Phenolic composition of bark tannin from Taurus Cedar (Cedrus libani)

Abstract

Phenolic composition of bark tannin from Taurus Cedar (Cedrus libani)Abstract Aim of study: In this study, tannin extraction from waste barks was performed which occur as a result of logging production of Taurus cedar tree (Cedrus libani A. Rich.) that grows naturally in our country. The phenolic composition of the cedar bark tannin was introduced by analytical methods and FTIR analysis.Area of study: Extraction of tannin from waste wood bark, characterization of phenolic compound and determination of industrial use possibilities.Material and Methods: The bark sample of Taurus cedar from Adana district was extracted from bark:water ratio of 1:8 (w/w) at 70 °C for 1 hour. Extraction yield, pH and stiasny number values were determined at the extract solution. Then, phenolic composition of the tannin was investigated by total phenol content, butanol:HCl assay, DNS reducing sugar method, and FTIR analysis.Main results: As a result of extraction, tannin yield and stiasny number value were determined 8.99 % and 28.85, respectively. The results of total phenol content were 15.20 mg/g in ether phase and 27.77 aqueous phase. According to butanol-HCl assay, 7.61 mg/g proanthocyanidin content was found and 41.77 mg/g reducing sugar power were assayed by DNS reducing sugar method. FTIR spectra of the tannin was observed that presence of the characteristic peak for condensed tannin at 1605 cm -1 . Research highlights: Phenolic compound analysis methods and FTIR analysis revealed that the the bark tannin of taurus cedar contained flavonoid units, which are monomeric building units of condensed tannins.

Phytochemicals and Bioactivities of Cedrus Libani A. Rich

“…Tannins were extracted from waste wood barks of Taurus cedar trees, and their yield was 8.99%, whereas the total phenol content, proanthocyanidin (condensed tannin) content, and reducing sugar were 27.77, 7.61, and 41.77 mg/g, respectively 43 .…”

Combining artificial neural network and moth-flame optimization algorithm for optimization of ultrasound-assisted and microwave-assisted extraction parameters: Bark of Pinus brutia

“…Condensed tannins, are also called proanthocyanidins (Kemppainen et al 2014). Reducing sugar content by DNS method determine the amount of free sugars seen as impurities in the extracts (Gönültaş and Sarialan 2017). Low impurity is desired for obtaining high purity tannins.…”