fulvic acid


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a yellow to yellow-brown humic substance that is soluble in water under all pH conditions

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Biotechnologically produced fulvic acid (BFA), a compound substance which used in this study, is made from fermented raw materials such as straw or wood, supplemented with soybean meal and wheat bran, which are fermented by a variety of microorganisms.
Soluble alkaline material was then precipitated with 0.05 N [H.sub.2]S[O.sub.4] to fractionate humic and fulvic acids. The [C.sub.EX] and [C.sub.HA] were determined with the Mebius procedure (Nelson and Sommers 1982).
Humic substances (HS), the main constituent of organic matter, present heterogeneous mixture of organic compounds aggregated by weak intermolecular interactions of hydrophobic nature and by hydrogen bonds (Matilainen et al., 2011; Valencia et al., 2013), which are fractionated in humic acids (HA), fulvic acids (FA) and humins (Baldotto et al., 2013); HS have a structural complexity due to the presence of organic functional groups that provide several functions in the nutrition of plants and improvement of the physical and chemical properties of the soil.
Chang, "Fulvic acid attenuates homocysteine-induced cyclooxygenase-2 expression in human monocytes," BMC Complementary and Alternative Medicine, vol.
Fraction bound to colloid fulvic acid (FA) and humic acid (HA) (a, c, e) and free ion activity (b, d, f) of Cu in biochar (BC) eluates collected at various liquid to solid (L/S) ratios, predicted by WHAM.
Previous experiments by this research team have had success characterizing the acid soluble portion of NOM, fulvic acid (FA), by fractionating the mixture using high performance liquid chromatography (HPLC) before analysis.
In the proposed procedure using Hg(Ag)FE as a working electrode, the influence of surface active substances, such as Triton X-100 (nonionic surfactant), sodium dodecyl sulfate (SDS, anionic surfactant), cetyltrimethylammonium bromide (CTAB, cationic surfactant), and Rhamnolipid (biosurfactant) and humic substances, such as humic acids (HA), fulvic acids (FA), and natural organic matter (NOM), was examined.
This index is influenced by the quantity of organic matter to be decomposed, producing humic and/or fulvic acids, or by high concentrations of plants in general, which can cause the medium's acidification as a result of the process of photosynthesis (Moura, Martin, & Burguillo, 2007).
The active constituents of NOM are humic and fulvic acids. [12] Humic acid is a mixture of many different acids that contain carboxyl and phenolate groups which behave functionally as dibasic, and sometimes tribasic, acids.
Keywords: Fulvic acid; agriculture soil; AAS; UV-Visible; FTIR and NIR
Humus, which includes humin, humic acid (HA) and fulvic acid (FA), is the most important and largest constituent of soil organic matter and is formed by decomposition of plant and animal residues by micro-organisms.
Fulvic acid stimulates mitochondrial energy transfer and makes mitochondrial extraction of energy more efficient, (51) while humic substances speed the transfer of electrons along the electron transport chain, enhancing its efficiency.
Humic compounds, arranged in order of increasing weight are: fulvic acid, humic acid and humin [21].