Abstract
Highland barley starch (HBS), as a carbohydrate shell material with excellent performance in microcapsule applications, has rarely been reported. In the present study, three different microcapsules (CEO-SWSM, CEO-PM, and CEO-UM) were synthesized successfully via saturated aqueous solution method, molecular inclusion method and ultrasonic method, respectively, using HBS as shell material coupled with cinnamon essential oil (CEO) as the core material. The potential of HBS as a new shell material and the influence of synthetic methods on the performance of microcapsules, encapsulation efficiency (EE), yield, and release rate of CEO-SWSM, CEO-PM, and CEO-UM were determined, respectively. The results confirmed that CEO-PM had the most excellent EE (88.2%), yield (79.1%), as well as lowest release rate (11.5%, after 25 days of storage). Moreover, different kinetic models were applied to fit the release process of these three kinds of microcapsules: CEO-SWSM, CEO-PM, and CEO-UM had the uppermost R-squared value in the Higuchi model, the zero-order model, and the first-level model, respectively. Over all, this work put forward a novel perspective for the improved encapsulation effect of perishable core materials (e.g., essential oil) for the food industry.
Highlights
Cinnamon (Cinnamomum cassia Presl) is a natural plant widely cultivated in tropical and subtropical regions [1]
In the cinnamon essential oil (CEO)-PM, and CEO-UM, all diffraction peaks belong to Highland barley starch (HBS) and the intensity of all diffraction peaks pattern of CEO-SWSM, CEO-PM, and CEO-UM, all diffraction peaks belong to HBS and the belonging to the A-type crystalline structure of HBS had decreased to various degrees, among them, intensity of all diffraction peaks belonging to the A-type crystalline structure of HBS had decreased
In the 1 H NMR spectrum of methanol-D, which soaked the microcapsules for 3 days, only the impurity peaks belonging to pure water were observed, which indicated that the CEO was encapsulated theencapsulated microcapsulesinby without any by leak, thatwithout is to say, HBS
Summary
Cinnamon (Cinnamomum cassia Presl) is a natural plant widely cultivated in tropical and subtropical regions [1]. As the previous research reported, there are several advantages of highland barley starch (HBS), such as good film forming performance, low immunogenicity, outstanding freeze-thaw stability, high solubility, excellent emulsifying stability, low viscosity, favorable stability, good biocompatibility, biodegradable, non-toxic side effects, and so on [41,42,43]. These superiorities will contribute to embedding core materials and retaining their physicochemical properties. This work provides a novel shell material for microcapsule of CEO; on the other hand, it provides a basis for microcapsules to more effectively control the release of core materials
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