Isolation and bioactivities of organic acids and phenols from walnut shell pyroligneous acid

Based on differences in acidity, organic acids and phenols were enriched by pH gradient extraction method from walnut shell pyroligneous acid. Contents of organic acids and phenols were measured by acid–base titration method and Folin colorimetric assay, respectively to assess the effectiveness of t...

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Bibliographic Details
Published in:Journal of analytical and applied pyrolysis 2011, Vol.91 (2), p.338-343
Main Authors: Ma, Xihan, Wei, Qin, Zhang, Shanshan, Shi, Lin, Zhao, Zhong
Format: Article
Language:English
Subjects:
acidity
anti-infective properties
Antimicrobial activity
Antioxidant activity
colorimetry
gas chromatography-mass spectrometry
Organic acid
organic acids and salts
Phenol
phenols
pyrolysis
sodium bicarbonate
sodium hydroxide
titration
Walnut pyroligneous acid
walnuts
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Summary:Based on differences in acidity, organic acids and phenols were enriched by pH gradient extraction method from walnut shell pyroligneous acid. Contents of organic acids and phenols were measured by acid–base titration method and Folin colorimetric assay, respectively to assess the effectiveness of the extraction. In addition, the antimicrobial activity of the organic acids and antioxidant activity of phenols extracted were investigated. Chemical components of the extracts that were from the optimal concentrations of NaHCO 3 and NaOH were measured by GC–MS. The results showed that 5% NaHCO 3 could enrich the highest amount of organic acids, whereas 4% NaOH could enrich the highest amount of phenols. The enriched organic acids exhibited high antimicrobial activity, and the enriched phenols exhibited antioxidant activity under low concentrations, and demonstrated dosage dependency.
ISSN:0165-2370
1873-250X
DOI:10.1016/j.jaap.2011.03.009