Ruengwit Sawangkeaw
@chula.ac.th
The Institute of Biotechnology and Genetic Engineering
Chulalongkorn University
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Wasin Pattaraprachyakul, Ruengwit Sawangkeaw, Somkiat Ngamprasertsith, and Inthawoot Suppavorasatit
MDPI AG
Defective green coffee beans are typically discarded due to their negative impacts on coffee qualities compared to normal beans. However, there are some types of defective beans that can cause volatile aroma compounds after roasting similar to those produced by normal beans. This study aimed to optimize conditions for coffee oil extraction by supercritical carbon dioxide using the response surface methodology (RSM). Furthermore, the investigation assessed the aroma-active compounds and sensory quality in extracted coffee oil. Thus, operational temperatures (33.2–66.8 °C), pressure (10–30 MPa) and ethanol (g) to roasted coffee (g) ratio (0.25:1–1.5:1) were optimized for coffee oil extraction. As a result, different oil yields with different key volatile aroma compounds concentrations were obtained and it was found that the optimum conditions for extraction were a temperature of 50 °C, pressure of 30 MPa, and ethanol (g) to roasted coffee (g) ratio of 1:1 to obtain 6.50% (w/w) coffee oil yield. Key volatile aroma compounds, including furfuryl alcohol, 5-methyl furfural, 2,5-dimethylpyrazine, 4-vinylguaiacol, furfuryl acetate, 3-ethyl-2,5-dimethylpyrazine, thiazole, 1-furfurylpyrrole, pyridine, 2,3-butanediol, and 3-methyl-1,2-cyclopentanedione which contributed to the most preferable burnt, sweet, bready, chocolate-like, and roasted flavors, were quantified. Overall, the results suggested that coffee oil extracted from defective beans could be potentially used as a flavoring agent.
Panusorn Hunsub, Kanokporn Ponmana, Somkiat Ngamprasertsith, Winatta Sakdasri, Aphichart Karnchanatat, and Ruengwit Sawangkeaw
Springer Science and Business Media LLC
Winatta Sakdasri, Piraya Sila-ngam, Supitcha Chummengyen, Atitaya Sukruay, Somkiat Ngamprasertsith, Wirasinee Supang, and Ruengwit Sawangkeaw
Elsevier BV
Winatta Sakdasri, Panisara Arnutpongchai, Supasuta Phonsavat, Eakarach Bumrungthaichaichan, and Ruengwit Sawangkeaw
Elsevier BV
Wirasinee Supang, Somkiat Ngamprasertsith, Winatta Sakdasri, and Ruengwit Sawangkeaw
Elsevier BV
Pragatsawat Chanprapai, Thanaporn Wichai, Sarintip Sooksai, Sajee Noitang, Weradaj Sukaead, Winatta Sakdasri, and Ruengwit Sawangkeaw
MDPI AG
To reduce the burning of lemon basil straw (LBS)—the byproduct of basil seed production—we propose utilizing LBS as a replacement substrate for mushroom cultivation. LBS can stimulate both mycelial growth and percentage biological efficiency; however, the rigidity of this material limits particle size reduction. In this work, aqueous extractions were facilely performed without using either hazardous chemicals or complex procedures to valorize LBS as a stimulator for gray oyster mushroom cultivation. An aqueous extraction at solid-to-liquid of 50 g/L was employed. The macerated-LBS and decocted-LBS extracts were tested for mycelial growth in potato dextrose agar and sorghum grains. Following this, both aqueous extracts were applied as a wetting agent in cylindrical baglog cultivation to estimate mycelial growth, biological efficiency, and productivity. It was found that LBS extracts insignificantly enhanced the mycelia growth rate on all media, while the diluted LBS (1:1 v/v) extracts improved 1.5-fold of percentage biological efficiency. Gas chromatograph-mass spectrometer results indicated 9-octadecaenamide is a major component in LBS aqueous extract. Results demonstrated that the LBS extract is a good stimulator for the production of Pleurotus mushroom.
