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Ageing assessment of transformer paper insulation is important due to its irreversible ageing nature. Due to the poor accessibility of the paper samples in field transformers, large efforts were made to seek for chemical parameters in oil to indicate paper ageing, e.g. furanic compounds and dissolved carbon oxides. In recent years, alternative parameters including methanol and ethanol in oil were...
This paper reports the synthesis, characterization, application, and photo-physical properties of a novel polyamidoamine zero generation dendrimer (G0) modified with two derivatives of 1,8-naphthalimide. The chemical structures of synthesized dendrimers were confirmed using FTIR, \(^{\mathrm { {1}}}\) <bold>HNMR</bold>, \(^{\mathrm {{13}}}\) CNMR, UV-Vis, and DSC techniques. The photo-physical...
Effects of extraction solvent on the extraction yields of polyphenolic contents (total phenolic, flavonoid, anthocyanins and tannins contents) and antioxidant activitity of the Osmanthus fragrans' seed were examined for the first time. The extraction solvent included water and methanol, ethanol, acetone (30%, 70% and 100% v/v, respectively). The antioxidant activities of different solvent extractions...
This study was conducted to evaluate the effects of different extraction methods on the major flavonoid content of raw and steamed Scutellariae radix by applying high-performance liquid chromatography. Eight extraction methods such as extraction method in 2010 Chinese Pharmacopoeia (ChP-method), water refluxing extraction (WTRE-method), 60% ethanol refluxing extraction (ETRE-method), ultrasonic-assisted...
The enantiomeric separations of three neonicotinoid insecticides (compounds 1, 2, and 3) were performed on a Chirobiotic V chiral column by high-performance liquid chromatography (HPLC) under a new-polar mobile phase mode, using methanol and ethanol with triethylamine as the basic additive as the mobile phase. Compound 1 obtained no separation under all the mobile phase, while compound 2 and 3 were...
A convenient route for the synthesis of adenosine uses hypoxanthine, which is obtained easily and low prices, and phosphorus oxychloride as starting materials was proposed. The route involved three steps as chlorination, condensation and aminolysis, respectively. The reaction condition is mild and the overall yield is higher than other conventional chemical synthesis methods. Firstly, 6-chloropurine...
A salting-out phase separation microextraction /liquid chromatography method was used for the simultaneous determination of three phenols in water, including α-naphthol, β-naphthol and bisphenol A. The chromatographic conditions: Diamonsil C18 column (5μm, 150×4.6 mm i.d.) was used; The column temperature was room temperature; The mobile phase was methanol / water (57:43); The flow rate was 1.0 mL/min;...
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