Forty-six phenolic compounds were newly identified in bilberry extracts.
Caffeoyl derivatives and quercetin hexuronide were major components in leaves.
A-type and B-type trimers contribute to 30% in stems.
Procyanidin analysis revealed a low mDP (2–4) and epicatechin as the main unit for all.
Phenolic contents were highly correlated with the TPC and the antioxidant activity.