scholarly journals Organic acids to eliminate interference by phosphorus in the analysis of silicon by molecular absorption

2017 ◽  
Vol 70 (2) ◽  
pp. 8183-8189
Author(s):  
Enrique M Combatt Caballero ◽  
Daniel Palacio Badel ◽  
Manuel Palencia Luna
Keyword(s):  
Software Development ◽  
Organic Acids ◽  
Tartaric Acid ◽  
Available Phosphorus ◽  
Molecular Absorption ◽  
R Software ◽  
Chemical Interference ◽  
Absorption Spectrophotometry ◽  
Agricultural Sciences

One of the problems for quantifying the amount of silicon available by molecular absorption is the elimination of chemical interference caused by available phosphorus. The aim of this work was to evaluate different organic acids in eliminating the interference caused by phosphorus in the quantification of available silicon by molecular absorption. The experiments were conducted in the Soil laboratory of the College of Agricultural Sciences at the Universidad de Córdoba, Colombia. For this work, different acids such as tartaric, citric, oxalic and malic were evaluated at two concentrations (0.8 and 1.33 mol L-1). Solutions containing silicon (1 mg L-1) and six concentrations of phosphorus were prepared (0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 mg L-1). The quantification of silicon was conducted by molecular absorption spectrophotometry using a Perkin Elmer Lambda XLS + at 660 nm. The results were subjected to the LSD tests and contrasts using the R software (Development Core Team, version 3.2.2).The results indicated that the oxalic, citric and malic acids at both concentrations produced lower overestimation of silicon in the presence of the P concentrations 0.6, 0.8 and 1.0 mgL-1 than the tartaric acid, which is commonly used as a reference to remove the P interference.

Leaching of Pewterware by Organic Acids

1977 ◽  
Vol 60 (6) ◽  
pp. 1408-1413
Author(s):  
John H Gould
Keyword(s):  
Organic Acids ◽  
Tartaric Acid ◽  
Atomic Absorption Spectrophotometry ◽  
Leach Solution ◽  
The Other ◽  
Acid Solutions ◽  
Absorption Spectrophotometry ◽  
Acid Leach ◽  
Mineral Acids ◽  
Tartaric Acid Solution

Abstract Three pewter goblets were repeatedly leached by acetic, citric, lactic, malonic, and tartaric acid solutions. The leach solutions were periodically analyzed for Pb, Cd, Cu, Bi, Sb, and Sn by atomic absorption spectrophotometry. Analysis of the leach solutions showed that, without the addition of nitric or perchloric acid to the acetic and malonic acid leach solutions, Pb precipitated from the solutions on standing. Addition of the mineral acids redissolved the precipitate. Pb, Cd, and Bi were found in higher concentrations in the leach solution than in the metal; Cu and Sb were less concentrated in the leach, while the amount of Sn was approximately equal in both. Tartaric acid solution dissolved about 9 times as much metal from the pewter as the other organic acids but removed less Pb than acetic or malonic acids. None of these samples tested exceeded the Food and Drug Administration standards for Pb or Cd release.

scholarly journals Short-term effects of phosphate fertilizer enriched with low molecular weight organic acids on phosphorus release kinetic and availability under calcareous conditions in arid region

2018 ◽  
Vol 2 ◽  
pp. 66
Author(s):  
Adil Mihoub ◽  
Mustapha Daddi Bouhoun ◽  
Asif Naeem
Keyword(s):  
Molecular Weight ◽  
Acid Solution ◽  
Organic Acids ◽  
Phosphorus Release ◽  
Favorable Effect ◽  
Available Phosphorus ◽  
Low Molecular Weight ◽  
Release Kinetic ◽  
P Availability ◽  
Phosphate Fertilizers

Phosphate reactions and retention in the soil are of paramount importance from the perspective of plant nutrition and fertilizer use efficiency. The objective of this work was to investigate the effect of some low molecular weight organic acids (LMWOAs) on phosphorus release kinetic and its availability in calcareous soil. Experiments were conducted in laboratory. Soil-limestone mixtures were prepared to achieve highly calcareous samples (i.e. 50% CaCO3). The prepared samples were mixed thoroughly with phosphate fertilizers i.e. Triple super phosphate (TSP) and Monoammonium Phosphate (MAP) and watered with distilled water only (CK), with citric acid solution (CA) and with oxalic acid solution (OA). The treatments were arranged in a CRD with three replications and incubated at 25 ± 2°C and 80% soil moisture for a period of 960 h. The parabolic model was used for describing the decrease in P with time. As a result, all treatments showed a significant decrease in available P with time. Using LMWOAs showed important results and combination of phosphate fertilizers with both LMWOAs solutions exerted a very favorable effect on P availability in soil. The parabolic diffusion equation used was fitted well to experimental data. Addition of LMWOAs decreased loss in extractability of P with increasing soil available phosphorus fraction. Moreover, treatments irrigated by LMWOAs solutions released a lot of phosphorus compared to untreated treatments.

