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Citation: ZHANG Jing, GUO Panpan, LI Huili, SHEN Shigang, DOU Haiyang. Separation and characterization of millet starch based on asymmetrical flow field-flow fractionation[J]. Chinese Journal of Chromatography, ;2020, 38(2): 169-176. doi: 10.3724/SP.J.1123.2019.05014 shu

Separation and characterization of millet starch based on asymmetrical flow field-flow fractionation

ZHANG Jing ¹ ,
GUO Panpan ¹ ,
LI Huili ² ,
SHEN Shigang ^1,, ,
DOU Haiyang ^1,2,,

1.
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China;
2.
College of Medicine, Hebei University, Baoding 071000, China

Corresponding author: SHEN Shigang, DOU Haiyang,
Received Date: 13 May 2019

Fund Project: Key Project of Hebei Education Department (No. ZD2019009)

A method based on asymmetrical flow field-flow fractionation (AF4) coupled with a multi-angle light scattering detector and a differential refractive detector was developed for the separation and characterization of millet starch. In this study, the effects of sample loading, cross-flow rate, half-life, and ionic strength and pH value of the carrier liquid on the AF4 analysis of millet starch were investigated. In addition, the molecular structure of millet starch was determined under the optimum conditions. The optimized operation conditions for the AF4 analysis of millet starch were as follows:injection mass concentration, 0.50 g/L; injection volume, 50 μ L; cross-flow rate, 1.2 mL/min; half-life, 3 min; and the carrier liquid, demonized water containing 10 mmol/L pH 7.00 NaNO₃ (add 3 mmol/L NaN₃). The method developed in this study showed good reproducibility. The relative standard deviations for the radius of gyration (R_g) and molar mass (M_w) were 3.4% and 7.0%, respectively.
- asymmetrical flow field-flow fractionation (AF4),
- millet starch,
- separation
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