Total Phenolic, Phenolic Acid, Anthocyanin, Flavan-3-ol, and Flavonol Profiles and Antioxidant Properties of Pinto and Black Beans (Phaseolus vulgaris L.) as Affected by Thermal Processing

The effects of boiling and steaming processes at atmospheric and high pressures on the phenolic components and antioxidant properties of pinto and black beans were investigated. In comparison to the original raw beans, all processing methods caused significant (p < 0.05) decreases in total phenol...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2009-06, Vol.57 (11), p.4754-4764
Main Authors: Xu, Baojun, Chang, Sam K. C
Format: Article
Language:English
Subjects:
anthocyanins
antioxidant activity
Biological and medical sciences
black beans
boiling
Chemical Changes Induced by Processing/Storage
flavanols
flavonoids
flavonols
Food industries
free radical scavengers
free radicals
Fruit and vegetable industries
Fundamental and applied biological sciences. Psychology
heat treatment
high performance liquid chromatography
phenolic acids
phenolic compounds
pinto beans
proanthocyanidins
steaming
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Summary:The effects of boiling and steaming processes at atmospheric and high pressures on the phenolic components and antioxidant properties of pinto and black beans were investigated. In comparison to the original raw beans, all processing methods caused significant (p < 0.05) decreases in total phenolic content (TPC), total flavonoid content (TFC), condensed tannin content (CTC), monomeric anthocyanin content (MAC), DPPH free-radical scavenging activity (DPPH), ferric-reducing antioxidant power (FRAP), and oxygen radical absorbing capacity (ORAC) values in both pinto and black beans. Steaming processing resulted in a greater retention of TPC, DPPH, FRAP, and ORAC values than the boiling processes in both pinto and black beans. To further investigate how thermal processing affected phenolic compositions and to elucidate the contribution of individual phenolic compounds to antioxidant properties, phenolic acids, anthocyanins, flavan-3-ols, and flavonols were quantitatively analyzed by high-performance liquid chromatography (HPLC). All thermal processing significantly (p < 0.05) affected individual phenolic acids, anthocyanins, flavan-3-ols, and flavonols, significantly (p < 0.05) reduced total phenolic acid contents in both pinto and black beans and total flavonol contents in pinto beans, and dramatically reduced anthocyanin contents in black beans. Phenolic acids and flavonols may play important roles on the overall antioxidant activities of pinto beans, while anthocyanins, flavan-3-ols, and flavonols may play important roles on the overall antioxidant activities of black beans.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf900695s