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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...
Adenanthera pavonina, known as Saga, is a tropical legume found in most parts of Asia. As per literature survey, it was found that the cooked Saga seeds, which can be easily digested by humans and livestock, are rich in fats and proteins. The seeds are used to cure boils and inflammations. It is also has an antibacterial property which then has been exploited to produce natural antibacterial liquid...
We discuss the fabrication and characterization details of an optical oxygen sensor for use in a cell culture microsystem. The sensor operates by measuring changes in the fluorescence intensity of (2-2'-bipyridine) dichlororuthenium (II) hexahydrate molecules that are immobilized in a silicone film. The sensor we demonstrate herein is highly linear, reversible, and is compatible with common biomedical...
In order to analysis of chlorogenic acid in Do-Zhong(Eucommia ulmoides), ultrasolic extraction was used to prepare the sample. With yield of chlorogenic acid as index. The effect of ethanol concentration, ultrasolic power, extraction time, and the ratio of solid to liquid were studied. The extracts were then analysis by high-performance liquid chromatographic (HPLC) method. The results shown that...
The present paper investigated the preparation and characterization of electrospun polyacrylic acid resin IV nanofiber. The electrospinnability of polyacrylic acid resin IV in N, N-Dimethylacetamide (DMAc), ethanol, methanol, and the mixed solvents of DMAc and methanol with different ratios were examined. Scanning electron microscope (SEM) was carried out to observe the morphology of the nanofibers...
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;...
A rapid general method for the determination of residual solvents in thiamine was studied. This paper demonstrated static headspace gas chromatography (HS/GC) with either flame ionization detection (FID) or mass spectrometry (MS) for the determination of volatile residual solvents in pharmaceutical products. The analytical method performance characteristics were investigated, including the repeatability,...
The activity behavior of Novozym 435 treated with organic solvents was investigated, and the influence of several crucial parameters, including Novozym 435 dosage, oil to methanol molar ratio, reaction time and type of monohydric alcohol, on biodiesel yield was also addressed using tert-butanol as co-solvent. The results showed that the functional group as well as log P of organic solvents was an...
Bisphenol A is not only an important chemical raw material, but also an environmental estrogen. This article examines the reactions of bisphenol A in sub-critical water. The experimental factors, such as ratio of solvent to BPA (8.0), temperature (270~330 °C), reaction time (5~60 min) and Sodium Chloride(NaOH) concentration (0~25 g·L-1) were investigated; The decomposition products were analyzed by...
In this paper, the transient absorbance spectra and kinetics characteristics of DBP are studied in 266 nm laser flash photolysis with three different mixed solvents. The transient species, assigned to DBP excited triplet, with maximum absorption at 300 nm were observed in deoxidation system meanwhile its decay process accelerated obviously in O2-statured system. By changing the concentration of DBP...
Isolation and identification of key components of the crude de-emulsifier produced by Bacillus mojavensis was studied. Organic solvent precipitation method was used to extract active ingredients from cell free broth. Crude products extracted by different solvent showed diverse de-emulsification activity. 84% and 73% of the de-emulsifier in cell free broth could be extracted successfully by using isopropanol...
In the present study, Eudragit L100 was successfully spun into ultrafine fibers using electrospinning process. The electrospinnability of Eudragit L100 in DMAc, ethanol, methanol, and the mixed solvents of DMAc and methanol with different ratios were examined. The morphologies of the as-spun Eudragit L100 fiber mats were observed using SEM. The results demonstrated that Eudragit L100 was able to be...
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