Chammui Y.,Pibulsongkram Rajabhat University
Food Analytical Methods | Year: 2017
The sample preparation methods such as the solid-phase microextraction (SPME) and the single-drop microextraction (SDME) for preconcentration of some endocrine disruptor chemicals (EDCs) leaching from baby milk feeding bottles were developed. Afterwards, all analytes were determined by using the GC-MS technique. The parameters affecting extraction efficiency of both methods including fiber coating, extraction time, extraction temperature, salting-out effect, desorption time, organic solvent, drop volume, pH of the solution, and stirring rate were also investigated. Under the optimum extraction conditions, the results from the developed methods revealed that the analysis time used was somewhat short (<8 min). The detection limits was low (LOD, 0.02–0.12 μg/mL for direct-SPME and 0.07–0.17 μg/mL for direct-SDME). The precision was slightly satisfactory (RSD, <5.9% of intra-day, <7.9% of inter-day for direct-SPME and <4.3% of intra-day, <4.7% of inter-day for direct-SDME). Moreover, the recoveries in both techniques were slightly high (85–102% for direct-SPME and 84–103% for direct-SDME). In this regard, both direct-SPME and direct-SDME methods could be used as alternative ways for the sensitive determination of some EDCs. Besides, the simple, rapid, and efficient features of the proposed method were demonstrated by the analysis of these compounds in aqueous solution. © 2017 Springer Science+Business Media New York
Apichartsrangkoon A.,Sudan University of Science and Technology |
Chattong U.,Pibulsongkram Rajabhat University |
Chunthanom P.,Rajamongkulitsan University
High Pressure Research | Year: 2012
The biologically active constituents of pennywort juice were analyzed by HPLC. The juice extract contained the bioactive glycosides, including asiaticoside and madecassoside. Antioxidant properties of juices were determined in terms of ferric-reducing antioxidant power assay, total polyphenol, β-carotene and ascorbic acid contents. After processing, asiaticoside, madecassoside and β-carotene in the extracted juice were relatively stable with no significant losses occurring. Pressurization could significantly retain ascorbic acid, polyphenols and antioxidant capacity than those pasteurization or sterilization. For storage assessment, asiaticoside in the processed juices was relatively stable during 4 months storage. Losses of ascorbic acid in the pressurized juice during storage were greater than in pasteurized and sterilized juice. However, the total amount of ascorbic acid retained in pressurized juice was still higher than those thermal-treated products. © 2012 Taylor & Francis.
Thogchai W.,Pibulsongkram Rajabhat University |
Liawruangrath B.,Chiang Mai University
International Journal of Cosmetic Science | Year: 2013
A simple micellar liquid chromatographic (MLC) procedure for simultaneous determination of arbutin and hydroquinone in medicinal plant extracts and commercial cosmetic products was proposed. This method was developed and validated. The chromatographic conditions were also optimized. All analyses were performed at room temperature in an isocratic mode, using a mixture of 1% (v/v) acetonitrile and 0.006 mol L-1 Brij 35 (pH 6.0) as a mobile phase. The flow rate was set at 1.0 mL min-1. The analytical column was a 150 × 3.9 mm Nova-Pak C-18 column. The effluent from the analytical column was monitored by UV detection at 280 nm. Under the optimum conditions, arbutin and hydroquinone could be determined within a concentration range of 2-50 μg mL-1 of arbutin, and hydroquinone was obtained with the regression equations; y = 0.045x + 0.042 (r2 = 0.9923) and y = 0.091x + 0.050 (r2 = 0.9930) respectively. The limits of detection were found to be 0.51 μg mL-1 and 0.37 μg mL-1 for arbutin and hydroquinone respectively. The proposed MLC method was applied for the determination of arbutin and hydroquinone contents in medicinal plant extracts and commercial cosmetic products. This proposed MLC method is thus suitable for routine analysis of arbutin and hydroquinone in the pharmaceutical formulations, cosmetic products and raw medicinal plant extracts. © ICS © 2013 Society of Cosmetic Scientists and the Société Française de Cosmétologie.
Poolprasert P.,Pibulsongkram Rajabhat University
Zootaxa | Year: 2014
Dachtylembia gen. nov. (Embioptera: Teratembiidae), is described and illustrated based on specimens of a new species (D. siamensis) collected from Thailand. The geographical distribution of this species in Thailand is mapped Copyright © 2014 Magnolia Press.
Suriyakat W.,Pibulsongkram Rajabhat University
Lecture Notes in Engineering and Computer Science | Year: 2015
Traditional statistical process control (SPC) techniques are based on the assumption that the observations are independent. In recent years, the autocorrelation is present in the data and can have an impact on the performance of the control chart. This paper considers the problem of monitoring the mean of a process in which observations can be modeled as autoregressive order p (AR(p)) process with exponential white noise. We propose EWMA control chart which is based on average run length by numerical integral equation method.
