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Author: search.filters.author.Soponronnarit, SomchartSubject: search.filters.subject.Drying

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    Drying and mathematical modelling for the decelerated rancidity of treated jasmine brown rice using different drying media
    (2021-01-01)
    Junka, Nittaya
    ;
    Rattanamechaiskul, Chaiwat
    ;
    Wongs-Aree, Chalermchai
    ;
    Soponronnarit, Somchart
    Jasmine brown rice (JBR) attains a rancid odour because of lipid deterioration, which reduces its shelf life. This study focused on preserving JBR's stability through drying in a fluidised bed at 100–150 °C using different drying media: hot air (HA), humidified hot air (HHA), and superheated steam (SHS). The JBR and the rancid odour caused by thiobarbituric acid (TBA) were analysed. A mathematical model was developed for the drying process, and associated equations were formulated to predict the mechanism underlying changes in TBA during 180 days of storage. The dried samples became harder owing to gelatinisation of starch and decrease in 2-acetyl-1-pyrroline volatility. Changes in JBR quality were correlated to the drying temperature and drying media used. SHS drying at 150 °C decelerated TBA formation the most. The proposed mathematical model and associated equations can predict changes in TBA during storage accurately and be applied to JBR under most drying conditions.
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    Drying guideline to control colour quality of para rubber sheet by computation method
    (2018-12-01)
    Junka, Nittaya
    ;
    Rattanamechaiskul, Chaiwat
    ;
    Prachayawarakorn, Somkiat
    ;
    Soponronnarit, Somchart
    Colour is one of the most important basic physical characteristics of dried para rubber sheets. This characteristic is used to determine the standards and trading prices. In this research, a mathematical model and a colour change equation were developed for para rubber sheet drying in a hot air oven, with the yellowness index (YI) as an indicator. The results show that the mathematical model provides validation of the moisture change and that the first-order rate reaction equation gives a satisfactory prediction of the colour change. The determination coefficient for every drying condition is between 0.9080–0.9742 and 0.9273–0.9813. Suitable drying conditions were used in the simulation using the model and equation, and the shortest drying time was applied in the study. Moreover, the colour value of the simulated para rubber sheet is not higher than that of the reference Unsmoked Sheet (USS) whose moisture is decreased by sun drying and is still in the best standard range.