![]() Sonication modified the microstructure of basil, which was manifested in larger and elongated cellular spaces. Application of US significantly reduced the drying time up to 20% and decreased the total specific energy consumption maximally by 26.2% in the case of 35 kHz 20 min US-treated basil. ![]() The US pretreatment was applied at different frequencies (21, 35 kHz) for variable time (20, 30 min). The aim of this study was to investigate the influence of US prior to microwave–convective drying on the drying kinetics, water diffusivity, total phenolic content, antioxidant activity and microstructure of basil leaves. The current study is one of the first provided data on both the quality changes and the drying kinetics of herbal material affected by ultrasound (US).
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