超声法制备的固体脂肪结晶颗粒的性质及其乳液稳定性分析  

Property Characterization and Emulsion Stability of Solid Lipid Particles Prepared by Ultrasonic Treatment

作　　者：张霞[1] 昝胜杰 李冰[1] 刘苑 焦文娟 罗鑫 李琳[3] ZHANG Xia;ZAN Shengjie;LI Bing;LIU Yuan;JIAO Wenjuan;LUO Xin;LI Lin(School of Food Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;Sericulture & Agri-Food Research Institute Guangdong Academy of Agricultural Sciences,Guangzhou 510640,Guangdong,China;Dongguan University of Technology,Dongguan 523808,Guangdong,China)

机构地区：[1]华南理工大学食品科学与工程学院,广东广州510640 [2]广东省农业科学院蚕业与农产品加工研究所,广东广州510640 [3]东莞理工学院,广东东莞523808

出　　处：《华南理工大学学报（自然科学版）》2021年第11期27-37,共11页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金-促进海峡两岸科技合作联合基金资助项目(U1905202);国家自然科学基金资助项目(31871758);广州市珠江科技新星专项(201806010144);广东省自然科学基金资助项目(2020A1515011304)。

摘　　要：作为一种新型的食品级皮克林颗粒,固体脂肪结晶颗粒(SLPs)因具有良好的生物可利用性和安全性、广泛的来源及产业化前景高等优势而受到广泛关注,控制SLPs的大小和形态对于制备稳定的SLPs皮克林乳液具有重要意义。文中以高熔点的固体脂肪——全氢化大豆油作为研究对象,选择吐温40(Tween 40,简称T40)为乳化剂,采用超声乳化法,通过改变超声处理条件(功率选取300、350、400和450 W;时间选取1、2、4和6 min)制备具有不同粒径、晶型以及形态的SLPs,并研究其对乳液粒径的影响规律。结果表明:未添加T40的SLPs的平均粒径在1.6~2.9μm之间,形态主要呈宽板条状,大小不一,晶型为α型;添加T40的SLPs的平均粒径在259~480 nm之间,形态呈棒状伴随球状,晶型为α型和β型共存;固定超声时间为4 min时,随超声功率的增加,未添加T40的SLPs的平均粒径整体增大,晶型和形态无明显变化,而添加T40的SLPs的平均粒径整体增大,β型和球状晶体增多;固定超声功率为350 W时,随超声时间的延长,未添加T40的SLPs的平均粒径逐渐减小,晶型和形态无明显变化,添加T40的SLPs的平均粒径显著减小(从480 nm减小至261 nm),但形态、晶型无显著性变化。可见,T40的添加降低了SLPs的粒径,改变了SLPs的晶型,促进了β型晶体的产生及晶体形态由板状向棒状和球状的转变。采用上述SLPs制备乳液发现:未添加T40的SLPs不能获得稳定的乳液,在体系上层出现块状絮凝物;而添加T40的SLPs则可以获得稳定的白色乳液,且不同粒径、晶型以及形态的SLPs形成的乳液粒径有所差异。As a new type of food-grade Pickering particles,solid lipid particles(SLPs)draw wide attention due to their good bioavailability,safety,wide sources and high industrialization prospects.Controlling the size and morphology of SLPs is of great significance for the preparation of stable SLPs Pickering emulsion.This paper took high-melting-point solid fat-fully hydrogenated soybean oil(FHSO)as the research object and Tween 40(T40)as emulsifier.SLPs with different particle size,crystal forms and morphologies were prepared with different ultrasonic power(300,350,400 and 450 W)and time(1,2,4,and 6 min).The influence of SLPs on emulsion droplet size was studied.The results show that SLPs without T40 is wide stip-like with the average particle size(Z-average)of 1.6~2.9μm,and the crystal form isα-form;SLPs containing T40 is rod-like and with spherical shape,its Z-average is 259~480 nm,and theα-form andβ-form crystals coexist.When the ultrasonic time is 4 min,Z-average of SLPs without T40 increase with the increase of ultrasonic power,with no obvious change in the crystal form and morphology,whereas Z-average of SLPs containing T40 increase gradually,andβ-form and spherical crystals increased.When the ultrasonic power is 350 W,Z-average of SLPs without T40 decrease with the increase of ultrasonic time,with no obvious change in the crystal form and morphology,whereas Z-average of SLPs without T40 decrease significantly(from 480 nm to 261nm),but the morphology and crystal form does not change significantly.It can be concluded that the addition of T40 reduces the particle size of SLPs,changes the crystal form of SLPs,and promotes the transformation of the crystal morphology from plate-like to rod-like and spherical.For the emulsions prepared with the above SLPs,it is found that the emulsions containing SLPs without T40 are unstable and massive flocs appears on the upper layer;while stable white emulsions were obtained with the SLPs containing T40,and the emulsion particle size changes with the SLPs particle sizes,polymorp

关 键 词：固体脂肪结晶颗粒 超声 粒径 形态 晶型 乳液 

分 类 号：TS201.2[轻工技术与工程—食品科学]