CCD detectors for molecular absorption spectrophotometry. A theoretical and experimental study on characteristics and performance

The Analyst ◽  
2010 ◽  
Vol 135 (3) ◽  
pp. 564 ◽  
Author(s):  
Javier Galbán ◽  
Susana de Marcos ◽  
Isabel Sanz ◽  
Carlos Ubide ◽  
Juan Zuriarrain
Keyword(s):  
Experimental Study ◽  
Molecular Absorption ◽  
Absorption Spectrophotometry ◽  
And Performance ◽  
Ccd Detectors

scholarly journals Potassium Improves Drought Stress Tolerance in Plants by Affecting Root Morphology, Root Exudates and Microbial Diversity

Metabolites ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 131
Author(s):  
Qiwen Xu ◽  
Hao Fu ◽  
Bo Zhu ◽  
Hafiz Athar Hussain ◽  
Kangping Zhang ◽  
...  
Keyword(s):  
Microbial Community ◽  
Drought Stress ◽  
Organic Acids ◽  
Microbial Diversity ◽  
Root Exudates ◽  
Root Morphology ◽  
Diversity Index ◽  
Equation Modeling ◽  
Available Phosphorus ◽  
Underground Part

Potassium (K) reduces the deleterious effects of drought stress on plants. However, this mitigation has been studied mainly in the aboveground plant pathways, while the effect of K on root-soil interactions in the underground part is still underexplored. Here, we conducted the experiments to investigate how K enhances plant resistance and tolerance to drought by controlling rhizosphere processes. Three culture methods (sand, water, and soil) evaluated two rapeseed cultivars’ root morphology, root exudates, soil nutrients, and microbial community structure under different K supply levels and water conditions to construct a defensive network of the underground part. We found that K supply increased the root length and density and the organic acids secretion. The organic acids were significantly associated with the available potassium decomposition, in order of formic acid > malonic acid > lactic acid > oxalic acid > citric acid. However, the mitigation had the hormesis effect, as the appropriate range of K facilitated the morphological characteristic and physiological function of the root system with increases of supply levels, while the excessive input of K could hinder the plant growth. The positive effect of K-fertilizer on soil pH, available phosphorus and available potassium content, and microbial diversity index was more significant under the water stress. The rhizosphere nutrients and pH further promoted the microbial community development by the structural equation modeling, while the non-rhizosphere nutrients had an indirect negative effect on microbes. In short, K application could alleviate drought stress on the growth and development of plants by regulating the morphology and secretion of roots and soil ecosystems.

scholarly journals The Effects of Essential Oils and Organic Acids on Microbiological and Physicochemical Properties of Whole Shrimps at Refrigerated Storage

2018 ◽  
Vol 6 (2) ◽  
pp. 273-283 ◽  
Author(s):  
WAN NORHANA MD NOORDIN ◽  
NANNTHINI SHUNMUGAM ◽  
NURUL HUDA ◽  
FREDERICK ADZITEY
Keyword(s):  
Lactic Acid ◽  
Organic Acids ◽  
Essential Oils ◽  
Tartaric Acid ◽  
Storage Period ◽  
Plate Count ◽  
Sodium Metabisulfite ◽  
Cinnamon Oil ◽  
Low Temperature Storage ◽  
Aerobic Plate Count

The objectives of this study were to determine the effects of Essential Oils (EOs) and Organic Acids (OAs) on microbiological and physicochemical qualities of whole shrimps stored at 4°C. Shrimps of 1.1 kg were dipped in solutions of Eos (cinnamon oil, garlic oil and lime oil) and Organic Acids (lactic acid, tartaric acid and sodium diacetate) at 1:2 shrimp/treatment solution (w/w) at 25ºC for 30min. Concentration of sodium metabisulfite and distilled water (DH2O) were used as positive and negative controls, respectively. Shrimps were drip-dried for 5 minutes, packaged and stored in a chiller (4°C) for 10 days. They were analyzed for microbiological (Total Aerobic Plate Count) and physicochemical (pH, colour and texture) properties at days 0, 2, 5, 7 and 10. Total Aerobic Plate Count (TPC) of shrimps decreased immediately after dipping in solutions containing EOs, OAs and their mixture ratios. However, the TPC of shrimps continued to increase during storage and at day 10, TPC was significantly (P<0.05) higher compared to other days. Mixtures of tartaric acid and cinnamon oil was the best in controlling TPC in shrimps. pH of shrimps ranged from 6.60 to 7.86. Most of the treatments had significantly lower pH compared to DH2O treated shrimp. L* values (Lightness), a* values (Redness) and b* values (Yellowness) ranged from 32.57-42.27, -1.90-4.39 and 3.14-10.67, respectively. The texture (hardness value) of the shrimps ranged from 1135.4-2511.8 and decreased throughout storage period except solutions of lactic acid and lime. Storage of shrimps in EOs and organic acids can serve as an alternative for the preservation of shrimps other than low temperature storage.

