Phosphoric Acid
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The highest luminescence product consists of spheroidal and relatively uniform particles with sizes around 0.6-1.0 µm. The variation of the precipitated precursor with temperature, the influence of sintering temperature on structure and luminescence, the mineralization role of boric acid and the chemical reactions that occur with generation of precipitated precursors and upon heating to give luminescent solid solution products are mentioned.
10p dianmotminh02 03-05-2024 2 1 Download
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Trong nghiên cứu này, acid phosphoric đã được sử dụng làm tác nhân thủy phân để chuyển hóa cellulose tồn dư trong bùn thải của nhà máy giấy thành dịch đường. Sau đó, dịch đường được lên men với vi khuẩn Acetobacter xylinum để tổng hợp cellulose vi khuẩn (BC). Các yếu tố ảnh hưởng đến quá trình thủy phân được tiến hành khảo sát thông qua các thí nghiệm để tìm ra điều kiện phù hợp.
6p kimphuong1135 18-10-2023 5 3 Download
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The purpose of the present study was to investigate the efficiency of phospholipid removal using phosphoric acid and tra catfish (Pangasianodon hypophthalmus) oil bleaching using activated carbon.
9p vidoctorstrange 06-05-2023 5 4 Download
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This paper reviews treatment methods for water reclamation, acid/base regeneration from wastewater and phosphorous recovery from municipal wastewater to achieve sustainable development. The treatment options are discussed and novel treatment processes are proposed based on a literature review.
8p vidoctorstrange 06-05-2023 3 3 Download
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"Chromatographic fingerprint analysis of herbal medicines: Thin-layer and high performance liquid chromatography of Chinese drugs (Vol.4)" represents the most comprehensive overview to analytical studies of those herbal drugs on the market and therefore serves as a must-have manual for researchers and laboratories dedicated to TCM. The quality proof of the investigation meets the standard of the European Drug Regulatory Authority. This volume 4 is divided into 2 parts, please refer to part 2!
111p damtuyetha 16-02-2023 6 1 Download
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Giáo trình Sinh hóa (Nghề: Bảo vệ thực vật - Cao đẳng): Phần 1 - Trường Cao đẳng Cộng đồng Đồng Tháp
Giáo trình Sinh hóa trang bị cho sinh viên những kiến thức cơ bản, làm nền tảng để sinh viên có cơ sở đi sâu học tập, nghiên cứu về môn sinh hóa, cung cấp kiến thức để sinh viên dễ dàng tiếp thu các kiến thức sinh học khác như sinh lý, di truyền, vi sinh….Mời các bạn cùng tham khảo nội dung phần 1 giáo trình.
64p canhdongco25 02-08-2022 17 6 Download
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Bài giảng Hóa sinh đại cương: Chương 4 - ThS. Đinh Ngọc Loan cung cấp cho học viên các kiến thức về định nghĩa nucleic acid; cấu trúc nucleic acid; base pyrimidine; đường Pentose; acid phosphoric; DNA và RNA; cơ chế tái bản DNA;... Mời các bạn cùng tham khảo chi tiết nội dung bài giảng!
40p bachkhinhdaluu 10-12-2021 24 2 Download
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Sugarcane bagasse as an agricultural/industrial biomass was converted into a low-cost activated carbon via an acid activation procedure under optimized conditions. Phosphoric acid was applied as a cost-effective and environmentally friendly chemical activator. The optimized activated carbon produced under temperature of 550°C and impregnation ratio of 1.5 showed a micromesoporous structure with specific surface area and pore volume of 972.5 m2/g and 0.43 cm3/g, respectively.
16p tudichquannguyet 29-11-2021 8 0 Download
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Four composites of hydroxyapatite/hydrolyzed polyacrylamide (HAP/HPAM-n) were prepared using an in situ wet chemical method. The synthesis was performed by preparing a suspension of calcium in a copolymer solution having a known HPAM concentration. Phosphoric acid was added dropwise to each suspension to obtain HAP/HPAM-n composites. The effect of initial copolymer amount on the composite properties was investigated using XRD, FTIR, TGA, and SEM/EDS analysis. The obtained results were compared to the HAP sample synthesized under the same conditions and without copolymer.
16p tudichquannguyet 29-11-2021 8 1 Download
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A simple and reliable HPLC method was developed and validated for determination of rofecoxib in bovine serum albumin microsphere. The analyses were performed on a C18 column (150 x 4.6 mm, 5 µm particle size) at room temperature with UV detection at 272 nm. The mobile phase was composed of acetonitrile-0.1% o-phosphoric acid solution in water (1:1, v/v) mixture, and flow rate was set to 1 mL/min. The method was validated according to the international guidelines with respect to stability, linearity range, limit of quantitation and detection, precision, accuracy, specificity, and robustness.
9p tudichquannguyet 29-11-2021 9 1 Download
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Các chất có hoạt tính phytoestrogen: puerarin, daidzin, glycitin, genistin, miroestrol, daidzein, glycitein, genistein được chiết ra khỏi nền mẫu thực phẩm bảo vệ sức khỏe (TPBVSK) sử dụng dung môi methanol chiết rung siêu âm tại nhiệt độ 40℃. Quá trình phân tích được thực hiện trên thiết bị HPLC Alliance e2695 (Waters) sử dụng cột pha đảo C18 Reliant (250 mm × 4,6 mm; 5 µm), nhiệt độ cột 30°C, tốc độ dòng 1,0 mL/phút kết hợp detector PDA, chương trình gradient pha động sử dụng 2 kênh: kênh A là acid phosphoric 0,1%/nước và kênh B là methanol trong vòng 45 phút.
