摘要
以马铃薯淀粉、羧甲基纤维素钠为成膜基材,紫薯花青素作为指示剂制备指示膜。研究马铃薯淀粉和羧甲基纤维素钠的比例、花青素质量分数、甘油质量分数对指示膜性能抗拉伸强度、断裂伸长率、水溶性、颜色(a值)的影响,将指示膜性能综合分作为响应值,采用响应面法优化制备工艺参数,并对最优指示膜进行表征。结果表明,当马铃薯淀粉和羧甲基纤维素钠质量比6∶4、花青素质量分数0.5%、甘油质量分数0.6%时,指示膜的综合分为63.8,此时对应的抗拉伸强度为(21.48±0.12)MPa,断裂伸长率为(28.88±0.08)%,水溶性为(19.24±0.21)%,a值为4.95±0.02。通过傅里叶变换红外光谱分析、X射线衍射和扫描电镜分析各组分之间相容性好,截面平整光滑。将指示膜用于监测草鱼新鲜度,鱼肉的挥发性盐基氮值、pH值以及菌落总数分别达到21.55 mg/100 g、7.58、7.3(lg(CFU/g))时,指示膜由红色变为蓝紫色。研究结果可为指示膜用于食品货架期指示应用提供参考。
Indicator films were prepared through using starch(S)and sodium carboxymethyl cellulose(CMC-Na)as the film forming material and purple sweet potato anthocyanins(PA)as the indicator.The effects of S/CMC-Na ratio,anthocyanin concentration and glycerol concentration on the tensile strength(TS),elongation at break(EAB),water solubility and color(a value)of films were investigated.Using the comprehensive score of indicator film performance was as the response value,the process parameters were optimized by the response surface methodology,and the optimal indicator film was characterized.The results demonstrated that the optimum formulation of indicator films was determined as follows:starch/CMC-Na ratio 6:4,anthocyanin concentration 0.5%,and glycerol concentration 0.6%.The overall score of the indicator film prepared using the optimized formulation were the highest,up to 63.8,and it showed tensile strength of(21.48±0.12)MPa,elongation at break of(28.88±0.08)%,water solubility of(19.24±0.21)%,and a value of 4.95±0.02.The results of Fourier-transform infrared(FT-IR)spectroscopy,X-ray-differentiation(XRD)and scanning electron microscopy(SEM)indicated that the cross section of the SCA film was smooth and showed a good compatibility among the ingredients.Furthermore,the indicator film was used to monitor the freshness of grass carp.When the total volatile basic nitrogen(TVB-N)value,pH and total viable count reached 21.55 mg/100 g,7.58 and 7.3(lg(CFU/g)),respectively,the indicator film changed from red to blue-violet.These research results provide a basis for the application of indicator films for food shelf life evaluation.
作者
蒋光阳
侯晓艳
任文
吴贺君
黎杉珊
申光辉
陈安均
王章英
张志清
JIANG Guangyang;HOU Xiaoyan;REN Wen;WU Hejun;LI Shanshan;SHEN Guanghui;CHEN Anjun;WANG Zhangying;ZHANG Zhiqing(College of Food Science,Sichuan Agricultural University,Ya’an 625014,China;Crops Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510640,China)
出处
《食品科学》
EI
CAS
CSCD
北大核心
2020年第12期250-258,共9页
Food Science
基金
广东省应用型科技研发专项(2016B020233003)
校院合作项目(060H0304)。
关键词
指示膜
马铃薯淀粉
羧甲基纤维素
紫薯花青素
性能优化
结构表征
indicator film
potato starch
carboxymethyl cellulose
purple sweet potato anthocyanins
properties optimization
structure characterization
