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A flow injection method for the determination of l-arginine and l-ornithine based on the inhibition of l-histidine crystallization was developed. The open-closed system used permits turbidimetric multidetection of the signal in the crystallization of l-histidine in the presence of an organic solvent (2-propanol). The proposed method permits the selective determination of l-arginine (0.3-12 mg l...
A new analytical method that combines on-line isolation-preconcentration, extraction and gas-liquid chromatography was developed for the determination of sterols in oils and fats. A silica gel column permits the isolation of sterols together with triglycerides (25%) which were further transesterified with acetyl chloride-methanol to fatty acid methyl esters. The proposed method was applied to the...
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