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Subcritical water extraction of phytochemicals from Phlomis umbrosa Turcz

Title
Subcritical water extraction of phytochemicals from Phlomis umbrosa Turcz
Authors
Ko M.-J.Lee J.-H.Nam H.-H.Chung M.-S.
Ewha Authors
정명수
SCOPUS Author ID
정명수scopus
Issue Date
2017
Journal Title
Innovative Food Science and Emerging Technologies
ISSN
1466-8564JCR Link
Citation
vol. 42, pp. 1 - 7
Keywords
Antioxidant activityFlavonoidsPhenolicsPhlomis umbrosa TurczShanzhiside methyl esterSubcritical-water extraction
Publisher
Elsevier Ltd
Indexed
SCIE; SCOPUS scopus
Abstract
Subcritical water extraction (SWE) avoids the use of organic solvents when extracting active compounds. The SWE of phytochemicals from Phlomis umbrosa Turcz (PT) and the effect of antioxidant activity were investigated while varying the extraction temperature (from 100 °C to 200 °C) and time (from 5 to 25 min). The maximum yields of total polyphenols (142.02 ± 5.67 mg/g PT, mean ± SD) and flavonoids (33.69 ± 3.01 mg/g PT) were obtained for an extraction temperature and time of 200 °C and 20 min, respectively. The correlation of antioxidant activities in terms of their total phenolics and flavonoids contents suggest that the ABTS[rad]+ assay better reflects the antioxidant contents in SWE from PT than does the DPPH assay for extraction temperatures from 110 °C to 200 °C. At higher temperatures around 200 °C, SWE extracts affect the antioxidant activity due to the presence of not only flavonoids but also nonflavonoid phenolic compounds including prenylated flavonoids. Industrial relevance This study used subcritical water extraction (SWE) for the practical applications of the SWE process that extracts antioxidant compounds from medicinal herb such as Phlomis umbrosa Turcz. SWE is excellent technology to selectively extract bioactive compounds using temperature-dependent dielectric constant properties of water. As the temperature of water is increased, the polarity of water decreases. That's why it is selective extraction. The use of SWE in the present study was associated with high efficiency and antioxidant activities. These results indicate that SWE is an efficient and rapid method for extracting phytochemicals, and a safer product only using purified water. SWE has a potential to develop a commercial process for the extraction of phytochemicals. This method can be easily implemented on an industrial scale. © 2017 Elsevier Ltd
DOI
10.1016/j.ifset.2017.05.009
Appears in Collections:
공과대학 > 식품공학전공 > Journal papers
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