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.

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.

scholarly journals Remazol Black B removal from aqueous solutions and wastewater using weakly basic anion exchange resins

2011 ◽  
Vol 9 (5) ◽  
pp. 867-876 ◽  
Author(s):  
Monika Wawrzkiewicz ◽  
Zbigniew Hubicki
Keyword(s):  
Anion Exchange ◽  
Phenol Formaldehyde ◽  
Reactive Dye ◽  
Anion Exchangers ◽  
Phase Contact Time ◽  
Anion Exchange Resins ◽  
Remazol Black B ◽  
Basic Anion ◽  
Exchange Resins ◽  
Remazol Black

AbstractIn this study, the use of the weakly basic anion exchange resins of phenol-formaldehyde (Amberlyst A 23), polyacrylate (Amberlite IRA 67) and polystyrene (Lewatit MonoPlus MP 62) matrices for removal of the reactive dye Remazol Black B (RBB) from aqueous solution and wastewater were investigated. RBB sorption on the anion exchangers was a time dependent process. Color reduction percentiles of 75.2, 33.9 and 25.1% in wastewater treatment were found after 216 h of phase contact time with Lewatit MonoPlus MP 62, Amberlyst A 23 and Amberlite IRA 67, respectively. Inorganic salts and anionic surfactant action influenced RBB uptake by the anion exchangers. The amounts of dye retained by the anion exchangers increased with a rise in temperature. The maximum sorption capacities calculated from the Langmuir model were 66.4, 282.1 and 796.1 mg g−1 for Amberlite IRA 67, Amberlyst A 23 and Lewatit MonoPlus MP 62, respectively. Regeneration of phenol-formaldehyde and polystyrene resins were possible using 1 M NaOH, 2 M KSCN, 1M KSCN in 40–60% methanol as well as 1 M NaOH in 60% methanol.

scholarly journals Inside Cover: Aldol Condensations Catalyzed by Basic Anion-Exchange Resins (ChemCatChem 23/2016)

ChemCatChem ◽  
2016 ◽  
Vol 8 (23) ◽  
pp. 3558-3558
Author(s):  
Werner Bonrath ◽  
Yann Pressel ◽  
Jan Schütz ◽  
Erich Ferfecki ◽  
Klaus-Dieter Topp
Keyword(s):  
Anion Exchange ◽  
Anion Exchange Resins ◽  
Basic Anion ◽  
Exchange Resins
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