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ผลงานตีพิมพ์ในวารสารวิชาการFacile isolation and purification of thailandine, a biologically active oxoaporphine alkaloid, from Stephania venosa leaves using ion-pair liquid-liquid extractionผู้แต่ง: Chimnoi, N., Khunnawutmanotham, N., Feungfuloy, P.,  Ms.Kittima Chatrewongwan, Lecturer , Dr.Supanna Techasakul, Associate Professor , วารสาร:  
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Separation of Light and Middle-Heavy Rare Earths from Nitrate Medium by Liquid-Liquid Extraction) ผู้เขียน:Palakorn Satusinprasert, อัญชลี สุวรรณมณี, ดุษฎี รัตนพระ สื่อสิ่งพิมพ์:pdf AbstractSeparation of light (LREEs) and middle-heavy (M-HREEs) rare earths from a nitrate medium was studied using a liquid-liquid extraction technique. Tri-n- butyl phosphate (TBP) in kerosene was used as the extractant. The effect of the TBP concentration (30–80% volume per volume; v/v), contact time (3–10 min) and shaking speed (100–200 rpm) on rare earth extraction were investigated. The distribution ratio and separation factor were determined to evaluate the extraction behavior and the separation possibilities of M-HREEs from LREEs. The results showed that the distribution ratio increased with increasing TBP concentration. The concentration of rare earth in the aqueous phase decreased as the contact time and shaking speed increased. The separation factor values for M-HREEs/LREEs markedly increased as the atomic number of the LREEs decreased. High separation factor values were observed for Y/Nd, Y/Pr, Y/La of 6.35, 11.15 and 13.95 respectively. The best conditions for the separation in this study were found to be: a TBP concentration of 50% v/v, a contact time of 5 min and a shaking speed of 200 rpm. Under these conditions, it was possible to separate M-HREEs (Sm, Gd, Y) from LREEs (La, Pr, Nd). |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Hydroxychavicol and Eugenol Profiling of Betel Leaves from Piper betle L. Obtained by Liquid-Liquid Extraction and Supercritical Fluid Extraction) ผู้เขียน:Niramol Singtongratana, Sumontha Vadhanasin, Jirada Singkhonrat สื่อสิ่งพิมพ์:pdf AbstractThe chemical components of liquid-liquid extraction (LLE) and supercritical fl uid extraction (SFE) obtained from dried betel leaves (Piper betle L.) were determined and evaluated for the percentage extraction of hydroxychavicol (HC) and eugenol (EU). SFE was conducted at 60 ?C and a working pressure of 8 MPa (SFE1) and 6 MPa (SFE2. The chemical profiles were determined using high performance liquid chromatography (HPLC) with a method developed and validated for quantitative determination of HC and EU in the extracts from betel leaves. The analysis was carried out using HPLC on a Hypersil GOLD column (C18 with 250 ? 4.6 mm) using methanol-water (70:30 volume per volume) as the mobile phase under an isocratic system. The fl ow rate was 0.7 mL.min-1 and the detection was evaluated at the wavelength of 280 nm with a UV detector. The validation using hydroxychavicol (HC) and eugenol (EU) as a standard demonstrated a linear relationship (correlation coeffi cient = 0.997 and 0.998, respectively), with precision (relative standard deviation < 4%) in the concentration range of 40–100 ?g.mL-1 For HC and EU, the limit of detection was 1.0 and 0.1?g.mL-1, respectively, and the limit of quantifi cation was 2.0 and 0.2 ?g.mL-1, respectively. The highest extraction yield (15.6% weight per weight, w/w) and a high content of HC (9.1% w/w) were obtained by using ethyl acetate refl uxed extraction and LLE. A similar chemical profi le, regarding the HPLC fi ngerprint showed quality consistency by SFE1 with lower extraction yields. |
ผลงานตีพิมพ์ในวารสารวิชาการFluid-phase behavior of the guaiacol + CO2 system at high pressuresผู้แต่ง:Richards, J.R., Velez, J.G., Songtipya, L., Dr.Amporn Sane, Associate Professor , Thies, M.C., วารสาร: |
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