干热处理对不溶性大豆纤维乳化特性的影响  

Effect of dry heat treatment on emulsifying properties of insoluble soybean fiber

作　　者：赵秀杰 黄丽华 罗怀楠 蔡勇建 赵谋明[1] 赵强忠[1] ZHAO Xiu-jie;HUANG Li-hua;LUO Huai-nan;CAI Yong-jian;ZHAO Mou-ming;ZHAO Qiang-zhong(School of Food Science and Technology,South China University of Technology,Guangzhou,Guangdong 510640,China)

机构地区：[1]华南理工大学食品科学与工程学院

出　　处：《食品与机械》2019年第11期22-27,98,共7页Food and Machinery

基　　金：“十三五”国家重点研发计划项目（编号：2016YFD0400803）;国家自然科学基金资助项目（编号：31571883,31701539)

摘　　要：采用碱处理(AK)、烘烤-碱处理(HA)、碱处理-烘烤(AH)、碱处理-双螺杆挤压(AT)处理脱脂豆渣制备不溶性大豆纤维(ISF),以自制ISF制备O/W型乳浊液,研究干热处理对ISF乳化特性的影响。结果表明:ISF乳浊液ζ-电位依次为:AH-ISF>AK-ISF>AT-ISF>HA-ISF,储能模量(G’)依次为:AT-ISF>AH-ISF>HAISF>AK-ISF;4种乳浊液均呈现剪切稀化特性,干热处理ISF乳浊液tanδ<1;乳浊液贮藏期间,AK-ISF的粒径(ΔAK-ISF=1.916)和表观黏度(ΔAK-ISF=3.898)增幅均最大,而干热处理则改善了ISF乳浊液的贮藏稳定性,以AT-ISF最好。表明干热处理显著改变了ISF乳浊液的表面电荷分布,乳浊液形成了以弹性为主的类凝胶网络结构,且静电相互作用和类凝胶网络结构是干热处理ISF乳浊液稳定的主要因素。Different treatments of alkali(AK),heating alkali(HA),alkali heating(AH),and alkali twin-screw extrusion(AT)were employed to prepare insoluble soybean fiber(ISF)from defatted okara.The effect of dry heat treatment on the emulsifying properties of ISF was studied by the O/W emulsions prepared by self-made ISF.Theζ-potential of ISF emulsions sorted by magnitude were AH-ISF>AK-ISF>AT-ISF>HA-ISF,and the storage modulus(G′)were AT-ISF>AH-ISF>HA-ISF>AKISF.Four kinds of emulsions all exhibited shear-thinning properties,and tanδof the dry heat treated ISF emulsions were less than 1.During emulsion storage.AK-ISF was found to have the largest increasing ranges in both particle size (ΔAK-ISF=1.916)and apparent viscosity(ΔAK-ISF=3.898),while the storage stability of emulsions was enhanced by dry heat treated ISF,and ATISF was the best one.These results indicated that the dry heat treatment significantly changed the surface charge distribution of the ISF emulsions and emulsions formed a gel-like network structure dominated by elasticity.Furthermore,the electrostatic interaction and gel-like network structure were the main factors contributing to the stability of dry heat treatment ISF emulsions.

关 键 词：不溶性大豆纤维 干热处理 乳浊液 贮藏稳定性 

分 类 号：TS2[轻工技术与工程—食品科学与工程]