Sriprom, Pongsert

Preferred name

Sriprom, Pongsert

Alternative Name

Sriprom, P.

Main Affiliation

School of Food Industry

pongsert.sr@kmitl.ac.th

Now showing 1 - 10 of 39

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Comparative physicochemical and rheological properties of tamarind seed xyloglucan from sweet and sour tamarind cultivars for food applications
(2026-06-01)
Julapuk, Punwadee
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Sriprom, Pongsert
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Narkrugsa, Woatthichai
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Phumjan, Lamphung
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Adair, Pornpatu
This study comparatively investigated the physicochemical, structural, and rheological properties of xyloglucan extracted from sweet (Sri Chomphu) and sour (Kradan) tamarind kernel (TKP) cultivated in Thailand to provide insights for industrial applications. The extraction yields were 58.35 ± 0.28% and 57.90 ± 0.37% (w/w) for sweet and sour TKP, respectively. Chemical composition analysis revealed comparable macronutrient profiles between the two samples. FTIR spectra confirmed similar functional groups, while SEM analysis showed amorphous and heterogeneous structures with slight differences in porosity. Molecular weight distribution indicated that sour TKP-derived xyloglucan was dominated by intermediate molecular weight fractions (4.03 × 10⁵ Da, 70.46%), whereas sweet TKP-derived xyloglucan exhibited a broader distribution. These structural differences influenced hydration properties, with sweet xyloglucan showing significantly higher water absorption and solubility (%WAI: 475.02 ± 9.91%; %WSI: 5.62 ± 0.62%) compared to sour xyloglucan (%WAI: 398.81 ± 7.01%; %WSI: 4.81 ± 0.57%). Evaluation of gelling properties revealed that both samples exhibited maximum gel strength at 2% concentration and pH 3, with sour xyloglucan forming stronger gels. Rheological analysis demonstrated non-Newtonian pseudoplastic behavior and dominant elastic characteristics (G′ ' G″), with higher viscosity observed in the sour cultivar. Emulsifying activity and stability were high and showed no significant differences (EA: 93.58–94.87%; ES: 97.94–98.71%). Overall, while cultivar origin had minimal impact on structural and emulsifying properties, it significantly influenced hydration and gelling-related characteristics, supporting the potential of tamarind xyloglucan as a versatile hydrocolloid for food and material applications.
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Monitoring of organochlorine pesticide residues in school milk and associated health risk assessment in Thailand
(2026-06-01)
Cha-aim, Chatartorn
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Manamoongmongkol, Kanjana
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Nisapai, Wiparat
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Phumjan, Lamphung
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Oomnog, Niroth
School milk products are recognized as an important and affordable food source for Thai people, particularly students. However, milk was classified as an agricultural product in which organochlorine pesticide (OCP) residues can be detected due to its fat content. This study investigated the levels of organochlorine pesticides in school milk products, including raw milk, pasteurized milk, and UHT milk, using the QuEChERS method. The fat content of these three types of milk was 3.50%, 3.03%, and 3.33%, respectively. A correlation coefficient (R2) of 0.9953–0.9998 confirmed the validity of the QuEChERS method. The limit of detection (LOD) for each pesticide ranged from 0.003 to 0.0615 mg/kg, and the limit of quantification (LOQ) ranged from 0.010 to 0.2050 mg/kg, with recovery rates of 80.95–110.00%. The analysis for 13 organochlorine pesticide residues, including Aldrin, Cis-Chlordane, Trans-Chlordane, Dieldrin, p,p'-DDD, p,p'-DDE, p,p'-DDT, Endrin, Heptachlor, Heptachlor epoxide, alpha-HCH, beta-HCH, and gamma-HCH using a GC–MS, revealed that no residues were detected above the LOQ (0.01 mg/kg) in any samples, indicating compliance with food safety standards. A scenario-based risk assessment using estimated daily intake (EDI) and hazard quotient (HQ) suggested that, although current exposure is negligible, potential risks may arise under worst-case conditions, particularly for aldrin, dieldrin, and heptachlor in high-consumption groups. Overall, school milk products in Thailand are considered safe; however, continuous monitoring and risk assessment remain essential to ensure long-term food safety.
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Germinated Brown Rice Preparation for Value Added Material for Healthy Brewed Vinegar
(2022-01-01)
