{Reference Type}: Journal Article
{Author}: Zouari, Sami; Ketata, Mouna; Boudhrioua, Nourhene; Ammar, Emna
{Year}: 2013
{Title}: Allium roseum L. volatile compounds profile and antioxydant activity for chemotype discrimination – Case study of the wild plant of Sfax (Tunisia)
{URL}: http://www.sciencedirect.com/science/article/pii/S0926669012002105
{Tag}: 0
{Star}: 0
{Journal}: Industrial Crops and Products
{Volume}: 41
{Issue}: 0
{Pages}: 172-178
{Date Displayed}: 2013/1//
{Alternate Title}: Industrial Crops and Products
{ISBN/ISSN}: 0926-6690
{Keywords}: Allium roseum; Essential oil; Chemical composition; Farnesol; Antioxidant activity
{Abstract}: This study deals with the chemical composition and antioxidant activities of Allium roseum L. a chemotype growing wild in Tunisia, to evidence new bioactive natural compounds in its flower essential oil, and to investigate possible antioxidative methanolic leaves extract properties. This essential oil was extracted by hydrodistillation and analyzed by GC and GC/MS. The main compounds were butylated hydroxytoluene, eugenol, farnesol, dimethyl trisulfide, methyl 2-propenyl trisulfide, Z-9-octadecenoic acid and tricosane found at respectively 10.0%, 8.4%, 6.9%, 6.1%, 5.3%, 5.2% and 4.8%. Moreover, 1-oxa-4,6-diazacyclooctane-5-thione (3.9%) was isolated for the first time in the Tunisian A. roseum, especially in the country central area (Sfax City). The methanolic leaves extract had antioxidant activities, assessed by two complementary tests: the DPPH radical-scavenging and the reducing power essays, when compared with those of butylated hydroxy anisole and ascorbic acid. These antioxidant activities and the essential oil profile would be a fingerprint for chemotype discrimination.

{Reference Type}: Journal Article
{Author}: Liu, Jun; Jia, Liang; Kan, Juan; Jin, Chang-hai
{Year}: 2013
{Title}: In vitro and in vivo antioxidant activity of ethanolic extract of white button mushroom (Agaricus bisporus)
{URL}: http://www.sciencedirect.com/science/article/pii/S027869151200751X
{Tag}: 0
{Star}: 0
{Journal}: Food and Chemical Toxicology
{Volume}: 51
{Issue}: 0
{Pages}: 310-316
{Date Displayed}: 2013/1//
{Alternate Title}: Food and Chemical Toxicology
{ISBN/ISSN}: 0278-6915
{Keywords}: Agaricus bisporus; Antioxidant activity; Ethanolic extract; In vitro; In vivo; Phenolic compounds
{Abstract}: The antioxidant activities of ethanolic extract from edible mushroom Agaricus bisporus (A. bisporus) were evaluated by various methods in vitro and in vivo. In antioxidant assays in vitro, ethanolic extract of A. bisporus was found to have strong reducing power, superoxide radical, hydroxyl radical and 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity, and moderate hydrogen peroxide scavenging activity. In antioxidant assays in vivo, mice were administered with ethanolic extract of A. bisporus via gavage for 30 consecutive days. As a result, administration of ethanolic extract significantly enhanced the activities of antioxidant enzymes in serums, livers and hearts of mice. In addition, the total phenolic content in the extract determined by Folin–Ciocalteu method was 6.18 mg of gallic acid equivalents per gram of dry weight. The main phenolic compounds in ethanolic extract analyzed by ultra-high performance liquid chromatography tandem mass spectrometry were determined as gallic acid, protocatechuic acid, catechin, caffeic acid, ferulic acid and myricetin. These results suggested that ethanolic extract of A. bisporus had potent antioxidant activity and could be explored as a novel natural antioxidant.

