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This work assessed the qualitative and quantitative polyphenols profile in a crude ethanol extract separated from spruce bark (two fractions with <0.25 and 1 mm diameter) using ultrasound assisted extraction (UAE) as a green extraction method. The evaluation of phenolic acids and condensed tannins profile was performed using instrumental (UV-VIS spectrometry), qualitative (Thin Layer Chromatography, TLC) and quantitative (HPTLC densitometry) methods. Using ultrasound assisted extraction (UAE) technique under specific parameters, the higher total phenolic content (TPC) was 29.785 mg GAE/g for spruce bark fraction with particle size <0.25 mm and 14.448 mg GAE/g for fraction with 1 mm diameters. The TLC assay of the crude ethanol extract was performed considering the standards: gallic, sinapic, p-coumaric and vanillic acids, catechin, epicatechin and tannic acid. Smaller material particle sizes lead to higher yield of polyphenols in ethanol extract. The quantitative evaluation by HPTLC densitometry revealed following amounts: sinapic acid 0.84 mg/g, p-coumaric acid 0.61 mg/g, catechin 1.03 mg/g, tannic acid 2.81 mg/g. Considering the chemical composition, the spread and availability, spruce bark could be considered as a resource with environmental and economic benefits.

revista de chimie

Contributions on Spruce Bark Polyphenols Identification Using Instrumental (UV-VIS Spectrometry), Qualitative (Thin Layer Chromatography) and Quantitative (HPTLC Densitometry) Methods