Chemical analysis and antibacterial activity of grape (Vitis vinifera) seed extracts

Abstract

Grape seed extracts have several effects on hosts in terms of anti-inflammatory and antimicrobial effects. The many international studies focused on different species. The present study focused on the local species of grape (Vitis vinifera). The seeds were collected from local plants and alcoholic and aquatic extracts were obtained from grape (V. vinifera) seeds. The antibacterial effect of these extracts was evaluated against different bacterial species. The results showed that the alcoholic extract has antibacterial ability while, aquatic extract do not have this attribute. Alcoholic extract was examined by Fourier Transform Infrared Spectroscopy (FTIR) and it was found that the extract has many main bonds at 3450 /cm which represent NH2 groups, 3008 /cm that represents frequency asymmetrical patterns of aromatic group C-H, 2925/cm represented frequency patterns of alphatic bond of CH group, 1745/cm which is the patterns match the frequency of the ester anhydrate group (C=O) and at 1649/cm and 1618 /cm represent the frequency of pattern of group C=C [12]. It can concluded that the compounds that mentioned above play an important role in biological activity of alcoholic grape seed extracts in terms of antibacterial activity.