Sriphochanart, Wiramsri
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Krusong, Warawut
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Surayot, Utoomporn
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Mekkerdchoo, Orachorn
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Sriprom, Pongsert
Soaking grains in water during the preparation of germinated brown rice (GBR) can result in the multiplication of bacterial contaminants. To address this problem, a system was designed to automatically change the soaking water every 6 h. A significant reduction of the contaminants was observed. GBR was saccharified by mold bran Amylomyces rouxii. The 5 day saccharified GBR that contained the highest α-amylase and glucoamylase activities was further used for alcohol fermentation by yeast Saccharomyces cerevisiae. Then, acetic acid was produced by Acetobacter aceti through a semi-continuous process. In the evaluation of the nutritional quality during processing, significant increments in the levels of γ-aminobutyric acid (GABA), antioxidant activities (DPPH), and total phenolic contents were found during soaking, but these levels progressively decreased in wine and were lowest in vinegar. Moreover, the soaking period from 36 h to 48 h had no significant effect on these substances. GC-MS analysis indicated that four important volatile organic compounds in the produced wine and vinegar were reported for their antimicrobial activity. Furthermore, no change in GABA was found in the vinegar over 6 months of storage. Thus, using this method could successfully produce brewed vinegar with health benefits from GBR.
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Preparation of Vegetable Waste-Derived Paper Incorporated with Activated Carbon for Delay Mango Ripening and its Application
(2026-01-01)
Sriprom, Pongsert
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Thongkham, Phaewa
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Taweesukyingjaroen, Jurairat
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Somphan, Apiruk
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Manamoongmongkol, Kanjana
In this study, the vegetable waste-derived paper was developed from vegetable waste-derived fiber and Mahachanok mango seed-derived activated carbon to extend the shelf life of Golden Nam Dok Mai mangoes. Vegetable waste was subjected to alkaline processing using sodium hydroxide to extract plant-based fibers, which were then formed into paper sheets. Activated carbon, derived from Mahachanok mango seeds by carbonization at 450°C and activated by potassium permanganate (KMnO4), was incorporated into the vegetable waste-derived paper to enhance ethylene adsorption efficiency. Three formulations of ripening delay paper were prepared: paper without activated carbon, paper containing 10 g of activated carbon, and paper containing 20 g of activated carbon. The physical properties of the papers were evaluated in terms of tensile strength and water drop absorption. The vegetable waste-derived paper incorporated with 20 g activated carbon showed the highest performance among the developed papers (1.20 ± 0.24 MPa and 0.74 seconds, respectively). Application tests on Golden Nam Dok Mai mangoes showed that the 10 g activated carbon formulation was the most effective in preserving flesh color, maintaining firmness, and balancing total soluble solids (TSS) and titratable acidity (TA), indicating a delayed ripening process. Therefore, ripening delay paper synthesized from vegetable fiber and supplemented with 10 g of activated carbon per 1 kg of fruit was proven to effectively prolong mango shelf life by up to 3 days, demonstrating its potential as a biodegradable solution for postharvest quality preservation.
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Recovering bioactive compounds and antioxidant capacity of medium roasted spent coffee grounds through varied hydrothermal brewing cycles
(2025-04-01)
Maiyah, Nur
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Kerdpiboon, Soraya
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Supapvanich, Suriyan
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Kerr, William L.
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Sriprom, Pongsert
