Identification and quantification of fruit phenolic compounds of Malus communis

Malus communis (apple) is fruits belong to family Rosaseae. Apple is important source of phytochemicals substance, which has good effect in human health and antioxidant activity. The aim of this work is to identify the polyphenols compounds and the antioxidant activity of Malus communis. The analyses phytochemicals of polyphenols is estimated by UPLC method. The flavonoids content were determinate by the Aluminum chloride method.  The antioxidant activity was evaluated by the DPPH, ABTS and reducing power. The results suggested that Malus communis have high content of sugars, tannin (795  ± 0.05 mg D- glucose equivalents per gram dry weight, 31.38 ± 0.006 mg tannic acid equivalents per gram dry weight and important amount of flavonoids 5.08 ±  0.001 mg quercetin equivalents per gram of dry weight) respectively. The chromatogram of apple demonstrated that this fruits contain various substances such as Gallic acid and Chlorogenic acid. The extract exerted good effect in antioxidant activity. Apple can scavenge free radicals ABTS and DPPH with values of IC50 (0.64 ± 0.02, 0.60 ± 0.03 mg/ml respectively). Finally the consumption dietary of fruits can reduce the risk the chronic disease.    Keywords: Malus communis, UPLC, tannin, flavonoids, antioxidant activity

Modélisation des modifications d'indice de TiO2 en présence d'inclusions métalliques d'argent

National audienc

Refractive Index of Dielectric with Metal Nanoparticles

International audienc

Mie theory applications to study response of metallic nanospheres in a nanocomposite medium

International audienc

Phenolic compounds of Pyrus communis fruit methanol extract and evaluation of antioxidant activity

Pear (Pyrus communis.) fruit is popular among consumers due to its high nutritive value, good taste and low caloric level. This study examined polyphenolic content, antioxidant activity and phenolic profile of methanol extract of Pyrus communis fruit. Extract were screened for possible antioxidant activities using free radical scavenging activity of DPPH, hydroxyl scavenging activity and reducing power assays. This extract contain high polyphenolic and flavonoids contents (172.5 ± 0.005 mg GAE/g dry extract and 5.34 ± 0.003mg QE/g dry extract) respectively. Similarly, this extract showed high antioxidant activity using DPPH, hydroxyl radical scavenging and reducing power with an IC50 value of 0.682 ± 0.022 mg/ml, 0.47 ± 0.06 mg/ml and 1.17 ± 0.029 mg/ml respectively. The phenolic profile in the methanolic extracts was investigated using Ultra high liquid chromatography (UPLC). Four different phenolic acids gallic acid, chlorogenic acid, hydroxybenzoic acid and protocatechuic acid have been identified. Some flavonoids have also been identified such as rutin and kaempherol derivative. In conclusion, the present study showed that Pyrus communis exhibited good antioxidant activity which is probably related to phenolics and flavonoids present in the extract. Keywords: Pyrus communis, phenolic compounds, flavonoids, antioxidant activity

Extraction of the 3D plasmon field

International audienc

Optical properties of dielectric media in the presence of metallic nanoparticles

4 pagesInternational audienc

Modélisation des modifications d'indice de TiO2 en présence d'inclusions métalliques d'argent

3 pagesNational audienc

Dependence of optical properties of SiO2 matrix on the metallic negative index

2 pagesInternational audienc

Distribution du champ du plasmon d'une nanosphère d'argent enterrée dans une matrice de silice

3 pagesNational audienc