摘要
为实现柠檬醛的控制性释放,扩大其在食品工业中的应用范围,以β-环糊精（β-CD）为壁材,采用沉淀法制备柠檬醛包合物,探讨工艺条件对包合效果的影响,并对柠檬醛包合物结构和释放规律进行研究。正交实验表明,在包合温度为50℃、包合时间为60 min、柠檬醛与β-CD比例为1：11（w/w）的条件下包合物的包合率可达到85.62%。通过扫描电镜观察（SEM）,柠檬醛包合物呈均匀的不规则板状,颗粒直径在0.5-8μm。红外光谱（FT-IR）分析表明柠檬醛通过疏水键与β-CD作用形成包合物,热分析表明包合物已经形成一种新的物相。通过β-CD包合可以实现柠檬醛控制释放,随着温度的升高,释放速率加快,其释放规律符合一级动力学方程。同时也可有效减缓柠檬醛的氧化速度,提高其稳定性。
Citral has a variety of antimicrobial and antioxidantal properties. However, its volatility and lowphysicochemical stability limit its application as functional food ingredients. The aim of this study was toinvestigate the effects of inclusion process, physicochemical and release characteristics of citral inclusioncomplexes in fl-cyclodextrin （fl-CD）. The formation of the inclusion complex was demonstrated by differentanalytical techniques including Fourier transform-infrared （FT-IR） spectroscopy and scanning electronmicroscopy （SEM）. Orthogonal array design was used to investigate the effects of encapsulating temperature,encapsulating time and the ratio of citral to fl-CD on the inclusion result of the Citral Inclusion Complex. Theresults show that the encapsulating rate of citral can reach to 85.62% under the conditions of encapsulatingtemperature of 50℃, encapsulating time of 60min and the citral to fl-CD ratio of 1：11 （w/w）. SEM photographsshow that the inclusion complex is irregularly-shaped, plate-like crystal with diameter of 0.5-8 9m. FT-IRspectroscopy and thermal analysis indicate that a new solid phase is formed by hydrophobic interaction, and theinclusion complex has a crystal structure completely different from the original morphology of citral and fl-CD.Furthermore, the release of citral from the inclusion complex was determined at a temperature range from 4 to45 ℃. The release rate increases obviously with the increasing of storage temperature and the releasing processfollows the first order kinetic equation. These results indicate that encapsulation is a very effective method tomaintain the antioxidantal function of citral.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2014年第2期336-341,共6页
Journal of Chemical Engineering of Chinese Universities
基金
广东省教育部产学研结合项目(2012A090300010)
广东省自然科学基金项目(10451009001004396)
关键词
柠檬醛
Β-环糊精
包合物
控制性释放
citral
β-cyclodextrin
inclusion complex
controlled release
