Five purple potato varieties (Blaue Elise, Blaue St. Galler, Blue Congo, Valfi and Vitelotte) and four red flesh potato varieties (Highland Burgundy Red, Herbie 26, Rosalinde, Rote Emma) were stored for nine months and analysed for the polyphenols, anthocyanins, reducing sugars and antioxidant activity with two different methods viz. ABTS and DPPH. After additionally in prepared potato chips oil content, texture and colour parameters were evaluated.