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Advisor(s)
Abstract(s)
Humulus lupulus L. is use as a flavoring and stabilizing agent for beer, giving
aromas and flavors. Can also be use in cosmetics,for its antibacterial/antioxidant effect.
Prepare a cosmetic gel formulations with phenolic extracts of the flowers and vegetative
parts and analyze their stability, antioxidant/antimicrobial activity. Phenolic compounds
were extracted with ethanol/water. Humulus lupulus varieties used were (vegetative
parts):Chinook, Cascade, Polaris, Centennial, Nugget, and (flowers):Cascade, Polaris,
Nugget and Centennial. Gel formulations were prepared, using Carbopol and MethylCellulose, with 3 concentrations: 2.5, 5 and 7.5%. For stability we test:pH, density,
temperature, light, centrifuge, vibration and UV spectrophotometric analysis.
Organoleptic characteristics:odor, color and aspect was test. Extracts were evaluated for
antimicrobial activity by agar diffusion assays of E.coli and Candida albicans. pH have
no alteration. Centrifuge and vibration tests, most of the gel formulations did not present
phase separation. Density was 1.2-1.3 g/cm3
. Candida Albicans test, have no result but
bacteria test shown that E.coli was sensible for all concentrations. Flower hydroalcoolic
extract are richest in phenolic compounds than the vegetative parts. Phenols composition
is different in all varieties. Gels are stable and can be used as a cosmetic in further studies.
Humulus lupulus showed positive antibacterial result.
Description
Keywords
Humulus lupulus Phenols Cosmetic gel Microbiological activity
Citation
Magalhães, Cátia; Spafiu, Paula Raluca; Tălău, Diana Floriana; Pereira, Olívia R.; Sousa, M. João (2019). Bioactivity and chemical composition of humulus lupulus for cosmetic use. In Livro de resumos do III Congresso Nacional das Escolas Superiores Agrárias. Viseu