نتایج جستجو برای: gas chromatographymass spectroscopic studies
تعداد نتایج: 1684878 فیلتر نتایج به سال:
Infrared predissociation spectroscopy of ion-solvent clusters has allowed us to examine the effects of sequential hydration on the reactivity of cations such as NO, NO2, and protonaled formaldehyde, H2COH, stable gas phase ions which are known to undergo rapid reactions in aqueous solution. Our experiments demonstrate that these ions undergo hydration reactions at critical cluster sizes. The sm...
Polyfluorenes reveal a complex interplay between emissive properties and intraand intermolecular structure. Vibrational frequencies and intensities determined by Raman spectroscopy are strongly influenced by variations in the backbone as well as side chain conformations. Changes in the structural and electronic properties of two side group substituted polyfluorenes (PF): ethyl-hexyl substituted...
Rhanterium epapposum, native to the Arabian Peninsula, is traditionally used cure skin infections. The objective screen phytochemical content and antimicrobial activity of aqueous, methanol 80% extracts aerial parts R. epapposum. screening methanolic, epapposum was conducted using gas chromatographymass spectrometry. activities were assessed by well diffusion microdilution methods. Qualitative ...
Present study aims the optimisation and validation of the extraction procedures for the determination of polycyclic aromatic hydrocarbons (PAHs) in sediment samples. As analytical techniques, gas chromatographymass detector (GC-MS) and gas chromatography-flame ionization detector (GC-FID). The optimized methods were soxhlet extraction, ultrasonic bath extraction and solid phase micro extraction...
Purpose: To establish an efficient method to recycle natural borneol from Cinnamomum camphor chvar. Borneol oil residue. Methods: The fractions and raffinate of the oil residue of Cinnamomum camphor chvar. Borneol were obtained by fractional distillation, and analyzed by gas chromatography with flame ionization detector (GC-FID) and gas chromatographymass spectrometry (GC-MS). Natural borneol w...
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