Measurement of total phenolic content and antioxidant activity of aerial parts of medicinal plant Coronopus didymus

OBJECTIVE@#To evaluate the total phenolic content and compare the antioxidant activity of various solvent extracts and fractions from the aerial parts of Coronopus didymus through various assays.@*METHODS@#Total phenolic content was determined using the Folin-Ciocalteu assay and the in vitro antioxidant activity of a number of different extracts was investigated in a dose-dependent manner with three different methods: the 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) and ferric reducing antioxidant power (FRAP) assays. A flavone was isolated from the most active ethanolic extract with high antioxidant activity using size exclusion chromatography. IC values were calculated for the DPPH and ABTS methods. The FRAP activity was assessed in terms of μM Fe (II) equivalent.@*RESULTS@#The phenolic content was found to be highest in the ethanol extract (CDA Et; 47.8 mM GAE) and the lowest in the dichloromethane extract (CDA DCM; 3.13 mM GAE). The ethanol extract showed high radical scavenging activity towards DPPH and ABTS radicals with IC values of (7.80 × 10) and (4.32 × 10) μg/mL, respectively. The most active ethanol extract had a FRAP value of 1921.7 μM Fe (II) equivalent. The isolated flavone F10C (5,7,4'-trihydroxy-3'-methoxy flavone) was far more effective for scavenging free radicals in the DPPH and ABTS assays with IC of 43.8 and 0.08 μg/mL, than the standard trolox, with IC values of 97.5 and 21.1 μg/mL, respectively. In addition, the flavone F10C and the standard ascorbic acid had FRAP values of 1621.7 and 16 038.0 μM Fe (II) equivalents, respectively.@*CONCLUSIONS@#The total phenolic content of extracts in decreasing order is ethanol extract (CDA Et) > acetone extract (CDA ACE) > phenolic extract (CDA MW) > n-hexane extract (CDA nHX)> chloroform extract (CDA CHL) > dichloromethane extract (CDA DCM). The ordering of extracts in terms of antioxidant activity from highest to lowest is CDA Et > CDA MW > CDA DCM > CDA CHL > CDA ACE > CDA nHX in DPPH, ABTS and FRAP assays. A significant relationship is found between antioxidant potential and total phenolic content, suggesting that phenolic compounds are the major contributors to the antioxidant activity of C. didymus.

Measurement of total phenolic content and antioxidant activity of aerial parts of medicinal plant Coronopus didymus

Objective To evaluate the total phenolic content and compare the antioxidant activity of various solvent extracts and fractions from the aerial parts of Coronopus didymus through various assays. Methods Total phenolic content was determined using the Folin-Ciocalteu assay and the in vitro antioxidant activity of a number of different extracts was investigated in a dose-dependent manner with three different methods: the 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) and ferric reducing antioxidant power (FRAP) assays. A flavone was isolated from the most active ethanolic extract with high antioxidant activity using size exclusion chromatography. IC

An updated review on pharmacological activities and phytochemical constituents of evening primrose (genus Oenothera)

Genus Oenothera includes medicinal plants that are distributed throughout the world and are known since ancient times. Popular indications of different species of this genus include treatment of inflammations, diabetes, microbial infections, ulcers, tumors, kidney and liver problems. The plants of this genus are a botanical source for various pharmaceutically active components like sterols, alkaloids, phenolic acids, flavonoids, triterpenoids, saponins, biflavonols and tocopherols. This review article is a compilation of chemical composition and biological activities of the various species of the genus Oenothera.

