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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.)
Drying Technology ( IF 2.7 ) Pub Date : 2020-11-30 , DOI: 10.1080/07373937.2020.1836650
Mohsen Mokhtarian 1 , Ahmad Kalbasi-Ashtari 2 , Hong-Wei Xiao 3
Affiliation  

Abstract

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 (Td) 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, Td/u ratio and drying rate of MIII reached 85%, 48 °C.s.m−1 and 12.5 gH2O/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 < 0.05) higher inhibiting compounds (mainly Menthone) against pathogenic gram-positive Sa compared with those in MI and MII-products.



中文翻译:

配备翅片和双通道集热器的太阳能干燥操作对薄荷 (Mentha Piperita L.) 能量利用、精油提取和生物活性化合物的影响

摘要

薄荷脱水采用了遮荫(MI)、日晒(MII)和新设计的太阳能(MIII)干燥三种方法。MI、MII 和 MIII的空气速度 ( u ) 和温度 ( Td ) 分别为 0.5、0.5 和 1.5 m /s 以及 32、36 和 48 °C。MIII的能源利用效率、T d / u比和干燥速率分别达到85%、48°Csm -1和12.5 g H2O /min,均高于MI和MII。薄荷干对金黄色葡萄球菌6-log菌落形成单位/ml的抑制能力(Sa) 也进行了评估。MIII产品的叶绿素和精油提取率分别比MII产品高30%和60%,总酚含量和抗氧化活性比MI产品高25%和26%。与 MI 和 MII 产品相比,MIII 产品的精油 对致病性革兰氏阳性Sa的抑制化合物(主要是薄荷酮)显着( p < 0.05)更高。

更新日期:2020-11-30
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