{Reference Type}: Journal Article
{Author}: Yu, Xiangying; Zhao, Mingyue; Liu, Fei; Zeng, Shitong; Hu, Jun
{Year}: 2013
{Title}: Identification of 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one as a strong antioxidant in glucose–histidine Maillard reaction products
{URL}: http://www.sciencedirect.com/science/article/pii/S0963996913000045
{Tag}: 0
{Star}: 0
{Journal}: Food Research International
{Volume}: 51
{Issue}: 1
{Pages}: 397-403
{Date Displayed}: 2013/4//
{Alternate Title}: Food Research International
{ISBN/ISSN}: 0963-9969
{Keywords}: Maillard reaction; Antioxidant activity; HPLC analysis; Gel filtration chromatography; 2,3-Dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP)
{Abstract}: Abstract
The antioxidant activity of glucose–histidine MRPs (GH) and fractionated GH, obtained from the elution of GH on Bio-gel P-2 column, was evaluated for their DPPH radical scavenging activity, ABTS radical scavenging activity and reducing power, which illustrated that fraction H7 was of the greatest antioxidant activity. The further investigation identified 2,3-dihydro-3,5-dihydroxy-6-methyl-4H-pyran-4-one (DDMP) as the major compound in fraction H7 by employing GC–MS analysis and HPLC analysis, with the latter also confirming the antioxidant activity of DDMP by comparison of HPLC chromatograms of fraction H7 (or DDMP) before and after reaction with DPPH radical, ABTS radical or ferric ion. Finally, the comparison of the antioxidant activity of DDMP, fraction H7 and GH by UV–vis analysis showed their antioxidant activity was in the following order: DDMP > fraction H7 > GH, suggesting that the major contribution of DDMP to the antioxidant activity of fraction H7, thus, DDMP could be identified as a strong antioxidant in GH considering that fraction H7 was of the greatest antioxidant activity among all fractions obtained from the separation of GH by gel filtration chromatography.

{Reference Type}: Journal Article
{Author}: Wu, Jiulin; Chen, Shanfei; Ge, Shangying; Miao, Jing; Li, Jianhua; Zhang, Qiqing
{Year}: 2013
{Title}: Preparation, properties and antioxidant activity of an active film from silver carp (Hypophthalmichthys molitrix) skin gelatin incorporated with green tea extract
{URL}: http://www.sciencedirect.com/science/article/pii/S0268005X12002949
{Tag}: 0
{Star}: 0
{Journal}: Food Hydrocolloids
{Volume}: 32
{Issue}: 1
{Pages}: 42-51
{Date Displayed}: 2013/7//
{Alternate Title}: Food Hydrocolloids
{ISBN/ISSN}: 0268-005X
{Keywords}: Active film; Green tea extract; Physical properties; Antioxidant activity; Silver carp skin gelatin
{Abstract}: An active film from silver carp skin gelatin incorporated with green tea extract (GTE) was developed. The effects of GTE concentrations including 0.3 and 0.7% (w/v) on the film properties were determined by measuring total polyphenolic content, antioxidant activity and physical properties. The findings of this study showed that the incorporation of GTE into gelatin films enhanced the total phenolic content, DPPH radical scavenging activity and reducing power. However, DPPH radical scavenging activity and reducing power decreased during storage. As regards the physical properties, higher GTE content incorporated into gelatin films revealed significantly higher tensile strength and lower elongation at break, water solubility and water vapor permeability, but no difference in thickness. Gelatin–GTE films exhibited lower light transmission in UV light, lower percent transmittance and higher transparency value compared to control film. Moreover, protein patterns of gelatin–GTE films had no changes. The thermal stability of gelatin–GTE films was improved and grew with the increasing concentration of GTE. FTIR spectra indicated that protein–polyphenol interactions were involved in the gelatin–GTE films. Smooth and homogeneous surface and compact-structure were observed in gelatin–GTE films. Thus, the addition of GTE into gelatin film improved the antioxidant activity and directly affected the properties most likely due to the interactions between gelatin and GTE.