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Article Publish Status: FREE
Abstract Title:

In Vitro Antioxidant and Prooxidant Activities of Red Raspberry (L.) Stem Extracts.

Abstract Source:

Molecules. 2022 Jun 24 ;27(13). Epub 2022 Jun 24. PMID: 35807315

Abstract Author(s):

Rasa Garjonyte, Jurga Budiene, Linas Labanauskas, Asta Judzentiene

Article Affiliation:

Rasa Garjonyte

Abstract:

Leaves and stems of red raspberry () are used in Lithuanian folk medicine. Healing properties of raspberry are related to the content of bioactive compounds, mainly polyphenols. Extracts of raspberry leaves contained higher total phenolic content (TPC) (1290 mg/L, expressed in gallic acid equivalent) compared to that in extracts of stems or peeled bark (up to 420 mg/L and 598 mg/L, respectively). To find out whether the collection time of herbal material was critical for the properties of the extracts, the stems were collected at different times of the year. TPC in the extracts depended more on extraction conditions rather than on the sampling time. Antioxidant activity of raspberry stem and bark extracts tested by spectrophotometric (DPPHscavenging) and electrochemical (cyclic and differential pulse voltammetry) assays correlated with TPC. DPPH radical scavenging activity values for stem, leaf, and bark extracts were as follows:≤1.18 ± 0.07, 1.63 ± 0.10, and ≤1.90 ± 0.04 (mmol/L, TROLOX equivalent), respectively. Assessed electrochemically, hydrogen peroxide-scavenging activity of extracts was independent on TPC. The latter activity was related to the presence of some protein in the extract as revealed by gel electrophoresis. Prooxidant activity of raspberry stem extracts was dependent on solution pH and temperature.

Study Type : In Vitro Study

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