Thanaporn Wichai, Sarintip Sooksai, Sajee Noitang, Weradej Sukaead, Pragatsawat Chanprapai, Jittra Piapukiew, Aphichart Karnchanatat, and Ruengwit Sawangkeaw
Springer Science and Business Media LLC
Winatta Sakdasri, Somkiat Ngamprasertsith, Pongrawee Saengsuk, and Ruengwit Sawangkeaw
Elsevier BV
Somkiat Ngamprasertsith, Weradaj Sukaead, Séverine Camy, Jean-Stéphane Condoret, and Ruengwit Sawangkeaw
Faculty of Engineering, Chulalongkorn University
Tanate Tongbuekeaw, Ruengwit Sawangkeaw, Sumate Chaiprapat, and Boonya Charnnok
Springer Science and Business Media LLC
Ittirit Phichaion, Ruengwit Sawangkaew, Winatta Sakdasri, and Somkiat Ngamprasertsith
Faculty of Engineering, Chulalongkorn University
Glycerol is a by-product of biodiesel production. Every three moles of biodiesel produced, glycerol is released in one mole, which is around 10 wt.% of the total products. The crude glycerol from supercritical transesterification has a higher purity than that from alkaline transesterification. Monoglyceride is an anionic surfactant widely used in many applications. In this work, the glycerolysis reaction of palm oil and glycerol was studied using isopropanol as the solvent. The investigated important parameters in this study were reaction time in range of 30-150 minutes, reactor loading in range of 40-80 %, and molar ratio of isopropanol to glycerol to palm oil in range of 0-30. The glycerol to palm oil molar ratio was constant at 5 to 1. The results showed that parameters affected conversions and yields were reactor loading and solvent addition. The highest monoglyceride yield, 37.4%, was obtained at 260 ̊C in 150 minutes and 40 % of reactor loading. Molar ratio of glycerol to palm oil to isopropanol is 5:1:15. A central composite design (CCD) of 48 experiments investigated the effects on monoglyceride content (%MG) of temperature (220 to 260 ̊C), reaction duration (30 to 150 min), and molar ratio of IPA to palm oil (0:1 to 30:1). The %MG was substantially and statistically significantly enhanced (p < 0.0001) at higher temperatures and longer reaction duration. An analysis of variance confirmed that the molar ratio of IPA to palm oil had a much less significant effect (p = 0.0255) on %MG. The crude glycerol obtained from a biodiesel production plant was compared with pure glycerol at the optimal condition. A %MG of 46.58% was observed using crude glycerol as reactant because of the yield-limiting effects of water in crude glycerol.
Winatta Sakdasri, Cholada Komintarachat, Ruengwit Sawangkeaw, and Somkiat Ngamprasertsith
Faculty of Engineering, Chulalongkorn University
Supercritical transesterification of lipid-based biomasses, a recent technique to produce biofuel without a catalyst, is discussed. This review focused on a glycerol-free process. The supercritical reactants include dimethyl carbonate, diethyl carbonate, methyl acetate, ethyl acetate (ETA), and methyl tert-butyl ether. The by-products from the glycerolfree process can improve both the quantity and quality of the resultant biofuel. This review suggests that supercritical transesterification of lipid-based biomasses using ETA as a coreactant can provide the most valuable advantages, as involves inexpensive and renewable resources, which are important for biofuel production and sustainability.
Boonya Charnnok, Ruengwit Sawangkeaw, and Sumate Chaiprapat
Elsevier BV
Chanatip Samart, Surachai Karnjanakom, Chaiyan Chaiya, Prasert Reubroycharoen, Ruengwit Sawangkeaw, and Metta Charoenpanich
Elsevier BV
Winatta Sakdasri, Somkiat Ngamprasertsith, Sarintip Sooksai, Sajee Noitang, Weradaj Sukaead, and Ruengwit Sawangkeaw
Elsevier BV
Winatta Sakdasri, Somkiat Ngamprasertsith, Sirisopa Daengsanun, and Ruengwit Sawangkeaw
Elsevier BV
Somkiat Ngamprasertsith, Jaripong Menwa, and Ruengwit Sawangkeaw
Elsevier BV
Winatta Sakdasri, Ruengwit Sawangkeaw, and Somkiat Ngamprasertsith
Elsevier BV
W. Sakdasri, R. Sawangkeaw, and S. Ngamprasertsith
FapUNIFESP (SciELO)
The biofuel production from used palm oil (UPO) using supercritical ethanol (SCE) at low molar ratio was investigated in order to produce an entirely renewable fuel. The effects of the reaction time and ethanol to oil molar ratio were considered from 0.5 to 10 min and 6:1 to 18:1, respectively. The optimal parameters were 10 min and a 12:1 molar ratio, representing a remarkable reduction from 42:1 for the conventional SCE process. Because of the high operating temperature, the triglycerides conversion rate reached 99%, and the glycerides content met the international specification for biodiesel. However, an ester content of 70% was obtained at optimal conditions. The side reaction between glycerol and ethanol demonstrated a positive effect in increasing fuel yield by 8.15%. The product can be considered an alternative biofuel instead of biodiesel.
