| Title: | Effect of freeze-drying and oven-drying on volatiles and phenolics composition of grape skin |
| Author(s): | de Torres C; Diaz-Maroto MC; Hermosin-Gutierrez I; Perez-Coello MS; |
| Address: | "Area de Tecnologia de Alimentos, Facultad de Ciencias Quimicas, Universidad de Castilla La-Mancha, Campus Universitario, s/n, 13071 Ciudad Real, Spain. mariacarmen.detorres@uclm.es" |
| DOI: | 10.1016/j.aca.2009.10.005 |
| ISSN/ISBN: | 1873-4324 (Electronic) 0003-2670 (Linking) |
| Abstract: | "Grape skins are the part of the fruit with the highest amount of volatile and polyphenolic compounds. Volatile compounds give the fruit and other grape derivatives their flavour. Polyphenolic compounds are responsible for the colour of the fruit, juice and wine, and also act as very important natural antioxidant compounds. Dehydration is a method used to prevent the damage of these compounds over time. Nevertheless, in the case of volatile compounds, removing water can cause compound degradation or the evaporation of such compounds. This work studied two drying methods, freeze-drying and oven-drying, at 60 degrees C, as skin preservation methods. The skins from two grape varieties, Carmenere and Cabernet Sauvignon, were dried. Many volatile compounds, which are of interest in the aroma profile, were identified in both varieties as terpenes (linalool, etc.), sesquiterpenes (farnesol), norisoprenoids (vitispirane, etc.), C(6) alcohols (1-hexanol, etc.), etc., and their amount decreased significantly with the oven-drying method, in contrast to the freeze-drying method. Both phenolic compounds, anthocyanins and flavonols, were identified in fresh and dehydrated samples, thus resulting in the freeze-drying method being less aggressive than oven-drying methods" |
| Keywords: | "Chromatography, Gas/*methods Chromatography, High Pressure Liquid/*methods *Freeze Drying Phenols/*analysis/chemistry Temperature Vitis/*chemistry Volatile Organic Compounds/*analysis/chemistry;" |
| Notes: | "Medlinede Torres, C Diaz-Maroto, M C Hermosin-Gutierrez, I Perez-Coello, M S eng Research Support, Non-U.S. Gov't Netherlands 2010/01/28 Anal Chim Acta. 2010 Feb 15; 660(1-2):177-82. doi: 10.1016/j.aca.2009.10.005. Epub 2009 Oct 8" |
