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Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods

Aqueous and ethanol extracts of oven and freeze-dried Streblus asper leaves were investigated using DPPH assay. The presence of phenolic compounds and flavonoids in the extracts, which were detected by Folin and colorimetric assays, respectively, may be responsible for the antioxidant activities of...

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Autores principales: Ibrahim, Nor Mawarti, Mat, Ishak, Lim, Vuanghao, Ahmad, Ruzita
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4665435/
https://www.ncbi.nlm.nih.gov/pubmed/26784343
http://dx.doi.org/10.3390/antiox2030156
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author Ibrahim, Nor Mawarti
Mat, Ishak
Lim, Vuanghao
Ahmad, Ruzita
author_facet Ibrahim, Nor Mawarti
Mat, Ishak
Lim, Vuanghao
Ahmad, Ruzita
author_sort Ibrahim, Nor Mawarti
collection PubMed
description Aqueous and ethanol extracts of oven and freeze-dried Streblus asper leaves were investigated using DPPH assay. The presence of phenolic compounds and flavonoids in the extracts, which were detected by Folin and colorimetric assays, respectively, may be responsible for the antioxidant activities of S. asper. The different drying treatments resulted in significant differences (p < 0.05) in the antioxidant properties as well as the phenolic and flavonoid contents of the S. asper extracts. Freeze-dried S. asper leaf extracts exhibited high DPPH radical scavenging activity ranging from 69.48% ± 0.03% to 89.25% ± 0.01% at concentrations ranging from 0 to 1 mg/mL, significantly higher compared with the oven-dried extracts which were in the range of 68.56% ± 0.01% to 86.68% ± 0.01%. Generally, the 70% ethanol extract of the freeze-dried samples exhibited higher phenolic and flavonoid content than the aqueous extract, with values of 302.85 ± 0.03 mg GAE/g and 22.70 ± 0.02 mg QE/g compared with 226.8 ± 0.03 mg GAE/g and 15.38 ± 0.05 mg QE/g, respectively. This study showed that S. asper leaf extracts contain a number of health promoting bioactive compounds, such as phenolic compounds, and are potential sources of natural antioxidants.
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spelling pubmed-46654352016-01-14 Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods Ibrahim, Nor Mawarti Mat, Ishak Lim, Vuanghao Ahmad, Ruzita Antioxidants (Basel) Communication Aqueous and ethanol extracts of oven and freeze-dried Streblus asper leaves were investigated using DPPH assay. The presence of phenolic compounds and flavonoids in the extracts, which were detected by Folin and colorimetric assays, respectively, may be responsible for the antioxidant activities of S. asper. The different drying treatments resulted in significant differences (p < 0.05) in the antioxidant properties as well as the phenolic and flavonoid contents of the S. asper extracts. Freeze-dried S. asper leaf extracts exhibited high DPPH radical scavenging activity ranging from 69.48% ± 0.03% to 89.25% ± 0.01% at concentrations ranging from 0 to 1 mg/mL, significantly higher compared with the oven-dried extracts which were in the range of 68.56% ± 0.01% to 86.68% ± 0.01%. Generally, the 70% ethanol extract of the freeze-dried samples exhibited higher phenolic and flavonoid content than the aqueous extract, with values of 302.85 ± 0.03 mg GAE/g and 22.70 ± 0.02 mg QE/g compared with 226.8 ± 0.03 mg GAE/g and 15.38 ± 0.05 mg QE/g, respectively. This study showed that S. asper leaf extracts contain a number of health promoting bioactive compounds, such as phenolic compounds, and are potential sources of natural antioxidants. MDPI 2013-08-30 /pmc/articles/PMC4665435/ /pubmed/26784343 http://dx.doi.org/10.3390/antiox2030156 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Communication
Ibrahim, Nor Mawarti
Mat, Ishak
Lim, Vuanghao
Ahmad, Ruzita
Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title_full Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title_fullStr Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title_full_unstemmed Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title_short Antioxidant Activity and Phenolic Content of Streblus asper Leaves from Various Drying Methods
title_sort antioxidant activity and phenolic content of streblus asper leaves from various drying methods
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4665435/
https://www.ncbi.nlm.nih.gov/pubmed/26784343
http://dx.doi.org/10.3390/antiox2030156
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AT ahmadruzita antioxidantactivityandphenoliccontentofstreblusasperleavesfromvariousdryingmethods