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| Articles
by
Piyanete Chantiratikul |
Total Records (
4 ) for
Piyanete Chantiratikul |
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Anut Chantiratikul
,
Songsak Chumpawadee
and
Piyanete Chantiratikul
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The effect of dietary Phosphorus (P) on nutrient and P digestibility in Thai-indigenousxBrahman crossbred cattle was studied. The experimental design was a 4x4 Latin square design with 21 days period. Four male crossbred cattle of about 1.5±0.5 years-old and weighing 220±30 kg were randomly received 1 of 4 dietary treatments containing 1.9, 2.4, 3.1 and 4.2 g P kg-1, respectively. The findings revealed that digestibilities of DM, OM, CP, NDF and ADF were not affected (p>0.05) by dietary P. However, P digestibility (818.71, 706.02, 625.25 and 537.90 g P kg-1 diet) decreased (p<0.05), but plasma P (35.36, 40.66, 46.97 and 55.42 mg L-1) increased (p<0.05) with increasing dietary P. The results indicated that dietary P affected (p<0.05) P digestibility and plasma P content in Thai-indigenousxBrahman crossbred cattle. The optimal dietary P for Thai-indigenousx Brahman crossbred cattle ranged from 1.7-3.1 g kg-1 diet. |
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Anut Chantiratikul
,
Panida Atiwetin
and
Piyanete Chantiratikul
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The feasibility of producing selenium-enriched water
lettuce (Pistia stratiotes L.) was studied by cultivating water
lettuce in Hoagland's solution containing 0, 20, 40, 60 and 80 mg Se from
sodium selenite/L. There were 4 replicates in each Se concentration. Each
replicate consisted of 30 plants of water lettuce. Three plants of water
lettuce in each replicate were sampled on day 0, 1, 2, 3 and 4 of the
experiment. The samples were washed with deionized water, separated for
leaves and roots and finally dried at 65 °C. Prior to Se determination,
leaf or root samples were pooled by replicate. The finding revealed that
Se concentrations in leaves and roots of water lettuce increased significantly
(p<0.05) with increasing Se concentration in Hoagland's solution and
day of cultivation. However, Se concentration in leaves was lower than
that of roots. Water lettuce cultivated in the solution containing 60
to 80 mg Se L-1 exhibited the yellow leaves and died in day
2 and 3. Therefore, the appropriate Se concentration and duration for
producing Se-enriched water lettuce were 20 to 40 mg Se L-1
and 2 to 3 days of cultivation. The leaves of water lettuce cultivated
in those conditions contained 11.14-13.50 and 21.06-29.55 mg Se kg-1,
respectively. |
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Piyanete Chantiratikul
,
Payungrat Meechai
and
Woranan Nakbanpotec
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The antioxidant activities and total phenolic contents of acetone/methanol extracts from Salvinia molesta and Eichornia crassipes were investigated. The antioxidant activities was evaluated by using scavenging of 2-2-Diphenyl-1-Picrylhydrazyl radical (DPPH·). The Total Phenolic Content (TPC) was evaluated according to the Folin-Ciocaltue assay and gallic acid was used as standard. The Flavonoids Contents (TFC) were evaluated by using the aluminum chloride method. As the result, extract from S. molesta exhibited the highest antioxidant activity with IC50 value of 27.75±0.15 μg mL-1 followed by extract from leaf of E. crassipes (IC50 value of 145.33±0.89 μg mL-1) and petiole of E. crassipes (IC50 value of 179.18±1.54 μg mL-1), repectively. The TPC and TFC of extracts were in the range of 39.58±0.38-69.97±0.38 mg GAE g-1 dw and 12.67±0.02-23.16± 0.08 mg QE g-1 dw, respectively. A High-Performance Liquid Chromatography (HPLC) method with photodiode array detection at 280 nm was used for identification and quantification. Nariginin was the major phenolic compounds (65.56-68.71 mg g-1 of crude extract) found in the extracts followed by myricetin (1.34-17.05 mg g-1 of crude extract) from S. molesta and E. crassipes. |
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Panadda Khomsug
,
Walaiporn Thongjaroenbuangam
,
Noppakun Pakdeenarong
,
Maitree Suttajit
and
Piyanete Chantiratikul
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The aim of this study was to determine the antioxidant activities, TPC and to identify phenolic compounds of seeds and pulped okra (Abelmoschus esculentus L.), a vegetable that is consumed worldwide because it plays an important role in the human diet by supplying carbohydrates, minerals and vitamins. The antioxidant activities of seeds and pulped okra were evaluated by DPPH radical scavenging and ABTS radical cation decolorization assays were used. Total Phenolic Content (TPC) was determined using the folin-ciocalteu assay. I dentification of phenolic compounds was achieved using HPLC with the UV-diode array detection. The TPC of pulped and seeds of okra extracts were 10.75±0.02 mg GAE/100 g e xtract and 142.48±0.02 mg GAE/100 g extract which corresponding with scavenging activities. The predominant phenolic compound was procycanidin B2, following procycanidin B1 and rutin in seeds but in pulped okra they were identified as catechin, procycanidin B2, epicatechin and rutin. These findings in associations with the high content of antioxidant activity and phenolics in okra enhance the importance of this food stuff for the human diet. |
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