Rattanamechaiskul, Chaiwat

Preferred name

Alternative Name

Rattanamechaiskul, C.

Main Affiliation

KMITL Prince of Chumphon Campus

chaiwat.ra@kmitl.ac.th

Now showing 1 - 10 of 17

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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
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Rattanamechaiskul, Chaiwat
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Wongs-Aree, Chalermchai
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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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Mathematical modelling to control fungal growth in paddy dried using fluidisation
(2021-04-01)
Junka, Nittaya
;
Rattanamechaiskul, Chaiwat
Fungi can infect paddy from the planting process through to storage. Contaminating fungi can produce aflatoxins that can persist in the paddy and in storage until it is used to make other products. In the interests of food safety, in this study, we aimed to control the growth of fungi in paddy during storage using mathematical modelling of a drying method that uses fluidisation at temperatures of 70–150 °C. We found experimentally that an increase in the drying rate was related to an increase in the drying temperature. Drying paddy at a high temperature hardened the texture of rice when cooked, owing to the starch gelatinisation. Drying could decrease fungal growth (FG) and aflatoxin content during storage; however, it also resulted in a decrease in the antioxidant properties of paddy. Mathematical modelling and a proposed FG equation were applied to predict a suitable drying condition. The optimal drying condition reduced the risk of FG in stored paddy by ~50% without affecting antioxidant properties.
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Effects of hot air and microwave drying on kinetic rate and mechanical property of oil palm veneer
(2017-01-01)
Lekachaiworakul, Puttipong
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Dangvilailux, Panya
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Rattanamechaiskul, Chaiwat
This research was studied, the hot air and microwave drying of Oil Palm Veneer (OPV). The oil palm trees at 27 years of age were collected from a plantation in Chumphon. They were processed into a dimension of 80 x 150, 1 mm (thickness) and initial moisture 345 % (db.). The chamber of oven is size of 500 x 1,000 x 1,000 mm<sup>3</sup>. It had an electrical heater at maximum power output of 5,000 watts, air speed of 2.1 m/s and the microwave power level of 1,000-4,000 watts. The final moisture content reached 10±2% (db). The results were showed that while OPV drying with the hot air condition used temperature about 50, 70 and 90 °C reached the target value within 70, 32 and 16 min respectively, the microwave condition used to power about 2,000 and 3,000 watts reached the target value within 62 and 34 min, combined condition used hot air 50°C with microwave power level 2,000 and 3,000 watts, hot air 70 °C with microwave power level at 2,000 and 3,000 watts and hot air 90 °C with microwave power level 2,000 and 3,000 watts reached the target value within 24, 20, 14, 10, 10 and 8 min respectively. Moreover, drying with hot air and microwave on high power revealed the tensile stress and shear properties increased. However, the hot air at 70, 90 °C combines with the microwave power level 2,000 watts were better than mechanical properties of hot air at 70, 90 °C combines with microwave power level 3,000 watts. The results showed the drying of hot air at 90 °C combine with the microwave power level at 2,000 watts, mechanical properties of OPV dried tensile stress at 1.9447 MPa, shear stress 19.0286 MPa, which used of energy 39 kWh, its surface was cracked burns. Therefore, the drying hot air only conditions at 90 °C can be recommended for mechanical properties, tensile stress 1.8229 MPa, shear stress 18.4472 MPa, used of energy 21 kWh, which was OPV suitable and cost optimality.
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Comparative study of organic solvents and extraction conditions on colour and antioxidant capacity in red cabbage
(2017-01-01)
Junka, N.
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Rattanamechaiskul, C.
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Wongs-Aree, C.
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Kanlayanarat, S.
In industrially natural-dye production, there are many organic solvent with different efficiencies for extracting colour and antioxidants of red cabbage. The objective of this study was to investigate appropriate organic solvent and extract condition on colour and antioxidant activity. Two organic solvents were used for extraction: ethanol for hydrophilic antioxidants and hexane for lipophilic antioxidants. Experimental results showed that red cabbage extracted by ethanol was significantly higher in purple colour, anthocyanin content, total phenolic content, antioxidant activity by 2,2-diphenyl-1-picrylhydrazyl radical assay (DPPH), and ferric reducing/antioxidant power assay (FRAP) than extraction by hexane due to anthocyanins being the main phenolic compound in extract. To find the appropriate concentration and extraction time, the results revealed that the red cabbage extracted by 70% ethanol for 18 h was suitable for extracting bioactive polar compounds, such as hydrophilic antioxidants.
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Performance comparison between gradient orifice and uniform orifice distributors in rotating fluidization for coated jasmine rice
(2026-04-01)
Prakotmak, Preeda
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Phothong, Watchama
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Rattanamechaiskul, Chaiwat
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Junka, Nittaya
A rotating fluidized bed coater offers an alternative technology in which particles are fluidized by balancing centrifugal, buoyant, and gravitational forces, thereby improving coating homogeneity and mass transfer. The coating performance between the gradient orifice distributor (GOD) and the uniform orifice distributor (UOD) was compared at rotational speeds of 20, 70, or 120 rpm. The experiment was set up to coat a turmeric-extract solution onto the surface of jasmine rice. The coating substance was sprayed from the nozzle at 35 or 40 mL/min at an air-atomization pressure of 1.5 bar for 6 or 8 min. Hot air (55 or 60 °C) flows were passed at an inlet velocity of 2.9 m/s, with 85 % by volume of the air recycled. The quality of the sample was evaluated based on its final moisture content, percentage of fissure kernels, head-coated rice yield, color, coating efficiency, total phenolic content, and antioxidant activity. Based on the results, GOD was a suitable distributor plate for producing turmeric-extract-coated rice. For optimal coating conditions, the jasmine rice should be coated at a drying temperature of 55 °C, using a coating solution spray rate of 35 mL/min, a rotational speed of 70 rpm, a spraying coating time of 6 min, and a drying time of 10 s after the spraying stage. Using these conditions, the coating efficiency was 84.2 % and the antioxidant activity of the coated rice was 30.53 % higher than that of the referent white rice.
