Dr. Rym Mansour

Vitis vinifera L.is a traditional Asian herb widely used for different health problems. In the present research, the ethanolic and the aqueous extracts of Vitis vinifera L. leaves collected from shrub, grown in Tunisia, were prepared and evaluated for the antileishmanial activity against Leishmani ainfantum promastigotes. The inhibitory concentration 50 (IC50) was determined and the results showed that the etahnolic extract is more active than the aqueous one (IC50= 0.108 mg/mL). Microscopic observations showed that the ethanolic extract promoted the destruction of cytoplasmic and nuclear membranes of Leishmani ainfantum promastigotes and altered the overall shape of the cell. In order to explain the difference of antileishmanial activity between ethanolic and aqueous extracts, anthocyanins amount was determined by spectrophotometry. It was found that the ethanolic extract is richer in anthocyanins than the aqueous one which can explain the higher antileishmanial activity of the eth...

Grape pomace, which is a winery waste is studied and experimented to serve as a source of natural dyes that could be utilized in textile dyeing. The present study aims at developing and optimizing an extraction method of natural dye derived from grape pomace in order to dye silk fabrics. The water-acidified ethanol (20–40%) mixture is used mainly for the extraction of anthocyanins at different durations and at different temperatures (20–40 °C) from grape pomace. Effects of these independent variables (percentage of acidified ethanol, temperature, and duration of extraction) and their interactions during the extraction are determined by response surface methodology based on three-level three-factorial Box–Behnken design. Optimized values of percentage of acidified ethanol, temperature, and the duration of extraction for the optimization of monomeric anthocyanins concentration (75 mg L−1) are found as 40%, 32,7 °C, and 38 h, respectively. The extract has been used for silk fabrics dyeing. The effects of some parameters (temperature, pH, and salt addition) on dyeing silk fabrics have been studied and optimized. The use of tannic acid as a natural mordant to improve the dye fastness proprieties has been investigated.

Vitis vinifera L. leaves are known for their application in food, pharmaceutical and cosmetic industries. The objective of this research is the valorization of Vitis vinifera L. leaves aqueous extract in wool dyeing. We have evaluated the fastness properties of dyed wool. The effects of different types of mordants on wool dyeing were studied. Antibacterial effects of Vitis vinifera L. leaves aqueous extracts have been evaluated against the following standard bacteria: Pseudomonas aeruginosa, Enterococcus feacalis, Vibrio alginolyticus, Staphylococcus aureus, Listeria monocytogenes and Escherichia coli. We notice that good antibacterial activities of Vitis vinifera L. extracts could valorize them in textile industry Résumé Les feuilles de Vitis vinifera L. sont connues par leurs applications dans les industries alimentaires, pharmaceutiques et cosmétiques. Nous avons évalué les propriétés tinctoriales d'extraits de feuilles de Vitis vinifera L. tels que la solidité aux lavages, a...

In this work, water-extraction of Vitis Vinifera L. (Black Grenache) leaves and analysis of aqueous extracts for anthocyanins were investigated. Vegetable leaves were cultivated in North of Tunisia at different dates. Anthocyanins were identified as main constituents in these natural dyeing materials using high performance liquid chromatography (HPCL). Dyeability of wool and its fastness properties using Vitis Vinifera L. leaves extract were also determined. Aqueous extract of Vitis Vinifera L. leaves has markedly yielded shades with good fastness properties. Thus, affordability is a point favorable for Vitis Vinifera L. leaves. Effects of dye bath pH and temperature on dyeability and fastness proprieties of wool fabrics by aqueous extract of Vitis Vinifera L. leaves were evaluated. Experimental results showed that fastness properties of dyed fabrics ranged from average to very good. Vitis Vinifera L. leaves extracts showed potential to dyeing wool fibers under highly acidic conditions (pH ≤2). The results obtained here revealed that natural dyes extracted from Vitis Vinifera L. leaves can be cost-effective for dyeing wool fabrics.

Vitis vinifera L.is a traditional Asian herb widely used for different health problems. In the present research, the ethanolic and the aqueous extracts of Vitis vinifera L. leaves collected from shrub, grown in Tunisia, were prepared and evaluated for the antileishmanial activity against Leishmani ainfantum promastigotes. The inhibitory concentration 50 (IC 50 ) was determined and the results showed that the etahnolic extract is more active than the aqueous one (IC 50 = 0.108 mg/mL). Microscopic observations showed that the ethanolic extract promoted the destruction of cytoplasmic and nuclear membranes of Leishmani ainfantum promastigotes and altered the overall shape of the cell. In order to explain the difference of antileishmanial activity between ethanolic and aqueous extracts, anthocyanins amount was determined by spectrophotometry. It was found that the ethanolic extract is richer in anthocyanins than the aqueous one which can explain the higher antileishmanial activity of the...

Dyes derived from natural resources, such as plant, animal, mineral, and microbial, were the only substances available to mankind for the dyeing of textiles until the discovery of the first synthetic dye “mauveine” in 1856 by William Henry Perkin.