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We demonstrate a low-power multi-pixel volatile compounds sensing platform dedicated to Internet of Things (IoT) applications, especially for environmental monitoring and industrial control. The transducers are made of interdigitated microelectrodes within a sensor array. Each pixel is independently functionalized by polypyrrole (PPy) electropolymerization performed in a back-end process in order...
Introduction of renewable energy resources especially Solar Photovoltaic (PV) supports the green economy requirements. Solar PV technologies have become the most prominent green energy resources towards Malaysia energy mix by the year 2020. Despite the significant reduction of carbon emission, Solar PV farm requires a huge open area for electricity generation and furthermore, the space under each...
Salicylamides, as well as O-substituted salicylamide, are classes of compounds with a broad spectrum of biological activity. The goal of this research was to evaluate the antioxidant capacity of some new 2-hydroxy-benzamide derivatives, esters, hydrazides and hydrazones using chemical and electrochemical methods. So, antioxidant activities of the synthesized compounds were studied by in vitro 1,1-diphenyl-2-picrylhydrazyl...
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...
Preliminary studies of Cabomba furcata from Chini Lake, Pahang, Malaysia has shown that this plant containing bioactive phytochemical such as saponin. Unfortunately no intensive research has been conducted since saponin are believed to have medicinal benefits to the humankind and they have the potential to be commercialized in pharmaceutical field. This study was done to identify the type of saponin...
Dried roots from Scrophularia ningpoensis Hemsl. Were extracted three times (solid: solvent = 1:7) with ethyl acetate, hexane and water to speparate phenolic compounds. e-carotene--linoleate bleaching, 1, 1-diphenyl-2-picrylhydrazyl (DPH) radical scavenging activities and activity of inhibition of corn oil oxidation were determined to evaluate the anti-oxidant activities of all extracts. The results...
Steady-state radiolysis experiments were performed to look into the decomposition and primary radiolytic degradation mechanism of electron beam (EB) -- irradiation nonylphenol (NP), which might be useful for the application of radiation for treating alkyl phenol-laden wastewaters. The study illustrated that the decomposition of NP in a methanol/water reduction system is higher than in an acetonitrile/water...
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...
A simple, rapid and reproducible HPLC method was used for the simultaneous determination of chlorogenic acid, baicalin and forsythin in Xiao'erjiebiao Granules, at the same time, response surface methodology (RSM) was devoted to forecast the best extraction technology. The HPLC System included an Agilent ZORBAX SB-C18 column ( 250 mm × 4.6 mm, 5µm ), acetonitrile (A) -- 0.4% ethylic acid (B) as mobile...
An analytical procedure based on capillary GC-MS was developed for the quantification and characterization of 2, 4-dimethylaniline and amitraz in fish muscle. It contained an n-hexane/methanol extraction step using accelerated solvent extraction (ASE), and a selected ion monitoring (SIM) detection system of capillary GC-MS. The ASE parameters were optimized (P = 120 bar, T = 60 oC) and GC-MS condition...
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...
Tinaspora crispa and Gelam (Melaleuca sp.) honey were identified as potential anti-proliferative agents due to presence of high antioxidant activity. In this research, human breast adenocarcinoma (MCF-7), human colorectal carcinoma (HCT116), human hepatocellular carcinoma (HepG2) and adenocarcinoma human alveolar basal epithelial (A549) cell lines were treated with both extracts and further diagnosed...
A high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method was developed for the raspberry ketone in raspberry. Raspberry ketone was extracted by hot refluxing method with methanol as extraction solvent. The purities in crude extract was removed by chemical method, and the aldehyde, ketone and other carbonyl compounds were isolated from crude extract. Qualitative and quantitative...
The antioxidant activities of extracts and residuum of Herba Leonuri fruits from supercritical CO2 extraction were determined in vitro. The residuum was extracted in turn with water, propyl alcohol and ethyl acetate. The antioxidant activities of the extracts were assayed with antioxidant capacity in linoleic acid model system, reducing powers, radical scavenging activity using 1, 1-diphenyl-2-picrylhy-drazyl...
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...
When cultured with Aspergillus niger, asiaticoside, purified from Centella Asiatica (L.) Urban, was metabolized into four metabolites including one novel alkaloid. A simple and rapid SPE-HPLC method for simultaneous determination of asiaticoside and its four metabolites in culture of A. niger was developed. The chromatographic separation was achieved on a Dikma Diamonsi C18 ODS column (200×4.6 mm...
The efficiency of different solid phase extraction (SPE) sorbents was studied for sample clean-up in the determination of bispyribac-sodium residues in rice grains. Three different SPE sorbents OASIS MAX, ProElut PXA and Supelclean ENVI-18 were used and compared. The clean-up performance was evaluated using high performance liquid chromatography with photodiode array detector. Oasis MAX sorbents was...
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...
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