PSRU Journal of Science and Technology

บทบรรณาธิการ

2025-04-17T11:47:47+07:00

ข-บทบรรณาธิการ

สารบัญ

2025-04-17T11:48:36+07:00

ค-สารบัญ

STUDY ON THE QUALITY OF RICE CRACKER (KHAO TAN) WITH GREEN CURRY FLAVOR

2024-06-12T11:50:46+07:00

This research aims to study the quality of the Khao Tan product cooked with coconut milk containing green curry paste at 15, 30, and 45% by weight of coconut milk (w/v) and to study the sugar content in green curry syrup for topping on the surface of Khao Tan products. The results showed that the color values of Khao Tan cooked with coconut milk containing green curry paste at three levels differed significantly (P≤0.05). The L* value of Khao Tan decreased, while the a* and b* values tended to increase with increasing concentration of green curry paste in coconut milk. All three formulas of Khao Tan had moisture content in the range of 2.91-3.66% and water activity (a_w) values in the range of 0.29-0.36, which were lower than the value specified in the community product standard for Khao Tan (a_w<0.60). Hardness and fracturability were highest for Khao Tan cooked with coconut milk containing 30%w/w green curry paste (P≤0.05). For the swelling rate, the three formulas of Khao Tan were not significantly different (P>0.05). The sugar content in green curry syrup was varied at 15, 20, and 25% by weight ingredient (w/v). The color values of both L*, a*, and b* were highest in syrup containing 25%w/v sugar (P≤0.05), while the total soluble solid contents were not significantly different (P>0.05). For the sensory evaluation, the results showed that the Khao Tan topped with syrup containing 15%w/v sugar was the most suitable formula, which received higher scores than the other formulas in terms of color, odor, taste, and overall liking. The Khao Tan cooked with coconut milk containing 30%w/w green curry paste and topped with syrup containing 15% sugar (100 grams) contained moisture 5.99%, protein 4.67%, fat 16.13%, ash 0.93%, fiber 1.44%, and carbohydrate 70.85%. The results of this study can be a guideline for developing the Khao Tan product with varieties of local materials and herbs to increase choices for consumers and further commercialization.

ANTIMICROBIAL RESISTANCE STUDY OF SALMONELLA ISOLATED FROM CHICKEN MEAT IN FRESH MARKETS AND RETAIL SHOPS MUEANG DISTRICT, LOEI PROVINCE

2024-06-21T09:29:56+07:00

Contamination of Salmonella in chicken meat is a leading cause of gastrointestinal diseases. Furthermore, there are data indicating that Salmonella is resistant to antibiotics, causing health problems. The aims of this research were studied the antimicrobial resistance of Salmonella isolated from chicken meat in Muang District, Loei Province. A total of 36 chicken meat samples were collected and cultured in the laboratory of standard methods (ISO6579: 2002) and tested for susceptibility to 5 antimicrobial agents: Amoxicillin, Ciprofloxacin, Nalidixic acid, Norfloxacin, and Gentamicin, using the disk diffusion test method. The results showed that out of 36 chicken samples, Salmonella were found in 25 samples (69.44%), 12 isolates of Salmonella were resistant to Amoxicillin, 7 isolate was resistant to Ciprofloxacin, 5 isolate was resistant to Nalidixic acid, 1 isolate was resistant to Norfloxacin and 6 isolate was resistant to Gentamicin. Resistance to 2, 3 and 4 antimicrobial agents was observed in 6, 3 and 1 isolates, respectively. Antibiotic resistance arises from excessive and improper use of antimicrobial agents, contributing to the contamination of Salmonella and residues of antimicrobials in chicken meat. Addressing these issues is crucial to ensure the benefits and safety of chicken meat consumption for public health.

