PHYSICAL PROPERTIES OF DIFFERENT SOYBEAN CULTIVARS DURING DRYING

Michele R Hauth,Gabriel H H De Oliveira,Fernando M Botelho,Sílvia De C C Botelho,Renata H Hoscher

doi:10.1590/1809-4430-eng.agric.v38n4p590-598/2018

Abstract

ABSTRACT The knowledge of physical properties of grains is important for the optimization of postharvest operations. Thus, this study aimed to evaluate the effect of moisture content over physical properties of different cultivars of soybean. Soybean of cultivars NS7901RR, TMG1180RR, P98Y70 and TMG132RR were used, with initial moisture content of 0.32, 0.27, 0.25 and 0.21 dry basis (d.b.), respectively. In order to dry the samples, an oven of forced air circulation was used. Samples were dried at temperature of 50 °C, being the drying procedure stopped when the moisture content of soybean was equal or inferior than 0.15 (d.b.). During drying, for interested moisture contents, physical properties were determined: bulk density, equivalent diameter, sphericity, circularity and surface/volume ratio. It was noticed that all physical properties analyzed presented a direct relationship with moisture content. With exception of the equivalent diameter, all the remaining physical properties increased linearly with moisture content reduction. Physical differences were observed among soybean cultivars during drying. However, variation of analyzed properties occurred in different proportions during drying for each cultivar.

Highlights

Soybean, Glycine max (L.) Merrill is an important commodity in the Brazilian agricultural scenario
Being that stated, drying is the most used method to assure final product quality, since it reduces the amount of water present in the material, decreasing its biological activity and chemical and physical changes that may occur during storage (Corrêa et al, 2007)
The objective of this study is to evaluate the effect of moisture content variation over the physical properties of different soybean cultivars

Summary

INTRODUCTION

Glycine max (L.) Merrill is an important commodity in the Brazilian agricultural scenario Valorization of this product is associated, among other factors, by its different use in the industry due to its chemical composition, in other words, is a product that possess elevated contents of oil and protein, around 20% and 40%, respectively. Being that stated, drying is the most used method to assure final product quality, since it reduces the amount of water present in the material, decreasing its biological activity and chemical and physical changes that may occur during storage (Corrêa et al, 2007). Other variables impact the physical properties, such as drying air temperature (Coradi et al, 2015; Oliveira et al, 2010), and seeding period (Bornhofen et al, 2015). The objective of this study is to evaluate the effect of moisture content variation over the physical properties of different soybean cultivars

MATERIAL AND METHODS

RESULTS AND DISCUSSION

CONCLUSIONS