On the diophantine equation $x^2 + b^y = c^z$

Yuan, Pingzhi; Jia-bao, Wang

doi:10.4064/aa-84-2-145-147

Cited by 74 publications

(88 citation statements)

References 2 publications

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“…The stock solution containing isovitexin (3,195.00 mg/mL), spinosin (5,191.00 mg/mL), swertisin (6,201.00 mg/mL), 6-phydroxybenzoylspinosin (8,166.00 mg/mL), 6 000 -p-coumaroylspinosin (10,198.00 mg/mL) and 6 000 -feruloylspinosin (11,196.00 mg/mL) in methanol was prepared. The stock solution was diluted with methanol to provide a series of different concentrations in the range of 0.39-195.00 mg/mL for 3, 0.38-191.00 mg/mL for 5, 0.40-201.00 mg/mL for 6, 0.33-166.00 mg/mL for 8, 0.40-198.00 mg/mL for 10 and 0.39-196.00 mg/mL for 11.…”

Section: Preparation Of Standard Solutionsmentioning

confidence: 99%

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Quantitative analysis and chromatographic fingerprinting of the semen zizyphi spinosae by ultra‐high‐performance liquid chromatography coupled with diode‐array detector

Niu

Zhang

2011

J of Separation Science

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A simple and sensitive method was developed and validated for fingerprint analysis of semen zizyphi spinosae (SZS) and simultaneous determination of six flavonoids in SZS by ultra-high-performance liquid chromatography coupled to diode-array detector (DAD). The analysis was performed on an Agilent ZORBAX Eclipse Plus C18 RRHD column. The column was maintained at 40°C and the eluents were monitored with DAD at 270 nm. A gradient elution of acetonitrile and water containing 20 mM sodium dihydrogen phosphate was used. The solvent flow rate was 0.4 mL/min. The method was validated. Standard calibration curves showed good linear behaviors (r=1.000) in the range of 0.33-201.00 μg/mL. Acceptable intra-day precision (RSD<1.9%), inter-day precision (RSD<4.0%), repeatability (RSD<4.1%) and recovery in the range of 97.4-104% were obtained. The validated method was successfully applied to obtain the chromatographic fingerprints and the contents of six flavonoids in 23 samples of SZS. The principal component analysis (PCA) had been applied for the chromatographic fingerprint analysis and quantitative analysis of six flavonoids to classify and discriminate the 23 samples of SZS. These results demonstrated that the method was very suitable in the analysis and quality control of SZS.

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Section: Preparation Of Standard Solutionsmentioning

confidence: 99%

“…Spinosin and 6 000 -feruloylspinosin, which are the primary bioactive constituents in SZS, play a great role in the effects of sedation and hypnosis [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis and chromatographic fingerprinting of the semen zizyphi spinosae by ultra‐high‐performance liquid chromatography coupled with diode‐array detector

Niu

Zhang

2011

J of Separation Science

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“…Experiments were performed using thermogravimetric differential thermal analysis (TG- , 9 (1), 2014, 61 Copyright © 2014, BCREC, ISSN 1978-2993  Normal grain growth [13]  One dimensional diffusion…”

Section: Methodsmentioning

confidence: 99%

“… Three dimensional diffusion [13]  Avrami I equation [6]  Avrami II equation [6]  Phase boundary reaction: Cylindrical symmetry.…”

Section: Bulletin Of Chemical Reaction Engineering and Catalysismentioning

confidence: 99%

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Kinetic Model of LiFePO4 Formation Using Non-Isothermal Thermogravimetric Analysis

Halim

Widiyastuti

Setyawan

et al. 2014

Bull. Chem. React. Eng. Catal.

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The formation reaction of LiFePO4 from decomposition of precursors LiOH, FeSO4.7H2O and (NH4)2HPO4 with mole ratio of Li:Fe:P=1:1:1 was investigated. The experiment was carried out by thermogravimetric differential thermal analysis (TG-DTA) method using nitrogen as atmosphere at a constant heating rate to obtain kinetic constant parameters. Several heating rates were selected, viz. 5, 7, 10, 15, 17.5, 22.5 and 25 °C min -1 . Activation energy, pre-exponential factor and reaction order were taken using Kissinger method and obtained 56.086 kJ/mol, 6.95×108 min -1 , and 1.058, respectively. Based on fitting result between reaction model and experiment were obtained that reaction obeyed the three dimension diffusion model.

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A facile asymmetric synthesis of 1-amino-2,2,2-trifluoroethanephosphonic acid

2000

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Starting from the fundamental building block, trifluoromethylated N‐(−)‐α‐methylbenzylacetimidoyl chloride, an asymmetric synthesis of 1‐amino‐2,2,2‐trifluoroethanephosphonic acid was conveniently achieved by a base‐catalyzed [1,3]‐proton shift reaction of the intermediate dialkyl 1‐imino‐2,2,2‐trifluoroethanephosphonate. © 2000 John Wiley & Sons, Inc. Heteroatom Chem 11:536–540, 2000

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On the diophantine equation $x^2 + b^y = c^z$

Cited by 74 publications

References 2 publications

Quantitative analysis and chromatographic fingerprinting of the semen zizyphi spinosae by ultra‐high‐performance liquid chromatography coupled with diode‐array detector

Quantitative analysis and chromatographic fingerprinting of the semen zizyphi spinosae by ultra‐high‐performance liquid chromatography coupled with diode‐array detector

Kinetic Model of LiFePO4 Formation Using Non-Isothermal Thermogravimetric Analysis

A facile asymmetric synthesis of 1-amino-2,2,2-trifluoroethanephosphonic acid

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