Topical delivery of retinyl ascorbate co-drug - 2. Comparative skin tissue and keratin binding studies

Abdulmajed, K., Heard, Charles Martin ORCID: https://orcid.org/0000-0001-9703-9777, McGuigan, Christopher ORCID: https://orcid.org/0000-0001-8409-710X and Pugh, William John 2004. Topical delivery of retinyl ascorbate co-drug - 2. Comparative skin tissue and keratin binding studies. Skin Pharmacology and Physiology 17 (6) , pp. 274-282. 10.1159/000081112

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Abstract

Retinyl ascorbate (RA-AsA), an ester co-drug of vitamins A (RA) and C (AsA), is proposed as a topical antioxidant/cell division regulator for reducing UV-induced generation of free radicals and disrupted dermal cell growth. The efficacy of dermatological agents is influenced by their retention within the skin, which is increased by the interaction with skin components. Keratin is the major protein (approximately 95%) in the skin, and this paper reports the binding of RA-AsA, RA, AsA, retinol, ascorbic acid palmitate and retinol palmitate to three tissues-human callus, pig ear skin and bovine horn keratin. Tissue samples were incubated with solutions of compounds and the uptake measured as the ratio of bound/free compound at equilibrium. Binding to keratin was assessed using delipidised tissue, and was much higher for the polar compounds, suggesting dipolar/H-bonding interaction. Binding strength was ranked as human > porcine > bovine, but there was no distinction for highly lipophilic compounds. The binding characteristic of native tissues was complicated by lipid content of the tissues. There seemed to be a dual effect. The binding of very lipophilic materials increased with lipid content, implying that a substantial amount is dissolved in the lipid matrix. For highly polar AsA, lipid content decreased the binding, suggesting that the lipid reduced the strong polar interactions with skin protein/keratin.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Pharmacy Systems Immunity Research Institute (SIURI)
Subjects:	R Medicine > RS Pharmacy and materia medica
Publisher:	Karger
ISSN:	1660-5527
Date of Acceptance:	24 July 2004
Last Modified:	27 Oct 2022 09:43
URI:	https://orca.cardiff.ac.uk/id/eprint/67490

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