Essays about: "liquid column"
Showing result 6 - 10 of 42 essays containing the words liquid column.
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6. Investigation of Adsorption and Retention of Charged Compounds In RPLC
University essay from Karlstads universitet/Institutionen för ingenjörs- och kemivetenskaper (from 2013)Abstract : The adsorption isotherm of two weak bases, Promethazine hydrochloride and Propranolol hydrochloride, were determined with isocratic reversed-phase liquid chromatography, with a 60 w% methanol in 20 mM sodium acetate buffer pH 4 as the mobile phase, and calculated by the elution by characteristic points method. The data obtained from the method were then fitted into the Langmuir isotherm and the electrostatically modified Langmuir. READ MORE
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7. The effect of temperature on the chemical stability of Vitamin C in a cosmetic product – Development of an HPLC-method for quantitative analysis
University essay from KTH/Tillämpad fysikalisk kemiAbstract : Vitamin C är en populär ingrediens i hudvårdsprodukter, bland annat på grund av dess positiva effekter på kollagen-produktionen i huden och dess antioxidativa egenskaper. Dessvärre är vitamin C en känslig ingrediens som lätt bryts ned av ljus, syre, hög temperatur eller fel pH-värde. READ MORE
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8. Effects of pharmaceutical excipients on the chemical stability of therapeutic proteins in a parenteral formulation
University essay from Lunds universitet/Livsmedelsteknik och nutrition (master)Abstract : Proteins and peptides are widely used for the prevention, management, and cure of various illnesses. This vast therapeutic potential represents a significant portion of the pharmaceutical industry in the form of vaccines, antibodies, enzymes, and other protein-based therapeutics. READ MORE
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9. A study of the adsorption isotherms of Ion-pair reagents
University essay from Karlstads universitetAbstract : In this project, the optimization of obtaining adsorption isotherms for the ion pair reagent, tributylamine was tested. The goal was to have a better understanding of the chromatographic process when separating biomolecules, such as oligonucleotides. READ MORE
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10. Analysis of polyfunctional thiols in beer : Developing a novel method of extraction and analysis using GC-FID
University essay from Lunds universitet/Livsmedelsteknik och nutrition (master)Abstract : In this project, attempts were made to identify and quantify two polyfunctional thiols – 4-mercapto-4-methyl-pentanone and 3-mercaptohexyl acetate – and three monoterpene alcohols – linalool, geraniol, and β-citronellol – in beer samples. In order to avoid the use of hazardous compounds such as dichloromethane and hydroxymercuriobenzoate, common in traditional methods, two novel techniques were tested: a pure liquid-liquid extraction of the beer samples with cyclohexane, and a liquid-liquid extraction with cyclohexane followed by solid phase extraction on silver ion columns. READ MORE