Spontaneous microencapsulation of geraniol by zein

eXPRESS Polymer Letters

I. V. W Ferreira¹ 

关键词: biodegradable polymers;    microencapsulation;    controlled release;    repellent;   

DOI  :  10.3144/expresspolymlett.2018.85

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

Geraniol was successfully micro-encapsulated with zein in a one-step phase separation process in which the zeinand geraniol were both initially dissolved in a water-ethanol mixture. Microcapsules were only formed at geraniol-to-zeinmass ratios above unity. This is ascribed to the relative solubility of the oil and protein in the solvent at the point of incipientphase separation: The geraniol must phase separate first before zein precipitation commences. The resultant oil droplets subsequentlyprovide the interfacial surfaces that act as nucleation sites for the precipitation of the amphoteric zein moleculeson continued dilution with water. The near spherical microcapsules formed under these conditions, comprised a foamedclosed-cell wall that enclose large internal cavities in which the geraniol was trapped. The highest particle yield, 85.3%, andoil encapsulation efficiency, 83.5%, were obtained at a geraniol to zein mass ratio of 3:1. The particle size distribution forthis system was log-normal with d10, d50 and d90 values of 10, 32 and 88 μm respectively. The temperature dependent geraniolrelease rate from these capsules followed power law kinetics with a release exponent of 0.80.

【 授权许可】

CC BY