The aim of the present study was to determine the antioxidant activity of Coreopsis tinctoria flowering tops (CTFT). Studies were conducted to obtain suitable extraction conditions for chlorogenic acid, quercetin, luteolin, apigenin and kaempferol, which were identified and quantified by HPLC. Response surface methodology was employed to optimise the ultrasound-assisted extraction conditions in...

There is a great variation in the chemical composition of propolis of different origins. Likewise, the method of its extraction has significant impact on the content of biologically active compounds. Here we compared methods of propolis extraction for optimal antioxidant activities which were measured by means of beta-carotene discolouration, 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical sc...

BACKGROUND Protein tyrosine phosphatase expressed in insulin-sensitive tissues (such as liver, muscle, and adipose tissue) has a key role in the regulation of insulin signaling and pathway activation, making protein tyrosine phosphatase a promising target for the treatment of type 2 diabetes mellitus and obesity and response surface methodology (RSM) is an effective statistical technique for op...

The objective of our work was the valorisation four aromatic plants growing spontaneously in Kabylia (Algeria) by evaluation their insecticidal activity against black bean aphid Aphis fabae Scopoli, 1763. These are oregano, thyme, rosemary and lavender. were subjected to a phytochemical analysis determine secondary metabolites composition. results obtained showed that extracts toxic A. can sign...

The purpose of the research was to develop and validate a rapid quantification method able to screen many samples of yam bean seeds to determine the content of two toxic polyphenols, namely pachyrrhizine and rotenone. The analytical procedure described is based on the use of an internal standard (dihydrorotenone) and is divided in three steps: microwave assisted extraction, purification by soli...

Cotinus coggygria is a deciduous shrub of the family Anacardiaceae, widespread in Southern Europe, the Balkans, and Southwestern and Central Asia. Extracts from the leaves, twigs, wood, and inflorescences of the plant are used in the ethnomedicine of Eastern and Southeastern Europe and China as antidiarrhoetic, anti-inflammatory and anti-paradentosis1–3. It has been proven to contain a high amo...