食品科学2021，Vol.42Issue(9)：55-63,9.DOI:10.7506/spkx1002-6630-20200417-227
挤压处理对豌豆淀粉的流变特性和体外消化率的影响
Effect of Extrusion Treatment on Rheological Properties and in Vitro Digestibility of Pea Starch
摘要
Abstract
This study investigated the influence of different extrusion conditions including pea starch moisture content (25％, 35％, 40％, 45％ and 55％), barrel temperature (50, 60, 70, 80 and 90 ℃) and screw speed (100, 120, 140, 160 and 180 r/min) on the in vitro starch digestibility and rheological properties of pea starch. Hydrolysis degree (HD) was measured using an in vitro digestion model, and rheological properties were determined through steady shear test, frequency sweep test and temperature sweep test. The results showed that after extrusion treatment, HD and the relative content of slowly digestible starch (SDS) increased whereas the relative content of resistant starch (RS) decreased. The maximum relative content of SDS of 34.41％ was obtained under the following extrusion conditions: moisture content 25％, barrel temperature 70 ℃ and screw speed 140 r/min. When screw speed increased to 180 r/min with moisture content 40％, barrel temperature 70 ℃, the relative content of RS reached the minimum value of 10.49％. Particle size was positively correlated with SDS relative content and consistency coefficient (K value) (r = 0.60 and r = 0.61, P < 0.05). The extruded pea starch suspension was pseudoplastic. In frequency and temperature sweep tests, storage and loss moduli increased with the degree of starch damage increasing caused by extrusion. The results showed that the extruded pea starch exhibited enhanced structure and elastic gel properties. Therefore, extrusion can affect the in vitro starch digestibility and rheological properties of pea starch, thereby improving food functionality and quality.关键词
挤压/豌豆淀粉/淀粉消化性/流变特性Key words
extrusion/pea starch/starch digestibility/rheological properties分类
轻工纺织引用本文复制引用
戚明明,任志尚,张光耀,贺壮壮,汪陈洁,张东亮,马成业..挤压处理对豌豆淀粉的流变特性和体外消化率的影响[J].食品科学,2021,42(9):55-63,9.基金项目
国家自然科学基金面上项目(31471676) （31471676）
招远工业技术研究院创新基金项目(2018-281) （2018-281）
