The distinctive flavor of grape wine originates from the grapes as raw material and subsequent processing operations . The grapes contribute trace elements of many volatile substances(mainly terpenes) which give the final product,the distinctive fruity character.In addition,they contribute nonvolatile compounds(tartaric and malic acids) which impact on flavor and tannins which give bitterness and astringency.The latter are more prominent in red wines as the tannin components are located in the grape skins.(Vullo et al.,2005)