Drying characteristics and quality evaluation in convective drying of Cissus quadrangularis Linn.

Setthawat Thanimkarn,Ekkapong Cheevitsopon,Jiraporn Sripinyowanich Jongyingcharoen,C Hamontree

doi:10.1051/matecconf/201819203041

Setthawat Thanimkarn, Ekkapong Cheevitsopon + Show 2 more

Open Access

https://doi.org/10.1051/matecconf/201819203041

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Abstract

This study aimed to investigate the effect of drying temperature (40, 60, 80, and 100°C) on drying characteristics of Cissus quadrangularis Linn. (CQ) undergoing convective drying. Physical properties and phytochemicals of the dried CQ were also evaluated. CQ with the thickness of 5 mm was dried from about 10 to 0.1 g water/g dry matter. The results showed that increasing drying temperature increased drying rate (DR) and effective moisture diffusivity (Deff) and consequently decreased drying time. The drying time, maximum DR, and Deff were in the ranges of 85-1920 min, 0.0059-0.0248 g water/g dry matter·min, and 0.7302-9.1281×10-9 m2/s, respectively. Lower drying temperature could preserve quality of the dried CQ. Decreasing drying temperature resulted in greener and lower bulk density and shrinkage. The greatest total phenolic content (TPC) and quercetin content were obtained by drying the CQ at 60°C.

Highlights

Cissus quadrangularis Linn. (CQ), a conventional medicinal plant, is used for treatment of various conditions such as hemorrhoid and irregular menstruation [1]
It can be observed that the Moisture ratio (MR) decreased with drying time following an exponential decay
This observation is in agreement with previous results on thin-layer drying of biological products [7]

Summary

Introduction

CQ, a conventional medicinal plant, is used for treatment of various conditions such as hemorrhoid and irregular menstruation [1]. Fresh CQ cannot be consumed as it contains calcium oxalate which leads to throat irritation. As same as most herbal plants, it must be dried, ground and capsulated for consumption [2]. Convective drying has been the most common way to produce the dried CQ. Drying temperature is a crucial parameter required for dryer operation. This parameter can affect the moisture transport phenomena and stability of phytochemicals in material.

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