以麦芽糊精为壁材,采用喷雾干燥和剪切技术,制备红曲色素微胶囊。针对综合特性指标(差角、休止角、分散度)、粒径分布、微观结构、吸光度及热力学特性,分析剪切作用对喷雾干燥红曲色素粉综合特性的影响。结果表明,剪切后,喷雾干燥制备的红曲色素粉分布较均匀,粒径由7.31 μm减小至6.397 μm,分散度由13.5降低至11,样品表面圆滑饱满,破残率低,有效降低红曲色素粉的扬尘性。经剪切后,喷雾干燥制备的红曲色素粉的热焓值与放热减少,提高了热稳定性,并且剪切未显著影响红曲色素粉的色价。该研究为明确喷雾干燥制备红曲色素粉物性学提供数据,为相关产品开发奠定了理论基础。
The red Monascus pigment microcapsules were prepared by spray drying and shearing treatment with maltodextrin as a wall material. The comprehensive characteristics (differential angle, angle of repose, dispersion), particle size distribution, microstructure, absorbance and thermal stability of spray dried Monascus pigment powder before and after shearing was analyzed. The results showed that Monascus pigment powder exhibited a relatively uniform distribution after shearing, with particle size decreasing from 7.31 μm to 6.397 μm, and dispersion decreasing from 13.5 to 11, whose surface was smooth and full. Difference angle and angle of repose were also decreased, which could effectively reduce the dusting of the Monascus pigment powder. Meanwhile, the thermal enthalpy was slightly lower than that of Monascus pigment powder without shearing, thus improving the thermal stability. However, shearing did not significantly change the color value of the Monascus pigment powder. This study provides a basis for the preparation of Monascus pigment powder by spray drying and lays a theoretical foundation for the development of related products.
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