Affiliation:
1. Chair and Department of Cosmetic and Pharmaceutical Chemistry , Pomeranian Medical University , Powstańców Wielkopolskich 72, 70-111 Szczecin , Poland
Abstract
Summary
Introduction: Hop (Humulus lupulus L.) is a common plant in Europe, with many beneficial health effects. In addition to the use in brewing, hops are a valuable source of active substances used in conventional and folk medicine, such as humulones and lupulones, as well as antioxidants, including phenolic compounds.
Objective: The aim of the study was to evaluate and compare the antioxidant activity of alcoholic extracts of fresh hop leaves collected in 2017 and 2018.
Material and methods: The raw material consisting of fresh hop leaves was extracted using ultrasound-assisted extraction. Methyl, ethyl and isopropyl alcohol at three concentrations were used as extractants. The antioxidant activity of extracts was determined using DPPH and FRAP methods. Total phenolic content was evaluated using the Folin-Ciocalteu technique.
Results: All the extracts showed antioxidant potential as well as the phenolic content. Regardless of the harvesting year and methods of evaluation, the highest antioxidant activity and the total polyphenol content were observed for extracts prepared in undiluted methanol, obtained during one hour lasting extraction.
Conclusion: The results of the studies have suggested that hop leaves can be a potential source of health-promoting antioxidants.
Reference39 articles.
1. 1. Bocquet L, Sahpaz S, Hilbert JL, Rambaud C, Rivière C. Humulus lupulus L., a very popular beer ingredient and medicinal plant: overview of its phytochemistry, its bioactivity, and its biotechnology. Phytochem Rev 2018; 17(5):1047-1090. doi: http://dx.doi.org/10.1007/s11101-018-9584-y10.1007/s11101-018-9584-y
2. 2. Mielczarek M, Kołodziejczyk J, Olas B. Właściwości lecznicze chmielu zwyczajnego (Humulus lupulus L.). Post Fitoter 2010; 11(4):205-210
3. 3. Nowak G. Surowce roślinne o działaniu przeciwlękowym i antydepresyjnym. Herba Pol 2009; 55(1):84-97.
4. 4. Dobros N. Zioła o działaniu uspokajającym i przeciwdepresyjnym. Post Fitoter 2017; 18(3):215-222. doi: http://dx.doi.org/10.25121/PF.2017.18.3.21510.25121/PF.2017.18.3.215
5. 5. Sbardella M, Racanicci AM., Gois FD, de Lima CB, Migotto DL, Costa LB et al. Effects of dietary hop (Humulus lupulus L.) β-acids on quality attributes, composition and oxidative stability of pork meat. J Sci Food Agric 2018; 98(6):2385-2392. doi: http://dx.doi.org/10.1002/jsfa.873010.1002/jsfa.8730
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