Avobenzone

SIAL/16633 - analytical standard

Synonym: 1-(4-Methoxyphenyl)-3-(4-tert-butylphenyl)-1,3-propanedione; Butyl methoxydibenzoylmethane

CAS Number: 70356-09-1
Empirical Formula (Hill Notation): C₂₀H₂₂O₃
Molecular Weight: 310.39
EC Number: 274-581-6
MDL Number: MFCD00210252
Linear Formula: C₂₀H₂₂O₃
Product Type: Chemical

Catalog Number	PKG Qty.	Price


45-16633-25MG	25 mg	$233.00 1/EA	Add To Favorites

This picture is provided solely for illustration purposes. Optical properties of the actual product may deviate. Relevant product information is printed on labeled products and other accompanying or available information material. This image depicts SKU: 16633-25MG

Properties
Descriptions
Safety Info.
Basic Data

application(s)	cleaning products cosmetics environmental food and beverages personal care
assay	≥99.0% (GC)
format	neat
grade	analytical standard
InChI	1S/C20H22O3/c1-20(2,3)16-9-5-14(6-10-16)18(21)13-19(22)15-7-11-17(23-4)12-8-15/h5-12H,13H2,1-4H3
InChI key	XNEFYCZVKIDDMS-UHFFFAOYSA-N
mp	81-84 °C
Quality Level	100
SMILES string	COc1ccc(cc1)C(=O)CC(=O)c2ccc(cc2)C(C)(C)C
technique(s)	gas chromatography (GC): suitable
	HPLC: suitable

Application:	Avobenzone may be used as an analytical reference standard for the quantification of the analyte in the following: • Sunscreen formulations using reversed-phase high-performance liquid chromatography with diode array detection (RP-HPLC-DAD). • Freshwater, saline water samples, rat plasma and skin layers using liquid chromatography-positive electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) in multiple reaction monitoring mode (MRM). Avobenzone may be used to study the photophysical characteristics, photosensitizing activity of a blocked diketo form derived from 4-tert-butyl-4′-methoxydibenzoylmethane (BM-DBM).
Application:	Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.
General description:	Avobenzone is an UVA filter. It is used in sunscreen lotions and cosmetic formulations. It has maximum absorption at ca 340–350 nm, decreasing under UV irradiation resulting in loss of the UVA protecting effect. Its photostability is very sensitive as it is stable in polar protic solvent and is photolabile in nonpolar solvents.

Hazard statements	H413
Precautionary statements	P273
Hazard Codes	N
Risk Statements	50/53
Safety Statements	60-61
RIDADR	UN 3077 9 / PGIII
WGK Germany	WGK 2

Purity	≥99.0% (GC)
mp	81-84 °C
UNSPSC	41116107

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