Phytochemical analysis of Hibiscus caesius using high performance liquid chromatography coupled with mass spectrometry

Various species in genus Hibiscus are traditionally known for their therapeutic attributes. The present study focused on the phytochemical analysis of a rather unexplored species Hibiscus caesius [H. caesius], using high-pressure liquid chromatography coupled with mass spectrometry [HPLC-MS]. The analysis revealed five major compounds in the aqueous extract, viz. vanillic acid, protocatechoic acid, quercetin, quercetin glucoside and apigenin, being reported for the first time in H. caesius. Literature suggests that these compounds have important pharmacological traits such as anti-cancer, anti-inflammatory, anti-bacterial and hepatoprotective etc. however, this requires further pharmacological investigations at in vitro and in vivo scale. The above study concluded the medicinal potential of H. caesius

Synthesis, Spectral investigation [[1]H, [13]C] and Anti-microbial Screening of benzophenone imines

New series of benzophenone imines with general formula Ph[2]-C=NR; R = Benzyl, 4-Fluorobenzyl, Naphthyl, Phenyl, 4-Nitrophenyl were synthesized by condensation of dichlorodiphenylmethane and different aromatic primary amines [1:1] Those imines were characterized by different physiochemical and spectroscopic techniques like melting point, elemental analysis, FT-IR, multinuclear NMR [[1]H, [13]C]. After characterization, imines were subjected to antimicrobial activities. All compounds showed promising activity against different bacterial strains like Escherichia coli, Bacillussubtilis, Pasturellam ultocida and Staphylococcus aureus as well as fungal strains like Alternata alternaria, Ganoderma lucidium, Penicillium notatum and Trichoderma harzianum using Amoxicillin and Flucanazole as a standard drugs respectively

Outcome of primary percutaneous coronary intervention [PCI] of ostial versus nonostial occlusion of left anterior descending artery [Study conducted at National Institute of Cardiovascular Diseases, Karachi]

Object: The object of this study was to compare the outcome of primary PCI of ostial versus non ostial occlusion of LAD artery

Materials and Methods: This observational study was conducted at National Institute of Cardivascular Diseases Karachi, Pakistan from January 1[st], 2008 to December 31[st], 2008. A total of 70 patients presented to the catheterization laboratory for primary PCI of LAD artery in whom baseline coronary angiogram showed acute occlusion of left anterior descending artery were enrolled for the study. All patients received Aspirin, Clopidogrel and Platelet Glycoprotein IIB IIIA inhibitor. Patients were followed at one month, 3 months and 6 months

Results: Out of 70 cases 50 had nonostial and 20 had ostial occlusion. Baseline characteristics were similar between both groups. Stenting was done in 95% of all patients and was similar in patients with ostial or nonostial narrowing. Procedural success was the same for ostial and nonostial Primary PCI [100% vs. 96%]. Six months event free survival was also similar in both groups [75% vs. 76%]. Total event rate and mortality was also same in both groups [25% vs. 24% and 10% vs. 10%]

Conclusion: Primary PCI of ostial LAD occlusion with suitable anatomy is as safe and similar as non ostial LAD occlusion and optimal results can be achieved in this high risk group of patients in a developing country at a tertiary care public sector hospital. To validate our results further studies with larger cohort are needed

Activity of polyphenolic plant extracts as scavengers of free radicals and inhibitors of xanthine oxidase

The free radical scavenging activity of ethanolic and aqueous extracts from six plants has been evaluated, in vitro, using 1, 1-diphenyl-2-picrylhydrazyl [DPPH] radical scavenging method and compared with ascorbic acid, quercetin. kaempferol and apigenin. Extracts of Pistacia integerrima leaves and galls exhibited highest DPPH radical scavenging activity among all the plants extracts examined. Carissa carandas from Apocynaceae and Vitex negundo of Verbenaceae family also demonstrated DPPH radical scavenging activity. Inhibitory effects towards the in-vitro reaction of hypoxanthine and xanthine oxidase [XO] was also carried out in the presence of plant extract, aglycones quercetin, kaempferol and apigenin along with allopurinol The extracts from Pistacia integerrima galls exhibited highest XO inhibitory activity than leaves of Pistacia integerrima and other plant extracts, was comparable with aglycones but less than allopurniol, a pharmacologically different structure. The increased DPPH radical scavenging and XO inhibitors activity by Pistacia integerrima galls may be partly exerted by flavonoids produced during stress of an insect aphids [Pemphogus species] attack on the leaves. The results indicate that Pistacia integerrima may be a good candidate for future studies in vivo models of gout and hyperuricemia