Essay Samples on Chemistry

Classification And Antioxidant Activity Of Polyphenols

Polyphenols are a group of natural compounds with phenolic structural features (C. Rice-Evans, Miller, & Paganga, 1997; C. A. Rice-Evans, Miller, & Paganga, 1996; Tripoli et al. , 2005; Tsao, 2010; Zheng & Wang, 2001) with two or more hydroxyl groups on the aromatic ring(s)…

Comparative Toxicity Of Selected Pesticides

Abstract: The present experiments were carried out to determined contact toxicity of various biological and chemical pesticides on the first, second instar nymph and adult of Opuntia cochineal scale, Dactylopius opuntiae, and the predator Cryptolaemus montrouzieri Mulsant under field conditions. The results indicated that the…

Types, Properties And Activities Of Antioxidants

An antioxidant is a substance that when present at relatively low concentration(s), compared with those of the oxidisable substrate, significantly delays or inhibits oxidation of that substrate (Apak et al. , 2013) Antioxidants are divided into two classes; primary (or chain breaking) antioxidants and secondary…

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