Natural convection drying kinetics of ‘Prata’ and ‘D’água’ banana cultivars (Musa ssp) by nonlinear regression models

Abstract Banana is among fruits most planted in tropical countries and belongs to the fruit group most consumed in the world; however, banana needs proper conservation techniques. The aim of this study was to describe the drying kinetics of ‘Prata’ and ‘D’água’ banana cultivars at temperatures of 40 and 70°C, comparing the Henderson, STPE, Lewis, Page and Fick regression models, estimating the Absolute Drying Rate (ADR). Parameters were estimated with R and SAS Studio softwares, using for comparison and selection models of the R²aj, RSD and corrected Akaike Information Criteria. The Page and Fick models did not adjust, and the others presented good adjustment to data. The Henderson model was the most suitable to describe data of ‘Prata’ banana at both temperatures and ‘D’água’ banana at 70°C and Lewis at 40°C for this cultivar. The drying rate of ‘Prata’ banana at temperatures of 40 and 70°C were 0.00079 g of water/ min and 0.00400 g of water/min respectively and for ‘D’água’ banana, drying rates were 0.00111 g of water/min. and 0.00495 g of water/min., respectively. Using ADR, it was observed that in one third of the drying period, there was 70% of moisture loss at 70°C.

摘要：香蕉是热带国家种植规模最大的水果品类之一，同时也是全球消费量最高的水果之一，但香蕉需采用恰当的保鲜技术。本研究旨在探究'Prata'与'D’água'两个香蕉品种在40℃、70℃条件下的干燥动力学特性，对比Henderson、STPE、Lewis、Page及Fick五种回归模型，并估算绝对干燥速率（Absolute Drying Rate, ADR）。本研究采用R与SAS Studio软件进行参数估算，并以调整决定系数（R²aj）、相对标准偏差（RSD）及修正赤池信息准则作为模型对比与筛选的依据。结果显示，Page与Fick模型拟合效果欠佳，其余四种模型均可较好适配实验数据。其中，Henderson模型最适配'Prata'香蕉在两个温度下的干燥数据，同时适配'D’água'香蕉在70℃下的干燥数据；而Lewis模型则适配'D’água'香蕉在40℃下的干燥数据。'Prata'香蕉在40℃与70℃下的干燥速率分别为0.00079 g水/分钟、0.00400 g水/分钟；'D’água'香蕉的干燥速率则分别为0.00111 g水/分钟与0.00495 g水/分钟。通过绝对干燥速率分析可知，在70℃干燥条件下，仅需干燥总时长的三分之一即可完成70%的水分流失。