Fig. 1

Visual colour representation of oxy-Hb from five human blood samples. a Hb of the non-diabetic individual A. b–e Hb of the diabetic patients B to E, respectively. In all cases, sample number 1 refers to non-ozonated Hb, while samples number 2, 3 and 4 are related to ozone treated Hb with 15, 35 and 55 μg/ml of ozone, respectively, for 5 min