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humic acid

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humic acid

[′hyü·mik ′as·əd]
(organic chemistry)
Any of various complex organic acids obtained from humus; insoluble in acids and organic solvents.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive
Diameter of the 'B'-dependent lymphoid tissues in the ileum and spleen were significantly (P< 0.05) larger in fulvic acid-treated animals, fulvic acid supplementation resulted in strong humoral immune stimulation (Vucskits et al., 2010).
The measurements in the ultraviolet range were made in solutions of purified fulvic acids, diluted in pH-adjusted solutions to 2.0 with HCl and 12.0 with NaOH, in addition to the neutral buffered bicarbonate solution.
van Rensburg, "Randomized, parallel-group, double-blind, controlled study to evaluate the efficacy and safety of carbohydrate-derived fulvic acid in topical treatment of eczema," Clinical, Cosmetic and Investigational Dermatology, vol.
Summary of the input values for trace metal speciation modelling: fractions of dissolved organic carbon (DOC) considered inert and active (i.e., colloidal fulvic acid (FA) and humic acid (HA)) to metal complexation Active Active Inert, % FA, % HA, % References 0 90 10 Unsworth et al.
Fulvic acid is lower molecular weight macromolecule, soluble at all pH values, mixture of yellow to brown color, These molecules are known to be heterogeneous polyacids with polymeric structure formed by different types of functional groups like aliphatic and aromatic organic acids having many aromatic rings attached to (carboxyl, phenols, quinones and semiquinones) [5,8,9,12] and the number of oxygen containing functional groups is more than humic acid [13].
Fulvic acid inhibits aggregation and promotes disassembly of tau fibrils associated with Alzheimer's disease.
* The fulvic acids seen a rapid physicochemical transformation.
It was assumed that high fulvic acid contained in chicken manure compost (Table 1) has also affected the ability of such compost in increasing P availability in Ultisol.
Fulvic acid is one of the nature's most powerful organic electrolytes that can balance and energise biological properties it comes into contact with (Baker, 1973).
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