EFFECT OF COW MANURE AND PHOSPHATE FERTILIZER ON GROWTH AND PHYSIOLOGICAL CHARACTERISTIC OF AZOLLA (AZOLLA MICROPHYLLA)

2024-07-12T08:41:11+07:00

The objective of this research was to study the effects of cow manure and phosphate fertilizer on growth, morphological and physiological characteristics in terms of total chlorophyll content, protein content and the amount of Cyanobacteria (Anabaena azollae) living in Azolla microphylla by growing Azolla in tap water (Control; T1) compared with 4 fertilizer formulas: cow manure fertilizer 500 grams (T2), cow manure mixed with soil at a ratio of 500 grams per 2 kilograms (T3), rock phosphate (P₂O₅) 30 grams (T4), and monopotassium phosphate fertilizer (KH₂PO₄) 30 grams (T5). Experimental data were collected at 30 days. From the results, it was found that Azolla fed with rock phosphate had the highest shoot dry weight and root number but Azolla cultivated with cow manure alone had the highest relative growth rate, total chlorophyll content and the amount of Cyanobacteria. But it could be seen that Azolla fed with cow manure and monopotassium phosphate had the highest protein content. The information in this study can be use as basic information in Azolla cultivation and further apply in agriculture.

INDUCTION OF CYTO-GENOTOXICITY IN ONION ROOT CELLS (ALLIUM CEPA) OF KRATOM DRINKS

2024-07-16T14:56:15+07:00

Kratom (Mitragyna speciosa Korth., Havil.) is found in natural forests in southern Thailand and classified as a psychoactive plant. Traditional consumption of kratom is fresh leaves use. But nowadays, young southern people consume kratom by boiling and mixing it with other ingredients. This may affect to the health in a long term. Therefore, to evaluate the effects of consuming kratom drinks, the objective of this research was to study the induction of cytotoxicity and genetic material in onion root cells soaked in three formulas of kratom water drinks (Kratom water, Kratom water mixed with cough syrup and Kratom water mixed with cough syrup and soft drinks) for 72 hours. The study found that all formulas of kratom water drink slowed down the growth of onion root tips and change their physical appearance. The toxicity study on cell division and chromosome abnormalities found that kratom water mixed with cough syrup and soft drinks resulted in lowest decrease in the mitotic index of 19.37±2.46, the frequency of chromosomal abnormalities increased by 3.47±3.38 percent, and the total protein content significantly decreased to 528.83±169.10 micrograms per milliliter compared to the control. Many forms of chromosomal abnormalities were observed under a microscope. Therefore, in order to get the most benefit from this research, it should be accelerated to create awareness of the negative effects that occur to consumers.

THE INVENTION OF A SIMPLE ACID-BASE TEST KIT USING REAGENT EXTRACTED FROM LEAVES LOVE PLANT

2024-06-19T08:29:55+07:00

This research aimed to study the reagent extracted from the leaves of the love plant (Oxalis triangularis A. St. Hil.) and to apply this reagent as an acid-base detection test kit. The test kit was fabricated by modifying the reagent on filter paper (No. 1) for ease of observation. The filter paper was cut into sizes 1 centimeter wide and 5 centimeters long, weighed for 2 grams, and then soaked in 100 milliliters of reagent for 24 hours. Then, the modified filter papers were dried in a desiccator for 24 hours and called FP-love plants. Then, the FP-love plant was used for determination of pH of buffer solution (pH 1–14). The results showed that the different colors of the FP-love plant were clearly depended on pH value of the solutions after 5 minutes of reaction time. Then, the FP-love plant was applied to determine pH of commercial products. It was found that the color change of FP-love plant was correlated with the results from pH-meters and pH indicator strips. Moreover, this research could present the usefulness of using local plant extract as an acid-base indicator kit with simple operation, cost-effectiveness, and environmental safety.

