Evaluation of the Antioxidant Activity of Syzygium cumini Leaves

Abstract

The antioxidant activity of Syzygium cumini leaf extracts was investigated using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical-scavenging and ferric-reducing antioxidant power (FRAP) assays. The methanolic extract and its four water, ethyl acetate, chloroform, and n-hexane fractions were prepared and subjected to antioxidant evaluation. The results showed that the ethyl acetate fraction had stronger antioxidant activity than the other ones. HPLC data indicated that S. cumini leaf extracts contained phenolic compounds, such as ferulic acid and catechin, responsible for their antioxidant activity. A significant linear relationship between antioxidant potency, free radical-scavenging ability and the content of phenolic compounds of leaf extracts supported this observation.

Enzymatic Improvement in the Polyphenol Extractability and Antioxidant Activity of Green Tea Extracts

“…Several researcher groups have found that pectinase and cellulose enzyme treatment significantly increases extract yield and soluble solid content. 35,36) Our results agree with those of previous studies that show that banana juice, 36) prickly pear juice, 37) and asparagus juice 38) extracted with cellulase or pectinase contain more soluble solids than untreated juice. We have observed that a small improvement in green tea extraction is achieved because catechins inhibit enzymes by direct competitive interactions.…”

Influence of different extraction conditions on antioxidant properties of soursop peel

“…Thaipong et al (2006) also reported that the TPC and antioxidant activity of guava extract were highly correlated (r = 0.97) between TPC and FRAP. A very high correlation (r = 0.99) was also demonstrated by another study (Ruan et al, 2008). A moderate correlation (r = 0.56) between TPC and DPPH radical scavenging activity was also found for guava leaf extract (Tachaktitirungrod et al, 2007).…”

Phytochemical Composition and Pleotropic Pharmacological Properties of Jamun, Syzygium Cumini Skeels

“…The ethyl acetate fraction was found to be most potent in scavenging of DPPH radicals and FRAP. 42 The anthocyanin-rich extract prepared in acidified (5% H 3 PO 4 ) ethanol from Jamun fruits was shown to scavenge 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) anion and peroxy radicals efficiently. 31 The 1:1 dichloromethane and methanol (DCM-MET) extract of Jamun leaves was evaluated for its ability to scavenge different free radicals in vitro.…”