Vidigal, Susana S. M. P.Rangel, António O. S. S.2015-02-102015-02-102014VIDIGAL, Susana ; RANGEL, António O. S. S. - A flow injection system coupled to a micro-guard cartridge for monitoring a vinification process. Analytical Sciences. ISSN 0910-6340. Vol. 30, Nº11 (2014), p. 1057-10620910-6340http://hdl.handle.net/10400.14/16576The present paper describes a flow-injection system coupled to a Micro-Guard cartridge and a miniaturized optical CCD detection system used to monitor the sugars (glucose/fructose) and ethanol content during alcoholic fermentation. The carrier stream (mobile phase) is composed of an aqueous sulfuric acid solution. The flow parameters were studied in order to obtain a good resolution and a wide dynamic concentration range, with a good repeatability. The relative standard deviation (RSD) obtained was inferior to 4%, for n = 3. It was possible to achieve a linear range of up to 12 g L(-1) of sugars and up to 2% (v/v) of ethanol with a detection limit of 2.3 g L(-1) and 0.4% (v/v), for sugars and ethanol concentrations, respectively. The proposed system was successfully applied to monitor a vinification process by the quantification of sugars and ethanol, and also in some finished port wines.engEthanolSugarsPort wineSynthetic grape juiceAutomationjournal article10.2116/analsci.30.10571348-2246WOS:000345547400005