benzophenone

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benzophenone

(bĕn′zō-fĭ-nōn′, -fē′nōn)
n.
A white crystalline aromatic compound, C13H10O, used in perfumery and in medicine. Also called diphenylketone.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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Generally, this kind of plants contains polyprenilated benzophenones in roots, leaves, and fruits (de Castro Ishida et al.
Benzophenones. Benzophenone compounds possess the same A ring structure, which easily loses 94 Da (A ring) and 44 Da (C[O.sub.2]) in the negative ion mode.
Previous investigation on the isolation of phytochemicals from its leaves, pericarp and twigs yielded xanthones, benzophenones flavonoids, biflavonoids and triterpenes showing antioxidant, antimicrobial, cytotoxic and anticholinesterase activeties [5, 16-20].
Peaks were identified by comparison of their retention times (Rt) (1 = 8.0 min; 2 = 6.2 min; 3 = 8.2 min; 4 = 11.5 min; 5 = 19.4 min; 6 = 8.8 min; 7 = 5.7 min; 8 = 7.3 min) and co-injection with authentic standards isolated from Hypericum species (benzophenones 1 and 2 from H.
Warshaw, chief of dermatology at the Minneapolis Veterans Affairs Medical Center, said that benzophenones were chosen as Allergen of the Year "to raise awareness that they are becoming more of a common allergen, and [to recommend] that they should be on a standard screening series, because they're in so many products like sunscreen, shampoo, conditioner, perfumes, and hand sanitizers.
The bulky benzophenone group has no steric hindrance effect on the reactivity of BPMA, which based on the fact that benzophenone group is far away from the active center methacryloxy.
Like benzophenones, phenols, and parabens, DCB has been reported to have both in vitro EDC activity and EDC effects in laboratory animals [Darbre and Harvey 2008; Fang et al.
The ultraviolet filter benzophenone 2 interferes with the thyroid hormone axis in rats and is a potent in vitro inhibitor of human recombinant thyroid peroxidase.
They found that four sunscreen chemicals--parabens, cinnamates, benzophenones and a camphor derivative--cause the viruses to replicate until their algae hosts explode, spilling virus particles into the surrounding seawater, where they can infect neighbouring coral communities.
* Benzophenones (oxybenzone absorbs UVB and UVA2), anthranilates, avobenzone and Bisethylhexyloxy phenol methoxy phenyl triazene (which gives photo stability to avobenzone) are UVA blockers3.
MAFF is due to issue shortly the results of a large survey on migration of benzophenones, used as initiators in UV cured inks, into packaged foods, But here it is considered to be lagging behind moves away from the use of benzophenones, at least in the inks sector.
PABA generated oxygen radicals most readily, whereas benzophenones, such as oxybenzone, and salicylates appeared to produce none.