Compounds > 1-1-diphenyl-2-picrylhydrazyl

1-1-diphenyl-2-picrylhydrazyl and tartaric-acid

1-1-diphenyl-2-picrylhydrazyl has been researched along with tartaric-acid* in 2 studies

Other Studies

2 other study(ies) available for 1-1-diphenyl-2-picrylhydrazyl and tartaric-acid

Article	Year
Production of starch with antioxidative activity by baking starch with organic acids. Bioscience, biotechnology, and biochemistry, 2011, Volume: 75, Issue:9 A starch ingredient with antioxidative activity, as measured by the DPPH method, was produced by baking corn starch with an organic acid; it has been named ANOX sugar (antioxidative sugar). The baking temperature and time were fixed at 170 °C and 60 min, and the organic acid used was selected from preliminary trials of various kinds of acid. The phytic acid ANOX sugar preparation showed the highest antioxidative activity, but the color of the preparation was almost black; we therefore selected L-tartaric acid which had the second highest antioxidative activity. The antioxidative activity of the L-tartaric acid ANOX sugar preparation was stable against temperature, light, and enzyme treatments (α-amylase and glucoamylase). However, the activity was not stable against variations in water content and pH value. The antioxidative activity of ANOX sugar was stabilized by treating with boiled water or nitrogen gas, or by pH adjustment. Topics: alpha-Amylases; Antioxidants; Biotechnology; Biphenyl Compounds; Drug Stability; Food Additives; Glucan 1,4-alpha-Glucosidase; Hot Temperature; Hydrogen-Ion Concentration; Nitrogen; Phytic Acid; Picrates; Starch; Tartrates; Water	2011
Synthesis and antioxidant properties of pulvinic acids analogues. Bioorganic & medicinal chemistry, 2010, Nov-15, Volume: 18, Issue:22 The synthesis of three types of pulvinic acid analogues, using a diversity-oriented strategy starting from a single compound, dimethyl l-tartrate, is described. Lacey-Dieckmann condensation, alcohol dehydration and Suzuki-Miyaura cross-couplings were employed in the course of the analogues syntheses. The evaluation of the antioxidant properties of the 28 synthesized analogues was carried out using antioxidant capacity assays (protection of thymidine and β-carotene) and free radical scavenging assays (DPPH radical and ABTS radical cation). This allowed to assess the relative influence of the groups bonded to the tetronic ring and to the exocyclic double bond on the activity, as well as the importance of this exocyclic double bond. It was shown that the presence of an electron-donating group on the 3-position of the tetronic ring had a beneficial effect. It was shown in several assays that the presence of the exocyclic bond was not crucial to the activity. Topics: Benzothiazoles; beta Carotene; Biphenyl Compounds; Carboxylic Acids; Free Radical Scavengers; Lactones; Picrates; Sulfonic Acids; Tartrates; Thymidine	2010

Article

Year

Production of starch with antioxidative activity by baking starch with organic acids.

Bioscience, biotechnology, and biochemistry, 2011, Volume: 75, Issue:9

A starch ingredient with antioxidative activity, as measured by the DPPH method, was produced by baking corn starch with an organic acid; it has been named ANOX sugar (antioxidative sugar). The baking temperature and time were fixed at 170 °C and 60 min, and the organic acid used was selected from preliminary trials of various kinds of acid. The phytic acid ANOX sugar preparation showed the highest antioxidative activity, but the color of the preparation was almost black; we therefore selected L-tartaric acid which had the second highest antioxidative activity. The antioxidative activity of the L-tartaric acid ANOX sugar preparation was stable against temperature, light, and enzyme treatments (α-amylase and glucoamylase). However, the activity was not stable against variations in water content and pH value. The antioxidative activity of ANOX sugar was stabilized by treating with boiled water or nitrogen gas, or by pH adjustment.

Topics: alpha-Amylases; Antioxidants; Biotechnology; Biphenyl Compounds; Drug Stability; Food Additives; Glucan 1,4-alpha-Glucosidase; Hot Temperature; Hydrogen-Ion Concentration; Nitrogen; Phytic Acid; Picrates; Starch; Tartrates; Water

2011

Synthesis and antioxidant properties of pulvinic acids analogues.

Bioorganic & medicinal chemistry, 2010, Nov-15, Volume: 18, Issue:22

The synthesis of three types of pulvinic acid analogues, using a diversity-oriented strategy starting from a single compound, dimethyl l-tartrate, is described. Lacey-Dieckmann condensation, alcohol dehydration and Suzuki-Miyaura cross-couplings were employed in the course of the analogues syntheses. The evaluation of the antioxidant properties of the 28 synthesized analogues was carried out using antioxidant capacity assays (protection of thymidine and β-carotene) and free radical scavenging assays (DPPH radical and ABTS radical cation). This allowed to assess the relative influence of the groups bonded to the tetronic ring and to the exocyclic double bond on the activity, as well as the importance of this exocyclic double bond. It was shown that the presence of an electron-donating group on the 3-position of the tetronic ring had a beneficial effect. It was shown in several assays that the presence of the exocyclic bond was not crucial to the activity.

Topics: Benzothiazoles; beta Carotene; Biphenyl Compounds; Carboxylic Acids; Free Radical Scavengers; Lactones; Picrates; Sulfonic Acids; Tartrates; Thymidine

2010