Natural or synthetic sweeteners, source of wine adulteration. II. Studies on medium-sweet wine adulteration by adding synthetic sweeteners to marketable wines

anglais. Medium-sweet wine counterfeiting, based on dry and medium- dry wines, represents a possible practice in winemaking industry. The primary objective of the study conducted was to improve the TLC method-Thin Layer Chromatography, by replacing the cellulose layer, recommended by STAS 6182 (17-8), with silica gel, fluorescein included. This type of layer which coats an aluminium foil removes the spraying action of fluorescein in order to detect spots of synthetic sweeteners. Another objective of this paper was the detection of synthetic sweeteners by using TLC-60254 plates, in the case study conducted on a lot of 16 wine samples which were purchased. Among the analyzed medium-sweet wine samples we identified two adulterated wines, namely sample 8, which was obtained from medium-dry wine with addition of saccharin in order to be included in the category of medium-sweet wines, and wine sample 9, for which a dry wine was used, to which an unidentified sweetener was added with 0,29 Rf.

roumain; moldave. Imitarea vinurilor demidulci, pornind de la vinuri seci si demiseci, este o practica posibila in industria vinului. Studiul intreprins a avut un prim scop imbunatatirea metodei TLC- Thin Layer Chromatography, prin inlocuirea suportului de celuloza, recomandata in STAS-ul 6182 (17-8), cu silicagel, avand fluoresceina inclusa. Acest tip de suport etalat pe folie de aluminiu elimina operatiunea de pulverizare a fluoresceinei pentru identificarea spoturilor de indulcitori sintetici. Un alt scop al prezentei lucrari l-a constituit depistarea indulcitorilor sintetici prin utilizarea placilor de TLC-60254, in studiul de caz, efectuat pe un lot de 16 probe de vin, procurate din comert. In probele de vinuri demidulci analizate au fost identificate doua vinuri falsificate, si anume proba 8, care s-a obtinut dintr-un vin demisec, la care s-a efectuat o corectie cu zaharina, pentru incadrarea in categoria vinurilor demidulci, si proba de vin cazul careia s-a utilizat un vin sec, la care s-a adaugat un indulcitor neidentificat, cu Rf-ul de 0,29.