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Three methods of shade (MI), open sun (MII) and new designed of solar (MIII) drying were used for peppermint dehydration. The air velocity ( u ) and temperature ( T d) of MI, MII and MIII were 0.5, 0.5, and 1.5 m/s and 32, 36, and 48 °C, respectively. The energy utilization efficiency,  T d/ u  ratio and drying rate of MIII reached 85%, 48 °C.s.m −1  and 12.5 g H2O /min, respectively, which were higher than those in MI and MII. The inhibition power of dried peppermints against 6-log colony forming unit/ml of  Staphylococcus aureus  ( Sa ) were also evaluated. While the chlorophyll and essential oil extraction efficiency of MIII-product were 30% and 60% respectively higher than those in MII-product, its total phenolic contents and antioxidants activities were 25% and 26% more than those in MI-product. The essential oil of MIII-product had significantly ( p  &lt; 0.05) higher inhibiting compounds (mainly Menthone) against pathogenic gram-positive  Sa  compared with those in MI and MII-products.

drying technology

Effects of solar drying operation equipped with a finned and double-pass heat collector on energy utilization, essential oil extraction and bio-active compounds of peppermint ( Mentha Piperita  L.)