Tukey’s post-hoc test confirmed that yield increased with length of maceration but at 60 C, and, especially for anthocyanins and tannins, there seemed to be a reduction beyond 20 h due to thermal degradation, or polymerization which may influence analytical quantification. Effect of temperature cannot be generalised since it strongly depends on typology of compounds. For example,found a maximum of 30–35 C for extraction of anthocyanins from ribes with ethanol 85%; while indicated 20 C, 0 C and 0 C for the highest yields of ethanolic extraction of carnosic acid, ursolic acid, and oleanolic acid, respectively, from Balm leaves. On the other hand, it was shownthat drying red grape pomace peels at 60 C did not significantly affect the stability of polyphenols and antioxidant activity, and, indeed, it was reported an increase in the antioxidant capacity of grape extract by means of a simple thermal treatment at 60 C, due to phenols polymerization