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Microwave pulsed vacuum drying (MPVD) revolutionizes wolfberry processing: synergistic effects on drying efficiency,
Yaqi Wei1, Lili Sun1, Jianxiong Hao1
1College of Food Science & Biology, Hebei University of Science & Technology, Shijiazhuang 050018, China.
None:
Dried wolfberry (Lycium barbarum L.) is valued for its nutrients, but conventional hot air drying (HAD) causes degradation and browning. This study compared microwave pulsed vacuum drying (MPVD) (4-6 W/g) with hot air drying (HAD). Microwave pulsed vacuum drying reduced drying time by 88.61%-92.5% and improved color, microstructure, and rehydration capacity. The 5 W treatment achieved the highest total sugar content (7.69 mg/g) and rehydration ratio (1.50). The 6 W treatment increased total phenolics by 119.50% and enhanced 2,2-diphenyl-1-picrylhydrazyl and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) scavenging rates by 31.57% and 6.26%, respectively. Microwave pulsed vacuum drying also preserved bioactive components by regulating pectin composition (57.51%-76.86% water-soluble pectin) and modulating metabolic pathways such as α-linolenic acid metabolism. This technology is a promising industrial technology for high-quality wolfberry processing.
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