Chemical modification of humic acids by the introduction of indole-containing fragments

Yarkova, T. A.

doi:10.3103/s0361521911040136

Cited by 10 publications

(7 citation statements)

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“…While Yarkova found peat and coal HAs showed insignificant inhibition of the growth of bacteria ( St. aureus , S. Enteritidis etc.) 18 , but a chemical modification of the initial structure of HAs by acylation could increase the biological activity of native peat and lignite HAs. That indicated the origin of HAs considerably influenced their antimicrobial activities and the main reason may be related to the difference in the chemical structure of the HAs.…”

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Fungicidal activities of soil humic/fulvic acids as related to their chemical structures in greenhouse vegetable fields with cultivation chronosequence

Song

Liu

et al. 2016

Sci Rep

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In the background of rapid expansion of plastic greenhouse vegetable production in China, many environmental risks have emerged in recent years. In this study, the soils with a chronosequence in greenhouse vegetable fields were collected and the soil humic acids (HAs) and fluvic acids (FAs) were extracted and purified. The soil HAs and FAs were found to show inhibition activities against phytopathogenic fungi for the first time. Fourier transform infrared spectroscopy was performed to investigate the chemical structures of HAs and FAs. The variation of relative peak areas indicated the chemical structure of HAs become more complex and stable under continuous cultivation. The PCA analysis showed HAs and FAs could be distinctly separated from each other and cultivation years mainly determined the variation. Mantel test and RDA analysis indicated the active components (aliphatic peaks for HAs and COOH, OH peaks for FAs) had positive correlation with the inhibition rates of HAs and FAs against phytopathogenic fungi. According to our research, the active fungicidal components in soil HAs and FAs decreased along with the extension of cultivation years, which made the soil suffer more risk to phytopathogenic fugi. So we believe continuous cultivation too many years in PGVP systems is inadvisable.

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confidence: 99%

Fungicidal activities of soil humic/fulvic acids as related to their chemical structures in greenhouse vegetable fields with cultivation chronosequence

Song

Liu

et al. 2016

Sci Rep

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“…aeruginosa and C. albicans. Yarkova (2011) observed that peat and coal HA showed complete growth inhibition of St. aureus and Candida, and a decrease in the number of colonies from 78-80% in E. coli and from 58-70% in S. Enteritidis. Aksu and Bozkurt (2009) fed broiler chickens diets supplemented with a commercial source of HA (Farmagulator Dry-Humic Acid TM ) and found that the CFU of E. coli in the digesta of birds fed either a diet with antibiotic and diets with HA were significantly lower than in those given the control.…”

Section: Discussionmentioning

confidence: 96%

“…The lack of effects of HA on Salmonella recovery in the in vitro assay and on intestinal colonization, bacterial counts in ceca, intestinal IgA and serum FITC-d in broilers may have been due to differences in the dosage and chemical composition of HA (Ansorg and Rochus, 1978;Yarkova, 2011). In the present study, the HA dosages were chosen from the reports of Kocabagli et al (2002) and Yoruk et al (2004).…”

Section: Discussionmentioning

confidence: 99%

“…aeruginosa and C. albicans (Ansorg and Rochus, 1978). In a recent report, it was observed that peat and coal HA showed a complete growth inhibition against St. aureus and Candida, and a decrease in the number of colonies from 78-80% in E. coli and from 58-70% in S. Enteritidis (Yarkova, 2011). It has been also speculated that HA stabilize the intestinal flora, and thus, ensure an improved utilization of nutrients in animal feed (Islam et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Humic Acids on Recovery of Salmonella Enterica Serovar Enteritidis

Maguey-González

Michel

Baxter

et al. 2018

Annals of Animal Science

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Enteritidis, were carried out. In experiment 2, one-day old male broiler chickens were randomly allocate to one of two groups (n=25) with or without 0.2% of isolated HA from worm-composte, and challenged with 10 6 CFU of S. Enteritidis per chicken at 10-d old. All chicks were euthanized 24-h hours post challenge, and were for serum fluorescein isothiocyanate dextran (FITC-d) determination. A section of ileum was removed to obtain total concentration of IgA.Ceca-cecal tonsils were removed to evaluate Salmonella recovery, total lactic acid bacteria (LAB) and total Gram negative bacteria. In experiment 1, neither concentration of commercial or natural HA were able to reduce the recovery of S. Enteritidis in any of the simulated compartments (P>0.05). Only the crop compartment showed significant differences in pH in both trials between control and treated groups. In experiment 2, no significant differences were

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“…In opposition to BMD, in in vitro and in vivo studies in which the effect of HS on the growth of E. coli have been evaluated, contrasting results have been found. In in vitro trials, the use of natural HS from peat and lignite had insignificant growth inhibition of E. coli (Yarkova, 2011) and the use of 87 sources of HS, mainly from soils, did not show any antimicrobial activity against E. coli (Ansorg & Rochus, 1978). However, inan in vitro study in which a modified FA by wet oxidation (oxifulvic acid) was used the growth of E. coli was effectively inhibited.…”

Section: Responses Of Broiler Chickens Fed Low or High Non-starch Pol...mentioning

confidence: 99%

Responses of Broiler Chickens Fed Low or High Non-Starch Polysaccharide Diets and the Addition of Humic Substances from a Worm Compost

Gómez-Rosales¹,

Angeles²,

López-Hernández³

et al. 2022

Braz. J. Poult. Sci.

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The objective was to evaluate the productivity, microbiology and histopathology of the jejunum, ceca and liver in broilers fed a control or a high non-starch polysaccharide (HNSPs) diet added with an extract of humic substances (EHS). 240 broilers individually allocated, from 21-42 d of age were assigned to a factorial arrangement of 2 types of diets: 1) A corn/soybean meal diet (Control) and 2) As Control plus 7% distillers dried grain with solubles and 12% of wheat bran (HNSPs), and 3 growth promoters: 1) Antibiotic growth promoters (AGP); 2) without AGP (NAGP) and C) with 0.5% of EHS. At the end of the trial, the breast and carcass were weighed and samples of the intestine, ceca and liver were taken for microbial and histopathology analysis. Results were subjected to ANOVA. EHS-fed broilers had lower feed conversion ratio (FCR) and total aerobic bacterial (TAB) counts in the liver and higher ashes digestibility with the Control diet, but negative responses were seen with the HNSPs diet (Type of diet and growth promoter interaction, p≤0.05). The lesion scores in the jejunum were lower in EHS-fed broilers with the Control and HNSPs diet (p≤0.05). The TAB and E. coli were lower in the jejunum and ceca of AGP-fed broilers (p<0.01) compared to NAGP and EHS groups. EHS-fed broilers showed improved FCR and ileal ashes digestibility and lower TAB in the liver with the Control diet and had lower lesion score in the jejunum and similar weight gain compared to the AGP-fed broilers.

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Chemical modification of humic acids by the introduction of indole-containing fragments

Cited by 10 publications

References 0 publications

Fungicidal activities of soil humic/fulvic acids as related to their chemical structures in greenhouse vegetable fields with cultivation chronosequence

Fungicidal activities of soil humic/fulvic acids as related to their chemical structures in greenhouse vegetable fields with cultivation chronosequence

Effects of Humic Acids on Recovery of Salmonella Enterica Serovar Enteritidis

Responses of Broiler Chickens Fed Low or High Non-Starch Polysaccharide Diets and the Addition of Humic Substances from a Worm Compost

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