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Aconitic Acid (aconitic + acid)
Selected AbstractsCOMPOSITION OF THE SOLUBLE, NONDIALYZABLE COMPONENTS IN RAW CANE SUGARJOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 5 2001MARY AN GODSHALL The high molecular weight (HMW) material (> 12,000 Da) of ten raw cane sugars from seven countries and two U.S. states was isolated by dialysis and analyzed by gel permeation chromatography (GPC). Simultaneous detection of colorant polymers and polysaccharides was accomplished by using two detectors in series , UV at 214 nm for colorant polymers and refractive index (RI) for carbohydrate polymers. The monosaccharide composition of the nondialyzable raw sugar fraction (the tenate) was determined by hydrolysis with trifluoroacetic acid and with oxalic acid. Aconitic acid was associated with the tenate. The raw sugars were categorized into two types according to their GPC patterns and aconitic acid content. Hydrolysis of individually collected GPC peaks demonstrated that one particular peak contained most of the aconitic acid. [source] ORGANIC ACIDS PROFILE IN TOMATO JUICE BY HPLC WITH UV DETECTIONJOURNAL OF FOOD QUALITY, Issue 1 2007OMBRETTA MARCONI ABSTRACT A simple method was developed to determine 10 organic acids simultaneously in tomato products using reverse-phase high performance liquid chromatography (HPLC) column with the diode array detector set at 210 nm. After centrifugation and filtration, the samples were passed through to an anion exchange resin and the organic acids were released using 0.1 N HCl. The chromatographic separation was achieved with isocratic analysis in a 20-min run. The method was reliable and sensitive. The coefficient of determination of the standard calibration curve is 0.9925 , r2 , 0.9999 and the limit of detection ranged from 0.08 to 6.00 mg/kg for trans -aconitic acid and acetic acid, respectively. The limit of quantification ranged from 0.19 to 15.18 mg/kg for trans-aconitic and acetic acid, respectively. To establish the efficiency of the anion resin the procedure was applied to a standard solution of a mixture of organic acids. The organic acids recovery ranged from 87.0% ± 1.9 for citramalic acid to 109.9% ± 5.2 for fumaric acid. [source] Comparison of different phosphorus-fertiliser matrices to induce the recovery of phosphorus-deficient maize plantsJOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE, Issue 6 2009Javier Erro Abstract BACKGROUND: Previous studies have demonstrated the capacity of a new type of mineral fertiliser, known as rhizosphere-controlled fertiliser (RCF), to supply adequate nutrition to plants while minimising nutrient losses. This fertiliser family is based on the presence a phosphoric matrix composed of metal,humic,phosphates, soluble not in water but in the rhizospheric acids released by plant roots as an expression of nutritional needs, principally citric acid. The aim of this study is to investigate the capacity of the RCF matrix and other phosphorus-containing products to induce the recovery of phosphorus-deficient maize plants. RESULTS: The results showed that RCF-based P fertilisers were able to facilitate plant recovery, measured by the dry root and shoot weights, to the same extent as a water-soluble P fertiliser (monopotassium phosphate). This fact was well correlated to both the variation pattern of citric and trans -aconitic acids in the shoot and roots during the treatment, and P shoot and root contents. Likewise the analysis of the variation of P concentration in the nutrient solution during the treatment indicates that plant recovery is associated with the capacity of the plant to mobilise P from the different fertiliser matrices studied. CONCLUSION: These results confirm the findings obtained in previous in vitro studies and indicate the suitability of RCF strategy for the preparation of mineral fertilisers with a nutrient release pattern more sensitive to plant nutritional needs. Copyright © 2009 Society of Chemical Industry [source] | ||||||||||