pollution arising from plastic waste materials caused a great worry for researchers who are interested in protection of environment. this problem shifts their subject to bio-polymers for applications in packaging industries. however, their low water barrier properties are a critical problem. the effects of citric acid and methyl cellulose on water vapor and oxygen permeabilities and mechanical ...

Two high-performance liquid chromatography (HPLC) methods for ascorbic acid (AA) quantification were compared in three cultivars of melon (Cucumis melo L.) fruits. Both procedures were analogous except for the extraction medium used: 6 % meta-phosphoric acid and 3 % citric acid. The general conclusion is that 3 % citric acid is a better extraction medium compared to 6 % meta-phosphoric acid and...

II. Photoreduction of Carbon Dioxide with Molecular Hydrogen............................... III. Photometabolism of Organic Compounds................................................. A. Photoproduction of Molecular Hydrogen............................................... B. The Stoichiometry of Hydrogen Production............................................ C. An Anaerobic Light-dependent Citric...

Introduction Soft drinks are complex mixtures containing a variety of substances such as coloring compounds, flavoring agents, acidifiers, sweeteners, preservatives, and caffeine. Acidulants reduce the soft drink’s pH and thereby assist in beverage preservation for long-term storage. Acidulants can also be used as chelating agents, buffers, coagulators, and flavoring agents. In the latter role,...

Glutaminolysis and citric acid cycle generate carbon sources and cellular energy in dependence of the biosynthesis needs. We here introduce a concept which combines a simple and practicable kinetic description of both pathways with a cell growth model to elucidate the influence of extracellular substrates, transport mechanisms and enzyme regulation on the metabolic activity. The derived model f...

The mobilization of chromium and nickel from an industrial soil was investigated using two biodegradable chelants (citric acid and histidine), compared with a persistent one (ethylenediaminetetraacetic acid). Successive metal mobilizations were carried out in batch experiments. The main reactions involved were estimated by modeling the system with MINEQL+. For a single mobilization, citric acid...

The electrocatalytic activity of cobalt(II)-phthalocyanine immobilized in a carbon paste electrode for citric acid oxidation under a diffusion-controlled electrochemical process was employed to develop a selective flow injection amperomettric analysis method. Under optimized conditions, rapid and reliable determinations of citric acid (65 samples per hour) were achieved for analyses of commerci...

Organic acids play pivotal role in flavor and consumer acceptance of fruit beverages. Concentration of some organic acids in citrus juices was determined through HPLC and their retention during refrigerated storage was also evaluated. The concentration of organic acids were in the following pattern Citric Acid> Malic Acid> Ascorbic Acid> Tartaric Acid. Citric acid, malic acid, ascorbic acid and...

In a completely Randomized Design, 8 Sows along with their litter were divided into 4 groups (G1 to G4) such that each group contained about 17 piglets totalling 69. A basal diet (control) was fed to G1 and diets of G2, G3 and G4 were made by adding citric acid, probiotic and a combination of these two, respectively. Growth performance of piglets fed with citric acid and probiotic (G4) recorded...

This paper focuses on how the surface chemical groups of sheep manure affect the adsorption capacity of cobalt ions. Improvement in cobalt ions uptake onto sheep manure was achieved successfully by introducing more carboxylic functional groups into its surface due to citric acid treatment. According to Langmuir model, cobalt ions uptake was increased from 22.88 mg/g for dried sheep manure (D-SM...