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Microencapsulation of xanthan gum based on palm stearin/beeswax matrix as wall system
Author(s) -
Ding Baomiao,
Li Chenbiao,
Pan Minhsiung,
Chiou Yishiou,
Li Zhenshun,
Wei Shudong,
Yin Xiaoli
Publication year - 2019
Publication title -
journal of food process engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 45
eISSN - 1745-4530
pISSN - 0145-8876
DOI - 10.1111/jfpe.13102
Subject(s) - beeswax , xanthan gum , differential scanning calorimetry , chemistry , palm stearin , phase inversion , chemical engineering , materials science , chromatography , rheology , food science , palm oil , composite material , membrane , wax , biochemistry , physics , engineering , thermodynamics
Xanthan gum microcapsules (XGMC) were prepared by phase separation method based on palm stearin/beeswax (PS/BW) systems. XG microcapsules with high encapsulation efficiency were obtained at the preparation conditions of PS‐to‐BW ratio 7:3 and core‐to‐wall ratio 10:10. The inverted micrograph showed that the shapes of XGMC were mainly spherical, and the particle sizes of XGMC were chiefly distributed in the range from 40 to 300 μm. The XGMC curve of differential scanning calorimetry (DSC) illustrated that two peaks appeared at around 40 and 60°C, and the two temperatures were in accordance with the melting points of PS and BW, respectively. Compared with that of XG, the hygroscopicity of XG in microcapsules was obviously decreased under medium and high humidity conditions. Viscosity measurements showed that XGMC could be destructed and XG was completely released from microcapsules at temperature above 65°C. The XG released from microcapsules could more fast hydrate than XG, and “fish‐eye” would not be formed. Microencapsulation could be an effective method to protect XG from high hygroscopicity, to promote the polysaccharide hydration process, and to prevent the “fish‐eye” formation. Practical Applications XG as a hydrophilic polysaccharide is able to strongly absorb moisture and form agglomerates during storage. Moreover, the gum tends to produce “fish‐eye” formation during hydration process. These shortcomings are not propitious for XG applications in the food processing industry. Microencapsulation is usually employed to improve the physicochemical properties of active ingredients. XG was encapsulated into palm stearin/beeswax matrix using phase separation method. The hygroscopicity of XG was reduced significantly after microencapsulation, and the “fish‐eye” formation was also effectively prevented. The hydration rate and efficiency of XG after microencapsulation were obviously enhanced. The XG microcapsules obtained in this work will promote the application in food industry and increase the economic value of XG. In addition, the system of palm stearin/beeswax could be adequately developed as effective wall materials.