Winatta Sakdasri, Ruengwit Sawangkeaw, and Somkiat Ngamprasertsith
Wiley
A large energy input for preheating and recovering of high excess alcohols used are the main issue in the supercritical methanol (SCM) process. This work demonstrated the production of biofuel from used palm olein oil in SCM using a low methanol to oil molar ratio. The effects of the operating temperature (350–400 °C), methanol to oil molar ratio (9:1–12:1), and reaction time (2–10 min), and their reciprocal interactions were evaluated using a central composite design. The optimum process conditions were determined to be a temperature of 395 °C, methanol to oil molar ratio of 12:1, and reaction time of approximately 9 min through the use of response surface methodology. The modified quadratic regression model demonstrated that the triglyceride conversion (%XTG) and methyl ester content (%FAME) were sensitive to changes in the operating temperature and reaction time, while the effect of the methanol to oil molar ratio was minimal. Under the optimal operating conditions, the predicted values of %XTG and %FAME were 100% and 63.67%, respectively, which were in good agreement with the experimental values. The fuel properties of biofuel obtained from optimal conditions were examined and then compared to American and European standards for biodiesel. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.
Winatta Sakdasri, Ruengwit Sawangkeaw, Yaocihuatl Medina-Gonzalez, Séverine Camy, Jean-Stéphane Condoret, and Somkiat Ngamprasertsith
American Chemical Society (ACS)
The phase behavior of the methanol–palm oil system was first experimentally assessed in the temperature range of 363–393 K and pressure range of 1–4 MPa. Second, comparative modeling of the phase equilibrium of the methanol–tripalmitin system was performed using the Peng–Robinson equation of state (PR EoS) with second-order modified Huron–Vidal (MHV2) mixing rules, in combination with the universal functional activity coefficient model (UNIFAC) and the universal quasi-chemical (UNIQUAC) excess Gibbs free-energy model. The agreement between experimental and modeling results was found to be satisfactory when MHV2 mixing rules are used in combination with the UNIQUAC model. Finally, the thermodynamic model was applied to predict fluid phase equilibria of palm oil transesterification with supercritical methanol. From the isochoric method in the temperature range of 373–693 K and the pressure range of 1–16 MPa, the model was found to predict global mixture behavior.
Somkiat Ngamprasertsith, Sasithorn Sunphorka, Prapan Kuchonthara, Prasert Reubroycharoen, and Ruengwit Sawangkeaw
Springer Science and Business Media LLC
Winatta Sakdasri, Ruengwit Sawangkeaw, and Somkiat Ngamprasertsith
Elsevier BV
Cholada Komintarachat, Ruengwit Sawangkeaw, and Somkiat Ngamprasertsith
Faculty of Engineering, Chulalongkorn University
The non-catalytic interesterification of palm oil in supercritical ethyl acetate in continuous system to produce biofuel is complex to understand thermodynamic properties during extreme condition, particularly density of two reactants. In this study, an indirect procedure for density measurement of palm oil and ethyl acetate mixture in a batch system at high temperature and pressure was experimentally investigated using isochoric method. Its apparatus comprise a constant volume reactor which was individually loaded with a mixture of ethyl acetate and palm oil in different molar ratios (10:1 to 30:1) and global densities (0.26 to 0.53 g/cm3). During temperature increment, the changing of pressure was recorded in real-time to obtain the pressure-temperature relationship. After measuring the change of pressure at various global densities, the pressure-temperature related specific global density diagram was successfully constructed. At high global densities and high molar ratios of ethyl acetate to palm oil, the transition point took place closing to the estimated critical point of the mixture. The results will be further employed as database for accurately residence time calculation in continuous reactor, especially for biofuel production from palm oil in supercritical ethyl acetate.