CALCULATION OF VELOCITY OF CHARGED PARTICLE ACTIVATED BY TIME-DEPENDENT EXTERNAL FORCE FOR MOTION IN UNIFORM MAGNETIC FIELD

2024-06-21T08:46:33+07:00

This research aimed to show the method of the time-dependent velocity of electrically charged particle +q in y axes and z axes. In which electrically charged particle +q are stimulated by external forces to move within an area with a magnetic field. Electrically charged particles are stimulated by external forces to move in the presence of a magnetic field. The magnetic field is always constant. The research results show that the time-dependent velocity of electrically charged particle +q in y axes and z axes moving in a magnetic field which has an oscillating motion similar to a wave group. The magnitude of charge particle and magnetic initial value varies inversely with the time-dependent velocity of electrically charged particle +q in y axes and z axes. In this research, we can use the electric charge particle velocity equation in y axes and z axes to create instructional media related to the topic of electromagnetic in physics course.

STUDY OF COMPOST QUALITY USING ITS PHYSICOCHEMICAL CHARACTERISTICS AND PHYTOTOXICITY ON BRASSICA RAPA SUBSP. PEKINENSIS

2024-08-02T16:46:44+07:00

This research studied the compost quality using its physicochemical characteristics and phytotoxicity on Brassica rapa subsp. Pekinensis. Compost derived from porcine manure and bovine manure mixed with fine bran, fish fermentation, and bat manure in the percentage ratio of 53.85, 37.50, 4.56, 3.15, and 0.94, respectively, was prepared and kept under the shed in 10 air-flow bags. During composting, a short period of high temperature was observed within 14 days. Nevertheless, changing of compost quality was observed throughout the entire study. Organic matters (OM) decreased with time as same as the C/N ratio (r =-0.506 & -0.795, respectively P<0.01) responding to the increasing of electrical conductivity (EC) (r = 0.821, P<0.01) through mineralization process. A high humic acid (HA) content at the beginning stage coming from the initial materials corresponded with the stability of humic structure as shown by the high optical density (E₂₈₀/E₄₆₅). The decreasing of E₂₈₀/E₄₆₅ during the composting indicated the humification process responding to the more aliphatic structures at 465 nm while unsaturated structures of raw materials at 280 nm decreasing.The germination index (GI)also indicated that during 21-49 days, the compost was appropriate to use without phytotoxicity but if mixing the compost too long till 63 days, the EC would be too high exceeding the Department of Agriculture’s Thai standard of fertilizer and lower GI from too much salt.Therefore, study the compost’s physicochemical characteristics together with its phytotoxicity would help determining compost quality which would be beneficial for compost management and selecting the appropriate duration to effectively use.

COMPARISON OF FIRING TEMPERATURE ON PHYSICAL AND MECHANICAL PROPERTIES OF CONSTRUCTION COMMON BRICKS

2024-07-16T14:20:00+07:00

This research aims to study and analyze the characteristics and properties of raw materials used in the production process of common clay bricks from the Small and Micro Enterprise Community clay brick-making groups in San Bun Reung village, Lampang Province. The raw materials used in the study were sourced locally, specifically from the SiKam clay source (RCB-1) and the BunRai clay source (RCB-2). The characteristics and properties of the raw materials were analyzed using laser diffraction particle size measurement, chemical composition by X-ray fluorescence (XRF), and mineral composition by X-ray diffraction (XRD). The samples were then fired at temperatures of 800, 900, and 1000°C. The tested properties of the common clay bricks included shrinkage after firing, water absorption, and compressive strength. The experimental results indicated that the properties of the bricks made from the BunRai clay source fired at 900°C (RCB-2) had a shrinkage rate of 13.30%, a water absorption rate of 13.40%, and conformed to the industrial product standards (TIS 77-2545), which state that it should not exceed 25%. The compressive strength was measured at 34.50 MPa. The Small and Micro Enterprise Community clay brick-making groups in San Bun Reung village can utilize the RCB-2 clay in the production process and firing at 900 degrees Celsius, resulting in bricks that meet the standards of industrial products (TIS 77-2545).