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Free Fatty Acid Deformation of Treated Black Glutinous Rice During Storage by Fluidization Drying
(2017-06-01)
Junka, Nittaya
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Rattanamechaiskul, Chaiwat
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Wongs-Aree, Chalermchai
This research was contemplated for two purposes: to study a consequent change in the free fatty acid (FFA) content of dried black glutinous rice by fluidization drying and to develop a mathematical equation for predicting FFA formation during storage. It was found that during the same storage period, the rice that passed through the drying process at temperatures of 100, 130 and 150°C accounted for less formation of FFA content than the referenced rice, and the FFA formation was reduced in accordance with the increasing drying temperature. In regard to the proposed equation, predicted FFA formation in rice during the storage period by zero-order rate reactions yielded the best fit with the values acquired from the experiment. Practical Applications: The drying process, which uses fluidization with high temperature hot air, is a highly efficient drying method in reducing moisture of the paddy to a suitable level before transporting or storing. In addition, such a method could be applied to the inactivated lipase enzyme to prevent hydrolysis of lipids in rice bran that give rise to FFA, which results in undesirable rancidity for consumers. Data on the change in the FFA content acquired from the experiment would be used to develop a mathematical equation for predicting FFA formation in black glutinous rice during the storage period. The suitable drying condition and proposed mathematical equation would be beneficial as a drying guideline to control rancidity of rice during storage.
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Enhancing biodiesel yield and purification with a recently developed centrifuge machine: A response surface methodology approach
(2024-04-15)
Limmun, Warunee
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Chungcharoen, Thatchapol
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Rattanamechaiskul, Chaiwat
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Phetpan, Kittisak
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Limmun, Wanida
Biodiesel production processes, such as gravity settling, have limitations in terms of biodiesel yield, purification efficiency, operating time in the separation process, and more extensive equipment. Therefore, this study has focused on using a recently developed centrifuge machine for biodiesel separation to address these challenges due to its compact design, high efficiency, and simplicity. Additionally, this study aimed to optimize the separation efficiency of glycerol from biodiesel using a centrifuge machine, employing response surface methodology (RSM) with central composite design (CCD). The optimum conditions for separating glycerol from biodiesel via centrifuge machine are a rotation speed of 1800 rpm, a mixture flow rate of 192.25 ml/min, and a temperature of 55 °C, respectively. In optimum conditions, 94.52% separation efficiency was achieved. Biodiesel production can be improved, leading to higher yields and greater purity. The utilization of RSM proved valuable in determining the optimum conditions for separation. Furthermore, the machine successfully separated the biodiesel to meet ASTM D6751 and EN 14,214 standards. The results highlight the potential of the centrifuge machine for efficient and reliable biodiesel production, contributing to the advancement of the biodiesel industry.
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Increasing energy efficiency of the Cissus quadrangularis drying by hot air fluidization technique
(2017-01-01)
Promnuch, Jutamas
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Junka, Nittaya
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Wongs-Aree, Chalermchai
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Soponronnarit, Somchart
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Srisang, Naruebodee
The aim of this paper is to increase energy efficiency by reducing specific energy consumption (SEC) during Cissus quadrangularis drying. The fresh sample, with a high moisture content of 90 ± 2 % wet basis (w.b.), was dried by hot air Fluidized bed technique at temperatures of 90, 110, 130 and 150°C to a final moisture content of 5 % (w.b.) and then was compared to the results of tray drying at a low temperature of 50°C, following a method by Tha Sae Hospital in Chumphon province, Thailand. The drying kinetic result revealed that fluidization drying had a higher rate of water removal than the tray drying method. That rate directly correlated with the drying temperature; it increased with an increase of drying temperature. With the increasing of the rate, it resulted in a decreasing of SEC. Although using a drying temperature of 150°C had the highest rate of water removal and subsequently had the lowest SEC, it negatively affected the antioxidant activity of the sample. To dry Cissus quadrangularis with the lowest SEC as possible, it should be dried by hot air fluidization at a drying temperature of 110°C. At this drying condition, there is still a high rate of water removal and a low effect of the desired qualities of the sample.
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Influence of hot air fluidized bed drying on quality changes of purple rice
(2016-09-09)
Rattanamechaiskul, Chaiwat
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Junka, Nittaya
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Wongs-Aree, Chalermchai
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Prachayawarakorn, Somkiat
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Soponronnarit, Somchart
The influence of drying using a fluidization technique on the quality of purple rice was investigated in this study. The results demonstrated that the initial moisture of rice was 28.3% dry basis (db). Compared to the sun-dried or reference purple rice samples, the influence of drying at temperatures ranging from 100 to 150°C did not affect the quality of color, anthocyanin content, total phenolic content, or antioxidant activity. At this initial moisture level, samples should be dried at 150°C air because such temperatures yield the highest drying rate. Drying at this temperature also causes an increase in the head purple rice yield because of the gelatinization of starch. In the case of an initial moisture content of 33.3% (db), the drying temperature should not exceed 130°C.
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Drying guideline to control colour quality of para rubber sheet by computation method
(2018-12-01)
Junka, Nittaya
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Rattanamechaiskul, Chaiwat
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Prachayawarakorn, Somkiat
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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.
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Rattanamechaiskul, Chaiwat

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