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By Zoecklein

Winemaking as a kind of nutrients preseIVation is as previous as civilization. Wine has been an critical portion of people's day-by-day nutrition for the reason that its discovery and has additionally performed a massive position within the improvement of society, reli­ gion, and tradition. we're at present ingesting the simplest wines ever produced. we will do that as a result of our elevated realizing of grape transforming into, biochemistry and microbiology of fermentation, our use of advert­ vanced know-how in construction, and our skill to degree some of the significant and minor elements that include this attention-grabbing beverage. traditionally, winemakers succeeded with sluggish yet sluggish advancements led to through combos of folklore, obseIVation, and success. How­ ever, in addition they had huge mess ups leading to the need to dis­ pose of wine or convert it into distilled spirits or vinegar. It was once assumed that even the main marginally drinkable wines might be advertised. this isn't the case for modem manufacturers. the prices of grapes, the expertise utilized in creation, oak barrels, corks, bottling gear, and so on. , have in­ creased dramatically and proceed to upward push. shoppers at the moment are conversant in provides of cheap and top quality varietals and blends; they con­ tinue to call for higher. Modem winemakers now depend upon simple technology and xvi Preface xvii the systematic software in their paintings to supply items exciting to the more and more a professional customer base that enjoys wine as a part of its civilized society.

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1990; Cuvelier et al. 1992; Frei et al. 1989; Freisleben and Packer 1993; Halliwell and Cross 1991; Jackson 1993;Jackson et al. 1993;Jenkins 1993; Laughton et al. 1989; LeWitt 1993; Maxwell et al. 1993; Miller et al. 1993; Poli et al. 1993; Pryor 1991; Rose and Bode 1993; Scott et al. 1993; Shahidi et al. 1992; Sinclair et al. 1990; Stocker et al. 1990; Torle et al. 1986; Tsukamoto 1993; Vanella et al. 1993; Yoshikawa 1993). Indeed antioxidants have been found to protect a plethora of systems, in vitro, ex-vivo, and in vivo, from the ravaging attacks of harmful substances, both endogenous and exogenous, to which we are exposed on a daily basis (Babbs 1990; Bowling et al.

In these instances, NO forms a nitrosothiol adduct that is ideally suited to perform its ascribed duties. Albumin also exerts protective action against spent antioxidants. However, albumin does not easily cross all cell membranes; salicylic acid and its metabolites 2,3- and 2,5-dihydroxybenzoic acids apparently do. Because of their molecular structure, wine constituents such as DHBs, cyanidin, epicatechin, gallic acid, quercitin, resveratrol, and salicylic and other hydroxybenzoic acids seem ideally suited to quench or inactivate oxoperoxonitrite (Koppenol and Bartlett 1993), as well as the other abovementioned reactive and cell damaging species.

Thus, in characterizing an antioxidant in grapes or wine, one must be careful and cognizant of the above constraints before making claims on a compound as an antioxidant in humans simply because such compound might work in vitro or ex vivo (Halliwell 1993e; Muller and Fugelsang 1994c). Antioxidant-Pro-oxidant Another question that must be asked is: What happens to an antioxidant once it has performed its defensive duties? In most instances, unfortunately, our knowledge of their biological fate is not fully understood.

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