Effect of pulsed electric fields assisted acetylation on morphological, structural and functional characteristics of potato starch

卷:192

Hong, Jing ; Chen, Rujiao ; Zeng, Xin-An ; Han, Zhong

S China Univ Technol

关键词: Potato starch;    Esterification;    Pulsed electric fields;    Response surface methodology;    Functional properties;   

DOI  :  10.1016/j.foodchem.2015.06.058

学科分类：食品科学和技术

【 摘 要 】

Pulsed electric fields (PEF)-assisted acetylation of potato starch with different degree of substitution (DS) was prepared and effects of PEF strength, reaction time, starch concentration on DS were studied by response surface methodology. Results showed DS was increased from 0.054 (reaction time of 15 min) to 0.130 (reaction time of 60 min) as PEF strength increased from 3 to 5 kV/cm. External morphology revealed that acetylated starch with higher DS was aggravated more bulges and asperities. Fourier-transformed infrared spectroscopy confirmed the introduction of acetyl group through a band at 1730 cm(-1). The optimum sample (DS = 0.13) had lower retrogradation (39.1%), breakdown (155 BU) and setback value (149 BU), while pasting temperature (62.2 degrees C) was slightly higher than non-PEF-assisted samples. These results demonstrated PEF treatment can be a potential and beneficial method for acetylation and achieve higher DS with shorter reaction time. (C) 2015 Elsevier Ltd. All rights reserved.