摘要
针对玉米淀粉,研究应用单一载料介质(水)和混合载料介质(乙醇摩尔分数为0.24的乙醇-水溶液)的高压射流均质过程对颗粒微细化效果的影响。结果表明:在相同的操作条件下,以水为载料介质,玉米淀粉的晶体结构破坏不明显。而以乙醇-水溶液为载料介质,因空化作用加强,造成了气-液-固冲击作用增强,玉米淀粉颗粒的晶体结构明显受到破坏;扫描电镜分析发现在玉米淀粉颗粒表面发生明显的片状剥落,并附着碎屑;偏光显微镜分析表明淀粉的微晶结构被破坏;差示扫描量热法(DSC)结果证明淀粉颗粒原有的规则、密实晶体排列形式发生改变。
The effects of pure water and mixed （0.24% ethanol in water） media on the efficacy of high pressure jet homogenization to micronize corn starch granules were explored. Under the identical operating conditions, water was the least effective for damaging the crystalline structure of corn starch. However, in the aqueous ethanol medium, the crystalline structure of corn starch was seriously damaged due to the enhanced cavitation and thus the increased gas–liquid–solid impact. Scanning electron microscopic （SEM） observations indicated that surface flaking of corn starch granules happened with micro-debris adhering to the surface of the granules. Polarized light microscopic （PLM） analysis exhibited the damaged crystalline structure of corn starch. Differential scanning calorimetry （DSC） demonstrated that both the native granular structure and crystalline arrangement （compact） were altered.
出处
《食品科学》
EI
CAS
CSCD
北大核心
2013年第17期78-81,共4页
Food Science
基金
北京市属高等学校人才强教计划资助项目(PHR20110887
PHR201107110)
北京工商大学教学科研启动项目(jg125220)
关键词
高压射流均质
空化作用
玉米淀粉
结构
差示扫描量热法
high pressurejethomogenization
cavitation
cornstarch
structure
differential scanningcalorimetry（DSC）
