Abstract
Ganoderma lucidum (G. lucidum) spores oil, which was extracted from G. lucidum spores with supercritical fluid CO2, contains a lot of unsaturated fatty acids (PUFAS). PUFAS in G. lucidum spores oil were oxidized easily, so it is important to protect G. lucidum spores oil and enhance its oxidation stability. In this paper, we investigated a way of protecting G. lucidum spores oil by microcapsulation with spray drying. Different combination types of wall materials were evaluated and the best choose was the gum Arabic (GA) and maltodextrin (MD) combination. Then, the effects of the emulsifying temperature, the wall materials concentration, and the ratio of oil to wall materials on the GA/MD microcapsules were investigated and the encapsulation efficiency (EE) was up to 83.57%. Gas chromatography was used to identify the components of fatty acids in original and GA/MD microcapsules. It showed that PUFAS were well retained and the content of it was up to 80.04%. Oxidation stability of G. lucidum spores oil was enhanced significantly. All results indicated that using GA and MD as composite wall materials could effectively protect for G. lucidum spores oil.
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