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Chanthaburi, Thailand

Gorinstein S.,Hebrew University of Jerusalem | Poovarodom S.,King Mongkuts University of Technology Thonburi | Leontowicz H.,Warsaw University of Life Sciences | Leontowicz M.,Warsaw University of Life Sciences | And 6 more authors.
Food Research International

The aim of this research was to investigate the bioactivity of durian, snake fruit and mangosteen, rare exotic Thai fruits. These fruits were compared among them and with conventional fruits: durian with mango and avocado, and snake fruit with mangosteen and kiwifruit in order to find the preferable diet for human consumption. The contents of polyphenols, flavonoids, flavanols, tannins, anthocyanins, ascorbic acid and carotenoids, and the level of antioxidant potential by ABTS, DPPH, FRAP and CUPRAC in different extracts (methanol, water, acetone, and hexane) were determined. The presence of polyphenols (flavonoids and phenolic acids) in the investigated samples was characterized by Fourier transform infrared (FT-IR) spectroscopy and three-dimensional fluorimetry (3D-FL).The in vivo studies were carried out on 25 male Wistar rats, divided into 5 diet groups, each of 5. During 30. days of the experiment the rats of all 5 groups were fed basal diet (BD), which included wheat starch, casein, soybean oil, vitamin and mineral mixtures. The rats of the Control group were fed only the BD. The BD of the other 4 groups was supplemented with 1% of nonoxidized cholesterol (NOC) (Chol group), 1% of NOC in each group and 5% of lyophilized fruits: durian (Chol/Durian), snake fruit (Chol/Snake), mangosteen (Chol/Mangosteen). After the experiment diets supplemented with exotic fruits significantly hindered the rise in plasma lipids and hindered the decrease in the plasma antioxidant activity. In conclusion, the contents of bioactive compounds and the antioxidant potential are relatively high in the studied fruits and varied among them depending on the extraction procedure. FT-IR and 3D-FL can be used as additional tools for identification and comparison of bioactive compounds. Supplementation of diets with exotic fruits positively affects plasma lipid profile and antioxidant activity in rats fed cholesterol-containing diets. © 2010 Elsevier Ltd. Source

Hondo K.,Ehime University | Sukhumpinij P.,Rambhai Barni Rajabhat University | Kakihara F.,Ehime University
Scientia Horticulturae

The aim of this study was to produce a yellow-flowered geranium (Pelargonium×hortorum Bailey). Interspecific crosses between white-flowered geraniums and Pelargonium quinquelobatum Hochst. ex A. Rich. were performed. Unilateral incompatibility was observed, such that normal seeds were obtained when P. quinquelobatum was used as the seed parent, whereas no seeds were obtained when P. quinquelobatum was used as the pollen parent. The F1 progeny produced sterile pollen; therefore, genome doubling of the F2 progeny was induced by colchicine treatment to ensure fertile pollen; F3 progeny were also produced. The F3 progeny were crossed with tetraploid geraniums to produce BC1 and BC1F2 progeny. The flower color of the hybrid progeny were pale yellow, ranged from green-yellow 1D to yellow 3C, according to the Royal Horticultural Society Color Chart, and became increasingly the value of the colorimetric parameter b* with advancing generations. The pigmentation of the pale yellow flowers involved a large amount of flavonols and a small amount of carotenoids: the main pigments were kaempferol or quercetin. The quercetin contents were significantly correlated with the b* value (r=0.82, P<0.001), whereas no correlation was found between the kaempferol or carotenoids contents and the b* value. Furthermore, the b* value was unaffected by the aluminum content or the pH value in the petals. © 2015 Elsevier B.V. Source

Moonrungsee N.,Rambhai Barni Rajabhat University | Pencharee S.,Ubon Ratchathani University | Jakmunee J.,Chiang Mai University

A field deployable colorimetric analyzer based on an "Android mobile phone" was developed for the determination of available phosphorus content in soil. An inexpensive mobile phone embedded with digital camera was used for taking photograph of the chemical solution under test. The method involved a reaction of the phosphorus (orthophosphate form), ammonium molybdate and potassium antimonyl tartrate to form phosphomolybdic acid which was reduced by ascorbic acid to produce the intense colored molybdenum blue. The software program was developed to use with the phone for recording and analyzing RGB color of the picture. A light tight box with LED light to control illumination was fabricated to improve precision and accuracy of the measurement. Under the optimum conditions, the calibration graph was created by measuring blue color intensity of a series of standard phosphorus solution (0.0-1.0 mg P L-1), then, the calibration equation obtained was retained by the program for the analysis of sample solution. The results obtained from the proposed method agreed well with the spectrophotometric method, with a detection limit of 0.01 mg P L-1 and a sample throughput about 40 h-1 was achieved. The developed system provided good accuracy (RE<5%) and precision (RSD<2%, intra- and inter-day), fast and cheap analysis, and especially convenient to use in crop field for soil analysis of phosphorus nutrient. © 2015 Elsevier B.V. All rights reserved. Source

Potipat J.,Burapha UniversityChonburi | Potipat J.,Rambhai Barni Rajabhat University | Tangkrock-Olan N.,Burapha UniversityChonburi | Helander H.F.,Gothenburg University

The sediment samples from 24 stations in coastal area of Chanthaburi Province were collected during March 2012 to March 2013 and analyzed for heavy metal contents (Pb,Cd, Ca, Fe, Cu and Zn), pH, onganic matters and grain sizes. The correlation analyses showed that heavy metal conceatrntions were affeeted by the content of organic matter and the size of clay particles. The evoluation of the quality of sediment was carried out using the geoaccumulation index (Igeo)and the enrichment factor (EF) as well at the comparison with those in t4e Thailand’s sediment quality guideiine (SQG) values. The results oe the geoaccumulation index and the enrichment factor values of the heavy metals content in the sediments revealed that the study area was unpolluted and not enriched, respectively. The relationship between the heavy metals concentration and the organic matter, and the clay particle wns proposed try using the multiple regression equations. © 2015 Thai Society of Higher Eduation Institutes on Environment Source

Lertsakwimarn K.,Rambhai Barni Rajabhat University | Phongcharoenpanich C.,King Mongkuts University of Technology Thonburi
Lecture Notes in Electrical Engineering

A low-profile ultrahigh frequency (UHF) passive radio frequency identification (RFID) tag for the applications to distinguish metallic from non-metallic is presented. The proposed antenna structure consists of T-shaped structure and parasitic parallel longitudinal strip lines which are placed symmetrically. There is an air gap between the head parts of T-shaped structure for installing IC chip. The head part has shorting pin that connects the ground plane. The parametric studies are described. From the results, the tag antenna with defected ground plane has larger difference of maximum read range compared between the tag on metallic plate and the tag in free space. The proposed UHF-RFID tag antenna can adjust the impedance characteristic by changing the length of the middle longitudinal strip. The tag antenna prototype is fabricated with an area of 90 × 20 × 3 mm3 (0.28λ0 × 0.06λ0 × 0.009λ0). The measured results of maximum read range on the metallic plate and in free space are 83 and 24 mm, respectively. The simulated and measured results of the proposed RFID tag antenna are discussed. © Springer International Publishing Switzerland 2016. Source

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