The characteristics of starch granules are important for product identification and quality analysis. This study used geometrical morphometrics to analyze wheat, rice, corn, potato, and yam starch granules. The results showed that wheat starch granules had circular shapes with (19.90±7.19) μm diameter. Both rice and corn starches had polygonal shapes, and their diameters were (5.08±1.08) μm and (11.40±3.50) μm, respectively. In addition, the shapes of potato and yam starch granules were elliptical and their diameters were (11.94±8.56) μm and (21.86±3.50) μm, respectively. The contour curves of rice and corn starch granules were tortuous while other starch granules were smoother. The wavelet analysis showed that except for rice starch granules, other granules all displayed significant periodic variations at 6-8 angular step scales. Moreover, the five food starches showed significantly different wavelet spectra and possessed 3, 5, 2, 4, and 3 complete spectral value closures, respectively. Principal component analysis showed that the cumulative variance of the two main components was 83.07%, and the five food starch granules clearly distinguished from each other, and a discriminant equation for food starch granule identification was established. In conclusion, geometric morphometrics offers quantitative identification to discriminate different food starch granules, and therefore it has application potential in food quality inspection.
WAN Zhiwei
,
LI Mingqi
,
JIA Yulian
,
JIANG Meixin
. Analysis of five food starch granules based on geometric morphometrics[J]. Food and Fermentation Industries, 2019
, 45(12)
: 222
-226
.
DOI: 10.13995/j.cnki.11-1802/ts.019212
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