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1111/j.1365-2621.2012.03171.x
Volume 48
Issue 1
Start page 150
End page 156
Total pages 7
Place of publication West Sussex, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2013
Language eng
Formatted abstract
Summary: The kinetics of starch digestion in cryo- and hammer-milled sweet potato flours were investigated to reveal monophasic digestograms that were independent on particle size (80-390 μm), and suitably described (r2 > 0.98; P < 0.05) by a modified first-order model. Milling conditions significantly affected (P < 0.05) the particle size, salivary-gastric-digested starch and rate of starch digestion as the effective surface areas changed. The reciprocal of the rate of starch digestion (1/K, s) was significantly related to the square of the average particle size (size2, cm2), with the reciprocal of the slope (0.9-3.8 × 10-7 cm2 s-1) revealing diffusion-controlled digestion. The hammer-milled flours gave different digestion and functional parameters as frictional heat and glass transition phenomena played different roles in the overall structural changes in the flours. These parameters are discussed with starch digestion parameters in cereals and legumes to understand starch digestion in sweet potato.
Keyword Diffusion
First order kinetics
Fourier transform infra red spectroscopy
Monophasic digestogram
Particle size
Starch gelatinisation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 12 SEP 2012; Part of this paper was presented at the 15th Triennial Symposium of the International Society for Tropical Root Crops, International Potato Centre (CIP), Lima, Peru, 2–6 November 2009.

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