New technique to isolate anthocyanins from Delaware grapes by forming an aluminium complex using a Discovery DPA-6S.

New technique to isolate anthocyanins from Delaware grapes by forming an aluminium complex using a Discovery DPA-6S.

Food chemistry (2014-07-24)

Takayuki Asada, Yoriko Koi, Hirotoshi Tamura

ABSTRACT

An aluminium complex of crude Delaware grape anthocyanins, bearing an ortho-dihydroxyl group on the B ring and/or a p-coumaroyl group as an ester with flavocommelin, was formed and isolated by ethanol precipitation. Using a Discovery DPA-6S short column, selected anthocyanins were isolated to give cyanidin 3-glucoside (Cy3G, 48.2% yield with 95.2% purity) and cyanidin 3-(6-O-p-coumaroylglucoside) (Cy3-pC·G, 44.9% yield with 91.4% purity) from natural Delaware grape skin extracts without ODS-HPLC column chromatography. DPPH radical scavenging activity of the complex pigment was 3.4 ± 0.10 μmol TE/mg. Moreover, isolated pure anthocyanins from the complex pigment showed significantly higher DPPH radical scavenging activity [4.5 ± 0.08 μmol TE/mg (Cy3G) and 4.5 ± 0.04 μmol TE/mg (Cy3-pC·G), (p<0.05)].

MATERIALS

Product Number

Brand

Product Description

52625-U

Supelco

Discovery^® DPA-6S SPE Tube, bed wt. 250 mg, volume 3 mL, pk of 54

52626-U

Supelco

Discovery^® DPA-6S SPE Tube, bed wt. 250 mg, volume 6 mL, pk of 30

52627-U

Supelco

Discovery^® DPA-6S SPE Tube, bed wt. 500 mg, volume 6 mL, pk of 30

52631-U

Supelco

Discovery^® DPA-6S SPE Tube, bed wt. 2 g, volume 20 mL, pk of 20

52624-U

Supelco

Discovery^® DPA-6S SPE Tube, bed wt. 50 mg, volume 1 mL, pk of 108