scholarly journals Corrigenda - Water-soluble constituents of fruit. II. The separation of acids on anion-exchange resins: The isolation of l-auinic acid from Apricots

1955 ◽  
Vol 8 (2) ◽  
pp. 267
Author(s):  
EFLJ Anet ◽  
TM Reynolds
Keyword(s):  
Anion Exchange ◽  
Water Soluble ◽  
Anion Exchange Resins ◽  
Exchange Resins

Water-soluble constituents of fruit. II. The separation of acids on anion-exchange resins: the isolation of l-auinic acid from Apricots

1955 ◽  
Vol 8 (2) ◽  
pp. 267
Author(s):  
EFLJ Anet ◽  
TM Reynolds
Keyword(s):  
Organic Acids ◽  
Silver Nitrate ◽  
Anion Exchange ◽  
Water Soluble ◽  
Hydroxy Acids ◽  
Anion Exchange Resins ◽  
Rf Values ◽  
Solvent Systems ◽  
Basic Anion ◽  
Exchange Resins

Displacement chromatography on columns of strongly basic anion-exchange resins has been used to separate, isolate, and purify some water-soluble organic acids. The order of emergence of 27 acids from these columns is recorded. Using this method pure l-quinic, succinic, L-malic, and citric acids were isolated from the flesh of the apricot fruit. The method was also used for the purification of hydroxy-acids. The detection of acids on paper chromatograms with a silver nitrate reagent is described ; silver nitrate-sodium hydroxide was used to detect acids having a vic.-glycol or α-keto group. The RF values for 30 acids in two solvent systems are recorded.

Water-soluble constituents of fruit. IV. The organic acids in peaches

1955 ◽  
Vol 8 (2) ◽  
pp. 280 ◽  
Author(s):  
EFLJ Anet ◽  
TM Reynolds
Keyword(s):  
Citric Acid ◽  
Organic Acids ◽  
Anion Exchange ◽  
Galacturonic Acid ◽  
Water Soluble ◽  
Mucic Acid ◽  
Immature Fruit ◽  
Anion Exchange Resins ◽  
Basic Anion ◽  
Exchange Resins

The acids in several varieties of peaches were separated by displacement chromatography on strongly basic anion-exchange resins. l-Quinic, L-malic, and citric acids were the three main acids, any one of them being the predominant acid depending on the variety, season, and maturity of the fruit. Mucic acid was found in small quantity in all samples ; galacturonic acid was only present in fruit picked at commercial maturity and ripened at 20 �C. The effect of maturity on the three major acids was studied for one crop of Blackburn Elberta peaches; the immature fruit contained only traces of citric acid.

Removal of Hydrophobic and Hydrophilic Constituents by Anion Exchange Resin

1999 ◽  
Vol 40 (9) ◽  
pp. 207-214 ◽  
Author(s):  
J.-P. Croué ◽  
D. Violleau ◽  
C. Bodaire ◽  
B. Legube
Keyword(s):  
Molecular Weight ◽  
Anion Exchange ◽  
Water Source ◽  
Atomic Ratio ◽  
Size Exclusion ◽  
Salting Out ◽  
Anion Exchange Resins ◽  
Hydrophilic Character ◽  
Exchange Resins

The objective of this work was to compare the affinity of well characterized NOM fractions isolated from two surface waters with strong (gel matrix and macroporous matrix) and weak anion exchange resins (AER) using batch experiment conditions. The structural characterization of the fraction of NOM has shown that the higher the hydrophilic character, the lower the C/O atomic ratio, the lower the SUVA, the lower the aromatic carbon content and the lower the molecular weight. In general (not always), strong AER was more efficient to remove DOC than weak AER. For the same water source (Suwannee River), the higher the molecular weight of the NOM fraction, the lower the affinity with AER. Increasing the ionic strength favored the removal of the hydrophobic NOM fraction (“salting out” effect) while increasing the pH apparently reduced the removal of the hydrophilic NOM fraction. Results were discussed in terms of size exclusion, adsorption, anion exchange and also hydrophobic/hydrophilic repulsion.

scholarly journals Impact of anion exchange adsorbents on regional citrate anticoagulation

2020 ◽  
pp. 039139882094773
Author(s):  
Karin Strobl ◽  
Stephan Harm ◽  
Ute Fichtinger ◽  
Claudia Schildböck ◽  
Jens Hartmann
Keyword(s):  
Anion Exchange ◽  
Regional Citrate Anticoagulation ◽  
Liver Support ◽  
Anion Exchange Resins ◽  
Increased Risk ◽  
Extracorporeal Liver Support ◽  
Target Molecules ◽  
Exchange Resins ◽  
The Impact

Introduction: Heparin and citrate are commonly used anticoagulants in membrane/adsorption based extracorporeal liver support systems. However, anion exchange resins employed for the removal of negatively charged target molecules including bilirubin may also deplete these anticoagulants due to their negative charge. The aim of this study was to evaluate the adsorption of citrate by anion exchange resins and the impact on extracorporeal Ca2+ concentrations. Methods: Liver support treatments were simulated in vitro. Citrate and Ca2+ concentrations were measured pre and post albumin filter as well as pre and post adsorbents. In addition, batch experiments were performed to quantify citrate adsorption. Results: Pre albumin filter target Ca2+ concentrations were reached well with only minor deviations. Citrate was adsorbed by anion exchange resins, resulting in a higher Ca2+ concentration downstream of the adsorbent cartridges during the first hour of treatment. Conclusions: The anion exchange resin depletes citrate, leading to an increased Ca2+ concentration in the extracorporeal circuit, which may cause an increased risk of clotting during the first hour of treatment. An increase of citrate infusion during the first hour of treatment should therefore be considered to compensate for the adsorption of citrate.

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