Spent coffee grounds (SCGs) are the residual product from brewing coffee and contain valuable bioactive compounds. This study investigated the effects of hydrothermal brewing cycles on the bioactive compounds and antioxidant capacity of medium roasted Arabica (A) and Robusta (R) SCGs. SCGs from A and R were prepared using 3 levels of brewing cycles at 92–95 °C/900 kPa. The SCGs were collected and air dried at 60 °C to achieve a moisture content of less than 4 % wb. Field emission scanning electron microscopy (FE-SEM) imaging showed that brewing increased SCGs porosity, allowing more moisture retention and enhanced extraction of compounds on subsequent cycles. SCGs also became less pigmented after additional brewing. Fourier-transform infrared (FTIR) spectra confirmed the retention of chemical components after each cycle, indicating a level of stability in the functional groups. Ethanol extraction yielded higher total phenolic content (TPC), while water extraction resulted in greater total flavonoid content (TFC); however, both decreased with additional hydrothermal brewing cycles. Caffeine and chlorogenic acid were more abundant in ethanol extracts, whereas water extracts exhibited stronger antioxidant activity (measured by ABTS and FRAP), particularly in Robusta SCGs. The bioactive compounds and antioxidant capacity were reduced with additional SCGs brewing. Significant correlations between TPC, TFC, caffeine, and antioxidant measures underscore the potential for the sustainable reuse of SCGs as a bioactive resource. Overall, hydrothermal brewing cycles enhanced the extraction and utilization of bioactive compounds from SCGs, contributing to the development of value-added products that promote health and sustainability.
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Study on chemical structure stability and properties of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels
(2024-12-05)
Manamoongmongkol, Kanjana
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Sriprom, Pongsert
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Narkrugsa, Woatthichai
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Phumjan, Lamphung
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Permana, Lasuardi
This study investigated the stability of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels prepared at different ratios after storage for three years. The physical hydrogel samples were studied using ratios of xyloglucan to chitosan between 1.5:1 and 4:1, comparing fresh hydrogel with hydrogel stored for three years. The hydrogels were analyzed for Fourier transform infrared characteristics, rheological behavior, flow rate, and zeta potential. After three years of storage, a reversible reaction was confirmed by C-H molecular stretching using Fourier transform infrared. All hydrogel samples exhibited pseudoplastic fluid characteristics with liquid-like behavior. The zeta potential of fresh hydrogel at 1.5:1 and 4:1 ratios was 27.700 ± 0.964 mV and 22.633 ± 0.929 mV, respectively, whereas after three years, it became 28.067 ± 1.106 mV and 18.867 ± 0.503 mV, respectively. The amount of xyloglucan significantly affected the zeta potential of the xyloglucan-chitosan hydrogel, leading to a decrease in the stability of the hydrogel at a 4:1 ratio. The stability of the hydrogel at a ratio of 1.5:1 was confirmed by pH and zeta potential measurements. In conclusion, the properties and behavior of the xyloglucan-chitosan hydrogel remained stable after three years of storage at a 1.5:1 ratio.
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Partial oxidation of synthesized wastewater containing lignin to vanillin and phenol under mild conditions
(2020-02-01)
Sriprom, Pongsert
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Leephisuth, Pornyamon
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Neramittagapong, Arthit
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Neramittagapong, Sutasinee
Partial oxidation of synthesized wastewater containing lignin to form phenol and vanillin was investigated. The reactions were carried out in a high-pressure reactor at various temperatures in the range of 140–200 ° C and under the air atmosphere with the initial air pressure of 2 bar for 75 min. The addition of NaOH has a strong effect on the formation of vanillin and phenol. The results showed that the highest vanillin concentration of 23.4 ppm and the highest phenol production of 30 ppm were obtained at a temperature of 140 °C and 200 °C, respectively. The vanillin and phenol can be produced from the partial oxidation of wastewater containing lignin at mild conditions.
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Optimization of betalain extraction from dragon fruit (Hylocereus undatus) peel and effect of pH on its properties
(2025-02-01)
Permana, Lasuardi
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Sriprom, Pongsert
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Manamoongmongkol, Kanjana
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Phumjan, Lamphung
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Assawasaengrat, Pornsawan
