单宁(Tannin)含量决定葡萄酒是否经久耐藏。单宁高的耐久存,单宁低的要尽快喝掉,通常不超过3~5年。葡萄梗、葡萄籽、葡萄皮、葡萄汁中都含有单宁,但葡萄酒中的优质单宁则主要来自于葡萄的汁和皮。葡萄籽含有许多单宁和油脂,但是单宁的收敛性强,不够细腻,而油脂又会破坏酒的品质,所以在酿制过程中必须避免弄破葡萄籽。梗的单宁也是收敛性强而且 Tannin content determines whether the wine is durable. Durable high tannin, low tannin to drink as soon as possible, usually not more than 3 to 5 years. Grapes, grapes, grape skins, grape juice contains tannin, but the wine’s quality tannin is mainly from the grape juice and skin. Grape seeds contain many tannins and oils, but tannins are astringent and not delicate enough. However, oils and fats can undermine the quality of the wine, so grape seed must be avoided during brewing. Terrier tannin is also astringent and strong