9p viwendy2711 05-10-2021 28 2 Download
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Phương pháp sắc ký lỏng hiệu năng cao (HPLC) được xây dựng để định lượng đồng thời 02 hoạt chất gồm quecertin và kaempferol trong viên nang cứng cao lá hồng. Mẫu thử được thủy phân trong ethanol 70o với xúc tác HCl đặc và tiến hành phân tích với cột pha đảo C18 (250 x 46 mm, 5µm), rửa giải theo chương trình gradient với pha động là methanol và dung dịch acid phosphoric 0,43%, tốc độ dòng 1mL/phút, thể tích tiêm 10µL.
11p vijoy2711 18-09-2021 27 1 Download
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A simple, stable, and specific high-performance liquid chromatography coupled with a DAD detector (HPLC-DAD) method has been developed and validated for the simultaneous determination of amlodipine, felodipine, furosemide, nifedipine, and spironolactone in traditional herbal products. The analytes were extracted in acetonitrile: water (50 : 50, v/v) with help of the ultrasonic. The separation of analytes was performed in an Apollo C18 column (250 × 4.6 mm; 5 µm) and a mobile phase consisting of mixture acetonitrile: 0.1% phosphoric acid in gradient elution.
10p chauchaungayxua12 11-07-2021 12 1 Download
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Enhancement in phosphorus (P) efficiency of crop plants require a better understanding of alterations in root architecture phenes and physio-biochemical processes under phosphorus deprived condition. This study analyzed the morpho-physiological and biochemical alterations associated with P efficiency of crop. Six pigeonpea [Cajanus cajan (L.) Millsp] genotypes (AL1758, AL1817, AL201, H005, ICPL93081, and ICPL88039) were tested under two P treatments [P fertilizer not added in soil and recommended dose of P (Single Super phosphate @ 250kg/ ha)].
15p trinhthamhodang1218 26-02-2021 20 2 Download
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This paper investigated the effect of important factors on SLMSD performance to recover indium from etching solution such as: pH of feed solution, extractant (Di-(2-ethylhexyl) phosphoric acid (D2EHPA)) concentration, oxalic acid concentration. It was found that 99.5 % In3+ was removed from feed solution in about 20 minutes with high concentration factor (4.5) under suitable conditions (pH 1; 0.6M Di-(2- ethylhexyl) phosphoric acid (D2EHPA), 2 wt% oxalic acid).
6p nguaconbaynhay10 19-02-2021 9 2 Download
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Nanorod hydroxyapatite (HA) was synthesised from eggshells by using a microwave-assisted technique. With eggshells and phosphoric acid as precursors, the reaction was carried out in a microwave with an irradiation power of 800 W for 45 minutes. The effects of Ca/P molar ratios and the power of microwaves were investigated. The obtained hydroxyapatite was characterised by X-ray diffraction (XRD), scanning electron microscope (SEM), and infrared spectroscopy (IR). The nanorod-like HA samples were 20-40 nm in diameter and 130-180 nm in length.
4p nat_qb73 21-02-2021 9 1 Download
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Since the acid sulphate soils of Kuttanad is an important problematic area with extreme acidity, toxicity of iron, aluminium coupled with deficiency of phosphorous, application of different amendments and other nutrients should be used for successful cultivation in these area.
8p cothumenhmong9 18-01-2021 14 1 Download
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High-performance liquid chromatography coupled with a photodiode array detector (HPLCDAD) has been reported to quantify isolated compounds. This work was designed, therefore, to develop an HPLC-DAD system to determine luteolin in the extract solutions from Helicteres hirsuta. Luteolin was analyzed on an RP-C18 column using a mobile phase including acetonitrile – 0.1% phosphoric acid (v/v) = 1:1 (v/v) with a detecting wavelength of 347 nm, a flow rate of 0.5 mL/min, and a volume of an injected sample of 10 μL.
5p nguaconbaynhay9 03-12-2020 7 0 Download
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Bài viết thực hiện xác định đồng thời hàm lượng rutin, hesperidin, quercetin trong một số mẫu thực phẩm bảo vệ sức khỏe dạng rắn bằng phương pháp sắc ký lỏng hiệu năng cao. Điều kiện sắc ký sử dụng cột Agilent Zorbax Eclipse XDB C18 (250 x 4,6 mm; 5 µm); detector DAD ở bước sóng 280 nm với hesperidin, 254 nm với rutin và quercetin; pha động: acetonitril - dung dịch acid phosphoric 0,1% (gradient).
7p kethamoi9 01-12-2020 29 0 Download
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Biofertilizers play a significant role in fixing atmospheric nitrogen, production of growth promoting substances and making phosphorous available to the plants hence the application of biofertilizers is very essential to the plant (Upadhayay et al., 1999).
8p nguathienthan8 20-10-2020 11 2 Download