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2023
Journal article
Optimization of ultrasound-assisted extraction of flavonoids from Portulaca oleracea L., the extraction kinetics and bioactivity of the extract.
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2022
Journal article
Does oxygen affect ageing mechanisms of Pinus densiflora seeds? A matter of cytoplasmic physical state.
During desiccation, the cytoplasm of orthodox seeds solidifies into an intracellular glass with highly restricted diffusion and molecular mobility. Temperature and water content govern seed ageing rates, while oxygen (O2) can promote deteriorative reactions. However, whether the cytoplasmic physical state affects involvement of O2 in seed ageing remains unresolved. We... -
2021
Journal article
Protection of hair from damage induced by ultraviolet irradiation using tea (Camellia sinensis) extracts.
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2021
Journal article
Antioxidant, Anti-Collagenase, Anti-Elastase and Anti-Tyrosinase Activities of an Aqueous Cosmos caudatus Kunth (Asteraceae) Leaf Extract.
Cosmos caudatus Kunth (Asteraceae) or wild cosmos is traditionally used as a culinary and medicinal herb. The leaves and shoots of the plant are reputed to promote a younger skin complexion if consumed regularly. However, research to support its potential use as a cosmeceutical is lacking. This study investigated the...Zakaria, N.N. Azwanida ; Okello, E. Jonathan ; Howes, Melanie-Jayne
Anti-Tyrosinase, Anti-Elastase, Cosmos caudatus, Anti-Collagenase, and Antioxidant
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2019
Journal article
Characterization of secondary metabolites from the berries of Ziziphus mucronata and their antioxidant properties
Ziziphus mucronata is a medicinal plant used traditionally for treating various diseases. The antioxidant assay for the crude extracts obtained from the berries of Ziziphus mucronata was carried out using DPPH (2,2-diphenyl-1-picrylhydrazyl) method. Purified antioxidant compounds were obtained by chromatographic methods and were subjected to structure elucidation using nuclear magnetic...Parkar, Fasahat ; Njue, Alice Wanjiku ; Langat, Moses Kiprotich ; Omolo, Josiah Ouma