Preparation, characterization and biological activity study of purple sweet potato crude extract microcapsules

  • HE Xi ,
  • ZHAO Tao ,
  • LEI Ji ,
  • HUANG Ailan
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  • 1(College of Food Science and Biological Engineering, Xihua University, Chengdu 610039, China)
    2(Chongqing Key Laboratory of Speciality Food Co-Built by Sichuan and Chongqing, Chengdu 610039, China)
    3(Food Microbiology Key Laboratory of Sichuan Province, Chengdu 610039, China)

Received date: 2025-01-02

  Revised date: 2025-03-20

  Online published: 2025-11-21

Abstract

Purple sweet potatoes (PSP) are rich in active components such as anthocyanins and chlorogenic acid.However, these components are unstable in nature, and currently, the research on them is relatively limited.In this paper, PSP crude extract microcapsules (PPEM) were prepared using the vacuum freeze-drying method, and the characterization before and after encapsulation was compared through technologies such as Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD), as well as in vitro antioxidant and in vitro hypoglycemic effects.The total embedding rate of the prepared PPEM active ingredients reached 95.68%.The scanning electron microscope (SEM) showed that the surface of PPEM was smoother than that before embedding, and there was no cavity and fragmentation.FTIR spectroscopy and XRD spectroscopy confirmed that the active ingredients of the crude extract of PSP were successfully embedded.Storage stability experiments showed that PPEM had higher stability.Additionally, PPEM exhibited better in vitro antioxidant and hypoglycemic capabilities, with significantly higher free radical scavenging abilities against DPPH and ABTS cation radicals, as well as inhibitory effects on α-amylase and α-glucosidase compared to the crude extract (P<0.05).Multi-spectral experiments demonstrated that PPEM could alter the conformation of the above two enzymes, producing a stronger in vitro hypoglycemic effect.Correlation analysis showed that the in vitro antioxidant activity and hypoglycemic activity of PPEM were significantly positively correlated with anthocyanins and chlorogenic acid (P<0.01).In summary, the co-encapsulation of PSP active substances increased the active components’ stability and enhanced their in vitro antioxidant and hypoglycemic capabilities.This study can provide a reference for further research and development of PPEM.

Cite this article

HE Xi , ZHAO Tao , LEI Ji , HUANG Ailan . Preparation, characterization and biological activity study of purple sweet potato crude extract microcapsules[J]. Food and Fermentation Industries, 2025 , 51(21) : 286 -297 . DOI: 10.13995/j.cnki.11-1802/ts.042025

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