Srikaeo K.,Pibulsongkram Rajabhat University |
Sopade P.A.,University of Queensland
Carbohydrate Polymers | Year: 2010
Ten instant rice porridges made from Jasmine rice mixed with other ingredients purchased from commercial outlets in Thailand were studied for their functional properties and starch digestibility. The starch contents of the samples varied from 59-84 g/100 g dry solids. Differential scanning calorimetry showed a single endothermic peak located around 56-82 °C for most samples, indicating that starch was partially gelatinized during processing. However, two samples did not show any transition enthalpy to suggest that they were completely gelatinized during processing. Rice porridge samples with similar ingredients exhibited different pasting properties because of significant effects of processing and possibly the type of ingredients, and differences in their hydration/swelling behaviours. From in vitro starch digestion, the rice porridge samples were high glycaemic index (GI) foods with calculated GIs ranging from 68 to 97. Generally, rice porridges that were completely gelatinized gave the highest GI values because gelatinization, in the absence of pronounced retrogradation and molecular reorganization, enhances digestibility. The present study demonstrated the importance of non-rice ingredients in the functional and digestion properties of rice porridge samples, and the need to understand how spices, animal and plant proteins, flavour enhancers (e.g. monosodium glutamate), and flavourings influence GI of rice porridges so as to guide processing and selection of ingredients. © 2010 Elsevier Ltd. All rights reserved.
Chammui Y.,Pibulsongkram Rajabhat University
International Food Research Journal | Year: 2016
A single-drop microextraction (SDME) has been developed for the GC-MS determination of phenolic contents in water samples. Factors affecting extraction efficiency were studied including the organic solvent, ionic strength, drop volume, pH of the solution, stirring rate, temperature and time of extraction. Under the selected conditions, i.e., the organic solvent, ionic strength, drop volume, pH of the solution, stirring rate, extraction temperature and extraction time were hexyl acetate, 1% of NaCl, 2.5 μL of drop volume, pH 2, 200 rpm of stirring rate, 30°C of extraction temperature and 10 min of extraction time, respectively. After extraction step, the acceptor drop was withdrawn and directly injected into a GC-MS instrument for analysis. This method is a promising alternative for the sensitive determination of phenolic contents. In addition, the SDME also demonstrated that the method is simple, fast and efficiently for determining of phenolic contents from water.
Yiarayong P.,Pibulsongkram Rajabhat University
Gazi University Journal of Science | Year: 2016
In this paper, we study left ideals, left primary and weakly left primary ideals in Γ -LA-rings. Some characterizations of left primary and weakly left primary ideals are obtained. Moreover, we investigate relationships left primary and weakly left primary ideals in Γ -LA-rings. Finally, we obtain necessary and sufficient conditions of a weakly left primary ideal to be a left primary ideals in Γ -LA-rings. © 2016 Gazi University Eti Mahallesi. All rights reserved.
Keerin P.,Pibulsongkram Rajabhat University
2016 2nd Asian Conference on Defence Technology, ACDT 2016 | Year: 2016
The purpose of this research is to develop a business intelligence (BI) solution for personnel planning, with a case study of Thai university. It is generalized such that educational institutes and personnel departments of armed forces can adopt to manage military staffs more effectively. This can support the managerial decision making, with analysis of personnel administration and guidelines for operation. Personal achievement evaluation process is necessary to understand each employees abilities, competencies, and relative merits, which are crucial for an organizational success. The proposed BI framework consists of creating a data warehouse upon existing information repository. It also includes the development of intelligent report capability that allows customization of views to analyze and meet the needs of the management and related users. This is implemented as a well-designed form of requirement-specific information, such that the executive is able to acquire the correct and updated data through the Internet to support analysis, planning, efficient following up of overall operation. It is developed as a web based application, where MySQL Server is exploited as database management system and a module of ETL (Extract, Transform and Load) to turn transactional data into a data warehouse. In addition, the Online Analytic Processing (OLAP) technique is used to present the summarized data as a multidimensional cube. The experiment concludes that the development of this BI system can help the executives to get hold of the data more quickly and timely as required. Moreover, based on the survey with a group of users who have experiences with the system, the level of satisfaction is high. © 2016 IEEE.
Srisopa A.,Pibulsongkram Rajabhat University
Talanta | Year: 2016
Monodisperse porous poly(glycidylmethacrylate-co-ethylenedimethacrylate) (poly(GMA-co-EDMA) beads) with a diameter of 3 μm each were custom synthesized by a single-step swelling and polymerization method. Small sizes (1.2 μm) with polystyrene seed templates of low molecular weight were prepared by the addition of 1,1-diphenylethylene to control the polymerization reaction. Polystyrene seed particles were swollen directly by a mixture of methacrylate monomers and porogen. By swelling polystyrene seed particles with tetrahydrofuran as the porogen, a surface area of 108 m2 g-1 was achieved. The porous polymer microspheres were evaluated as stationary phase for liquid chromatography using superheated water as a mobile phase. Chromatographic performance at different temperatures was studied, along with analyte and column stability. The results confirm that the particles were stable under superheated water conditions. There was almost no change to the retention properties during the 160 sequential injections of a standard mixture (uracil, pyridine, phenol, dimethyl phthalate and N,N-dimethylaniline) at 150 °C. The chromatographic peaks show good symmetry with an efficiency of up to 47,000 plates m-1 under realistic separation conditions. Thermal decomposition of analytes (aldicarb sulfone, oxamyl, aldicarb and benomyl) separated under different column temperatures, was evaluate. Chromatograms of pesticide standard mixtures separated in the temperature range of 100-140 °C displayed good separation. The detection limits of 1.2 and 1.6 mg L-1 for benomyl and aldicarb were obtained when the separation was performed at 120 °C with flow rate of 0.4 mL min-1 water. However these pesticides were decomposed at the separation temperature above 140 °C. © 2015 Elsevier B.V. All rights reserved.