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Browsing SCA-Article by Author "Jeerun Kingkaew"

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    Study of pH Changes of Rice and Suitable Condition of Mixed Indicator Solution for Developing a Simple Rice Age Test Kit
    (The Journal of KMUTNB, 2023) Kittisak Wasantiwong; Rungtiwa Wongsagonsup; Dusit Angthararuk; Jeerun Kingkaew
    Rice grains encounter the changes of physicochemical properties along the storage periods, thus affecting the cooking and eating properties. This research aims to study the pH changes of stored rice cultivars during different storage times and to find the suitable condition of mixed indicator solution between Methyl red and Bromothymol blue for developing a simple test kit for age estimation of stored rice. The rice cultivars used were RD 6, Khao Dawk Mali 105, and Phitsanulok 2, which were stored for 0–12 months at room temperature. The results showed that for rice with increasing storage time, pH value of rice decreased. The pH of RD 6, Khao Dawk Mali 105, and Phitsanulok 2 rice cultivars decreased from 6.82–6.45, from 7.09 to 6.45 and from 7.03–6.49, respectively. The color of the mixed indicator solution changed according to the pH value of phosphate buffer (pH 5.8–7.2). The suitable condition giving the most obvious color differences in pH 5.8-7.2 of mixed indicator solution between Methyl red and Bromothymol blue was at ratio of 60 : 40 and volume of 0.30 ml. When the stored rice samples of varying ages were tested with the optimum mixed indicator solution, the solution color changed from green to yellow and orange with the increasing storage times of rice. This can be used for developing a simple test kit for age estimation of stored rice and would also solve the problem of adulteration of fresh and aged rice.
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    The Effect of Watering rate to Napier Pak Chong 1 Grass on Its Yield and Quality Using a Soil Moisture Sensor Module
    (RMUTP Research Journal Sciences and Technology Vol. 18 No. 1 (2024): January - June 2024, 2024-01-30) Kittisak Wasantiwong; Jeerun Kingkaew; Weerawat Punquejana
    The research aims to study on watering rates per the Napier Pak Chon 1 grass yield and quality, including fresh-weight, dry-weight and crude protein content by using randomized complete block design in each field cutting Napier grass 3 times: 1st, 70-days aged, 2nd at 115-days aged, and 3rd at 150-days aged. The watering rates of water at 12, 16, and 20 cubic meters per rai. The results showed that in the 1st cutting was not different significantly (P > 0.05), the results as fresh-weight of 4,190+403, 4,019+435, and 3,995+320 kg per rai, dry-weight of 779+109 746+86, and 734+64 kgs per rai, crude protein of 10.88+1.02, 10.73+0.83 and 10.08+0.98 percent, and amount of watering 6 times per plot. The 2nd cutting was not different significantly (P > 0.05), the results as fresh-weight of 7,075+618, 6,924+511, and 6,837+511 kgs per rai, dry-weight 1,085+64, 1,037+123, and 1,036+37 kgs per rai, and crude protein of 12.91+1.54, 12.88+1.33, and 12.86+1.19 percent and amount of watering 3 times per plot. In the 3rd cutting, the results near by the 2nd cutting and was not different significantly (P > 0.05). The results as fresh-weight of 7,590+691 7,446+555 and 7,456+788 kgs per rai, dry-weight of 1,138+162, 1,161+166, and 1,112+108 kgs per rai, crude protein of 12.98+1.55, 12.95+1.58, and 12.94+1.08 percent, and amount of watering 5 times per plot. In conclusion, the optimum watering rate was 12 cubic meters per rai a time.