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. 2021 Nov 25;26(23):7137.
doi: 10.3390/molecules26237137.

Effects of Variety and Growing Location on Physicochemical Properties of Starch from Sweet Potato Root Tuber

Laiquan Shi  1   2 , Yibo Li  1   2 , Lingshang Lin  1   2 , Xiaofeng Bian  3 , Cunxu Wei  1   2
Affiliations

Effects of Variety and Growing Location on Physicochemical Properties of Starch from Sweet Potato Root Tuber

Laiquan Shi et al. Molecules. .

Abstract

Three sweet potato varieties with purple-, yellow-, and white-fleshed root tubers were planted in four growing locations. Starches were isolated from their root tubers, their physicochemical properties (size, iodine absorption, amylose content, crystalline structure, ordered degree, lamellar thickness, swelling power, water solubility, and pasting, thermal and digestion properties) were determined to investigate the effects of variety and growing location on starch properties in sweet potato. The results showed that granule size (D[4,3]) ranged from 12.1 to 18.2 μm, the iodine absorption parameters varied from 0.260 to 0.361 for OD620, from 0.243 to 0.326 for OD680 and from 1.128 to 1.252 for OD620/550, and amylose content varied from 16.4% to 21.2% among starches from three varieties and four growing locations. Starches exhibited C-type X-ray diffraction patterns, and had ordered degrees from 0.634 to 0.726 and lamellar thicknesses from 9.72 to 10.21 nm. Starches had significantly different swelling powers, water solubilities, pasting viscosities, and thermal properties. Native starches had rapidly digestible starch (RDS) from 2.2% to 10.9% and resistant starch (RS) from 58.2% to 89.1%, and gelatinized starches had RDS from 70.5% to 81.4% and RS from 10.8% to 23.3%. Two-way ANOVA analysis showed that starch physicochemical properties were affected significantly by variety, growing location, and their interaction in sweet potato.

Keywords: growing location; physicochemical properties; starch; sweet potato; variety.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Granule size distributions of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
Figure 2
Figure 2
Iodine absorption spectra of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
Figure 3
Figure 3
High temperature (A) and low temperature (B) of every day during growth stage of sweet potato in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
Figure 4
Figure 4
XRD spectra of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
Figure 5
Figure 5
FTIR spectra of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ) and Zunyi (ZY).
Figure 6
Figure 6
SAXS profiles of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ) and Zunyi (ZY).
Figure 7
Figure 7
RVA profiles of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
Figure 8
Figure 8
DSC thermograms of starches from root tubers of Ningzishu 1 (A), Sushu 16 (B), and Sushu 28 (C) in growing locations of Linquan (LQ), Rugao (RG), Yangzhou (YZ), and Zunyi (ZY).
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