scholarly journals BX795-Organic Acid Coevaporates: Evaluation of Solid-State Characteristics, In Vitro Cytocompatibility and In Vitro Activity against HSV-1 and HSV-2

Pharmaceutics ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1920
Author(s):  
Yogesh Sutar ◽  
Tejabhiram Yadavalli ◽  
Sagar Kumar Paul ◽  
Sudipta Mallick ◽  
Raghuram Koganti ◽  
...  
Keyword(s):  
Citric Acid ◽  
Antiviral Activity ◽  
Organic Acids ◽  
Organic Acid ◽  
Tartaric Acid ◽  
Fumaric Acid ◽  
Amorphous Systems ◽  
Amorphous System ◽  
Hsv 1

BX795 is a TANK binding kinase-1 inhibitor that has shown excellent therapeutic activity in murine models of genital and ocular herpes infections on topical delivery. Currently, only the BX795 free base and its hydrochloride salt are available commercially. Here, we evaluate the ability of various organic acids suitable for vaginal and/or ocular delivery to form BX795 salts/cocrystals/co-amorphous systems with the aim of facilitating pharmaceutical development of BX795. We characterized BX795-organic acid coevaporates using powder X-ray diffractometry, Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, 1H-nuclear magnetic resonance spectroscopy, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC) to elucidate the interaction between BX795 and various organic acids such as taurine, maleic acid, fumaric acid, tartaric acid, and citric acid. Furthermore, using human corneal epithelial cells and HeLa cells, we evaluated BX795-organic acid coevaporates for in vitro cytocompatibility and in vitro antiviral activity against herpes simplex virus-type 1 (HSV-1) and type-2 (HSV-2). Our studies indicate that BX795 forms co-amorphous systems with tartaric acid and citric acid. Interestingly, the association of organic acids with BX795 improved its thermal stability. Our in vitro cytocompatibility and in vitro antiviral studies to screen suitable BX795-organic acid coevaporates for further development show that all BX795-organic acid systems, at a concentration equivalent to 10 µM BX795, retained antiviral activity against HSV-1 and HSV-2 but showed differential cytocompatibility. Further, dose-dependent in vitro cytocompatibility and antiviral activity studies on the BX795-fumaric acid system, BX795-tartaric acid co-amorphous system, and BX795-citric acid co-amorphous system show similar antiviral activity against HSV-1 and HSV-2 compared to BX795, whereas only the BX795-citric acid co-amorphous system showed higher in vitro cytocompatibility compared to BX795.

scholarly journals Influence des teneurs en acide malique des moûts sur le dosage de l'acide tartrique par analyse en flux continu par colorimétrie avec le métavanadate

OENO One ◽  
1985 ◽  
Vol 19 (4) ◽  
pp. 249
Author(s):  
J. Trossais ◽  
Christian Asselin
Keyword(s):  
Organic Acids ◽  
Tartaric Acid ◽  
Malic Acid ◽  
Continuous Flow ◽  
Colorimetric Method ◽  
The Other ◽  
Flow Method ◽  
Continous Flow ◽  
Continuous Flow Method ◽  
Acid Determination

<p style="text-align: justify;">Les auteurs ont constaté que la méthode en flux continu, qu'ils utilisent pour doser l'acide tartrique dans les moûts et les vins basée sur la réaction colorée avec le métavanadate et dérivée de la méthode rapide de BLOUIN-VIDAL ne donne pas satisfaction, Ils constatent des écarts inférieurs à 20 p. 100 par rapport à la méthode de REBELEIN qui repose sur le même principe. Ces écarts sont dûs à l'interférence des autres acides organiques du moût et du vin, notamment l'acide malique, interférence corrigée dans la méthode de REBELEIN. La comparaison des trois méthodes précitées les conduit à proposer pour la méthode en flux continu l'application d'un facteur correctif pour tenir compte de la présence de l'acide malique en concentration importante dans les moûts du Val de Loire.</p><p style="text-align: justify;">+++</p><p style="text-align: justify;">The authors noted that the continuous flow method based on the colorimetric method with metavanadate, derived from the method of BLOUIN-VIDAL, for the tartaric acid determination was not satisfactory. They noted variations, by 20 p. 100 lower, compared with the method of REBELEIN based on the same principe. These variations are due to the interference with the other organic acids of musts and wines, especially malic acid, which is limited in the method of REBELEIN. The comparison of the three methods induce the authors to propose for the continous flow method the utilisation of a factor to correct for the presence of malic acid at large concentration in the musts of Val de Loire.</p>

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