Montedoro G, Miniati E
S TA NU. 1976 May-Jun;6(3):177-80.
A method is proposed for the differentiation of natural red wines from those obtained by addition of oenocyanine to white wines. The procedure is based on the determination of tannin phenolics and nontannin phenolics by selective precipitation with methyl cellulose and subsequent estimation of the intensity of absorption at 450 nm and 520 nm. The sum of ratio: mg/1 non tannin phenolics/absorption at 450 nm X 1000 and mg/1 tannin phenolics/absorption at 520 nm X 1000, furnishes values which are in correlation with the origin of two wines and such as to consent their differentiation.
提出了一种区分天然红葡萄酒与通过向白葡萄酒中添加花青素获得的红葡萄酒的方法。该程序基于通过甲基纤维素选择性沉淀来测定单宁酚类和非单宁酚类，随后估计450nm和520nm处的吸收强度。比率之和：mg/1非单宁酚类/450nm处的吸收×1000与mg/1单宁酚类/520nm处的吸收×1000，得出的值与两种葡萄酒的来源相关，从而能够区分它们。
