Abstract An analytical method using gas chromatography isotope ratio mass spectrometry (GC-IRMS) combined with solid phase micro-extraction (SPME) was developed to measure the δ 13C values of six typical volatiles commonly occurring in wine (isoamyl acetate, 2-octanone, limonene, 2-phenylethanol, ethyl octanoate and decanoate) for first time. SPME selected a divinylbenzene/carboxen/polydimethyl...

This study aims to determine the results of measuring uric acid levels using POCT and chemistry analyzer as gold standard simultaneously. The research method used was cross-sectional with a sample 47 adults at Harapan Doa Hospital, Bengkulu City. selection based on non-probability consecutive sampling. showed that level measured by Chemistry 6.2 mg/dL. subjects hyperuricemia detected device wer...

Materials and general procedures. All of the chemicals are commercial available, and used without further purification. Elemental analyses of C and H were performed with an EA1110 CHNS-0 CE elemental analyzer. The IR (KBr pellet) spectra were recorded (400-4000 cm-1 region) on a Nicolet Magna 750 FT-IR spectrometer. Thermogravimetric analyses (TGA) were carried out in an air atmosphere with a h...

In this study, the nano-SiO2/hexamethylenetetramine as a new basic heterogeneous nanocatalyst was prepared and used for the synthesis of pyranopyrazole via the four-component reaction. Various aldehydes, hydrazine hydrate, ethyl acetoacetate and malononitrile were reacted at room temperature under solvent-free and grinding conditions. The morphology and structure of nano-cat...