Phenolic compounds are intermediary transformation products of many naturally occurring substances and synthetic chemicals, including crop residues, organic wastes, pesticides and industrial products. They are suitable substrates for the phenolases and peroxidases produced by the soil microflora. Although measurement of the enzymatic oxidation of phenolic compounds is an important measure of th...

The major metabolites of epinephrine have been recently identified as the 0-methylated derivatives, 3-methoxy-4-hydroxymandelic acid (1)) metanephrine (2)) and 3-methoxy-4hydroxyphenylglycol (3). The corresponding catechols, 3,4dihydroxymandelic acid (4), 3,4-dihydroxyphenylglycol (5)) and epinephrine and its conjugates (6) were found to be minor excretion products. The present study was design...

The sensorial qualities, the nutritional value, and the large amount of vitamins of the avocado justify the expansion of the fruit consumption. The nutritional value of avocado is due to its high lipidic (8.4%) and proteic (1.2%) contents, which may reach 30% of its pulp. Due to its chemical composition it also becomes appropriate for industrial purposes (CANTO; SANTOS; TRAVAGLIN, 1980; TANGO; ...

The antioxidant potential of eight clingstone peach cultivars was investigated by determining phenolic compounds and inhibition of low-density lipoprotein (LDL) oxidation. Cultivars low in polyphenol oxidase (PPO) were also selected to minimize enzymatic browning. Inhibition of LDL oxidation varied from 17.0 to 37.1% in peach flesh extract, from 15.2 to 49.8% in whole peach extract, and from 18...

It was only natural that the earlier investigators of the action of the oxidase, tyrosinase, on catechol should have assumed that the first stage in the reaction is the formation of o-quinone. More recently this view of the reaction has gained additional approval from the studies carried on by Pugh and Raper (1). One of the difficulties encountered in trying to determine the nature of the initi...

Polyphenol oxidase(PPO) (E.C. number 1.10.3.1) has ubiquitous distribution in almost all living organism. Whereas, peroxidase(POD) (E.C. number 1.11.1) act as hormone regulation and defense mechanism in plants. Keeping in pace with their present-day industrial application, efforts have been made to evaluate the activity of these two enzymes (PPO and POD) using pepper pericarp (Capsicum annuum L...

1. L-DOPA was administered to rats by twice daily intraperitoneal injection for a period of eleven days. The daily dose was gradually increased from 250 mg/kg to 1 g/kg. The animals were killed 12 h after the last injection and tissue catechol-O-methyl transferase, DOPA-decarboxylase and monoamine oxidase activity determined.2. Catechol-O-methyl transferase activity was reduced in the liver (46...

Agricultural land abandonment is an emerging problem in European Union (EU), and about 11% of agricultural EU at high risk the coming 10 years. Land may have both positive negative effects ecosystems. Due to potential for increase soil fertility, study vegetation succession on quality great importance. In this study, we investigated abandoned vineyard where, after a period 30 years, rows alleys...