Dragon fruit peels are wastes produced in the food industry and contain abundant phytochemicals. In this study, betalain extraction from dragon fruit peels was optimized using water as a safe and environment-friendly solvent. The Box-Behnken design was used to investigate the effects of different pH (2.0–6.0), temperatures (30–60 °C), times (10–60 min), and solid-to-liquid ratios (1:15–1:40 by weight) on betalain extraction from dragon fruit peels. The betalain extracted under the optimized conditions was then studied for its properties across a wide pH range of 2.0 to 13.0. The results showed that the solid-to-liquid ratio had the most significant effect on betacyanin extraction as the major component of betalain in dragon fruit peels. The optimal extraction conditions were determined to be a pH of 3.6, temperature of 30 °C, extraction time of 10 min, and a solid-to-liquid ratio of 1:15. The expected betacyanin content under these conditions is 72.37 mg/L. A significant change in the CIELAB parameter of the extracted betalain was observed, with marked differences in the L*, a*, and b* values as the pH increased. This color change may be attributed to the degradation of betacyanin into betalamic acid. This study demonstrated the potential of a safe and eco-friendly process for extracting the natural pigment betacyanin from this agricultural waste material and the potential use of betalain in pH-dependent products.
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Assessment of overall remaining useful life of lubricants by integrating oil quality and performance
(2024-09-30)
Chokelarb, Wasan
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Sriprom, Pongsert
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Permana, Lasuardi
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Assawasaengrat, Pornsawan
Effective lubricant health monitoring programs are essential for extending the lifespan of both the lubricant and machinery. An accurate and reliable remaining useful life (RUL) prediction is necessary for maintenance decision support. The degradation of used lubricating oil information trends evaluated using used oil analysis results is necessary. This study addresses the need for a comprehensive tool to consolidate oil analysis parameters and determine the remaining useful life (RUL) of used lubricating oil (ULO). A Performance Rating Index (PRI) was developed by integrating various oil degradation testing parameters, including membrane patch colorimetry for varnish and sludge potential, along with viscosity, foaming stability, water separability, air release properties, oxidation stability, rust prevention, and copper strip corrosion. The integration of routine and performance test results of a turbine oil at 25,480 operating hours exhibited a PRI of 48.5. Correlating with the ASTM degradation alarm limits of 50 %, the PRI results provide clear maintenance actions before the original equipment manufacturer's recommended overhaul. The PRI approach supports proactive maintenance by facilitating early oil replenishment, extending RUL, and reducing waste oil.
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Optimization of Vanillin Production from Lignin Using Catalytic Depolymerization over a CuO/Al2O3 Catalyst
(2023-01-01)
Sangnak, Sirawit
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Neramittagapong, Arthit
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Neramittagapong, Sutasinee
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Theerakulpisut, Somnuk
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Sriprom, Pongsert
The optimal conditions for vanillin production from lignin depolymerization using CuO/Al2O3 catalysts were determined by combining Box-Behnken design (BBD) and response surface methodology (RSM). Independent variables, including temperature (80–140 °C), NaOH loading (0.5–1.5 g), time (30–90 min), and catalyst weight (0.5–1.5 g), were investigated to determine the optimal conditions, with the concentration of vanillin being the dependent variable. A CuO/Al2O3 catalyst was prepared by impregnation method. The vanillin obtained from the reaction was analyzed using high-performance liquid chromatography (HPLC). The maximum obtained vanillin concentration of 59.14 mg·L-1 was achieved with a temperature of 80 °C, a reaction time of 90 min, NaOH loading of 1.5 g, and 1.5 g of catalyst. The amount of NaOH was the most influential factor governing the obtained vanillin concentration. Regression analysis was performed to determine the formula describing the vanillin concentration in terms of the independent variables with a reasonable degree of accuracy (R2 = 0.87). This study shows that the optimal conditions for the depolymerization of lignin to vanillin over a CuO/Al2O3 catalyst can be achieved under milder conditions than those reported previously.

Sriprom, Pongsert

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