Formation of organic acids by fungi isolated from the surface of stone monuments

Sazanova, Katerina V.; Щипарев, С.М.; Vlasov, Dmitry Yu.

doi:10.1134/s002626171405021x

Cited by 27 publications

(14 citation statements)

References 11 publications

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“…The excretion of organic acids is the most effective factor of fungal impact on the stone surfaces, and the acidifying activity of fungi is often considered as an adaptive reaction to environmental changes (Sazanova et al . ). Furthermore, the production of organic acids suggests a competitive advantage for filamentous fungi in relation to other micro‐organisms by decreasing the environmental pH (Liaud et al .…”

Section: Resultsmentioning

confidence: 97%

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Ecology and identification of environmental fungi and metabolic processes involved in the biodeterioration of Brazilian soapstone historical monuments

Boniek

Mendes

Paiva

et al. 2017

Lett Appl Microbiol

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Minas Gerais, Brazil, is vulnerable to the activities of mineral extraction industries, posing an imminent risk to United Nations Educational, Scientific and Cultural Organization (UNESCO) recognized cities, e.g. Congonhas. Many of these municipalities hold many soapstone religious sculptures and historical monuments. Consequently, soapstone is susceptible to filamentous fungi attack causing irreversible biodeterioration. Despite the concern related to nondestructive sampling of 18th century sculptures, in this study, we have discussed the factors that lead to biodeterioration of soapstone due to organic acid excretion by the fungi that damage the stone, thereby providing an insight in conserving and preserving the soapstone monuments.

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Section: Resultsmentioning

confidence: 97%

“…In the present study, Periconia pseudobyssoides and Periconia macrospinosa (Ezequiel), Periconia byssoides (Daniel), Exophiala xenobiotica (Baruc), E. nigrum (Amós) and Penicillium citrinum (Habacuc) with high oxalic and citric acid production were detected, similar to the study of Sazanova et al . ().…”

Section: Resultsmentioning

confidence: 97%

Ecology and identification of environmental fungi and metabolic processes involved in the biodeterioration of Brazilian soapstone historical monuments

Boniek

Mendes

Paiva

et al. 2017

Lett Appl Microbiol

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“…At elevated carbohydrate concentrations, organic acids of malic, citric, succinic, and fumaric acids were identified mostly in liquid cultures, while oxalic acid was dominant among the acids produced by A. niger, and its production was decreased by P. citrinum at high carbohydrate concentrations [61]. Carbohydrates, especially fructose, are mainly involved in biosynthetic processes [62], which is suitable for the formation of organic acids in the Krebs cycle, such as fumaric, malic, and succinic acid synthesis.…”

Section: Hplc Analysis Of Organic Acidsmentioning

confidence: 99%

Illustration of the Effects of Five Fungi on Acacia saligna Wood Organic Acids and Ultrastructure Alterations in Wood Cell Walls by HPLC and TEM Examinations

et al. 2020

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In the present study, Acacia saligna (Labill.) H.L.Wendl. wood blocks with dimensions of 0.5 × 1 × 2 cm were inoculated with five molds (Aspergillus niger, A. flavus, Alternaria tenuissima, Fusarium culmorum, and Trichoderma harzianum) and the changes in the organic acids (oxalic, citric, tartaric, succinic, glutaric, acetic, propionic, and butyric) of powdered wood were analyzed by HPLC. The effects of the five inoculated fungi on the alterations to the wood cell wall ultrastructures were examined by TEM. The wood became more acidic as it was inoculated with the studied fungi. From the HPLC analysis, the oxalic acid (293.34 µg/g o.d.) in the A. saligna, A. tenuissima (167.33 µg/g o.d.), and T. harzianum (245.01 µg/g o.d.) wood decreased, but it increased in the A. flavus (362.08 µg/g o.d.), A. niger (1202.53 µg/g o.d.), and F. culmorum (431.85 µg/g o.d.) inoculated wood. Citric acid was observed in the wood inoculated with A. flavus (110 µg/g o.d) and A. niger (2499.63 µg/g o.d). Tartaric (1150.98 µg/g o.d), acetic (2.04 µg/g o.d), and propionic (1.79 µg/g o.d) acids were found in the wood inoculated with A. niger. Butyric acid was found in small amounts. A loss of wood substances appeared as the electron-lucent increased in the middle lamella and the layers of the secondary wall. Within the secondary cell wall regions, checks and splits were also noted, which resulted from the effects of the acids on the carbohydrates, according to the fungus type and the acids. In conclusion, increasing the amount of organic acids in the wood samples through inoculation with fungi results in more degradations in the wood, especially in the wood inoculated with A. niger.

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“…A . niger can secrete a large amount of organic acids, orexample, oxalic (Kα 1 = 6.5 × 10 −2 ), tartaric (Kα 1 = 9.2 × 10 −4 ), and citric acids (Kα 1 = 7.4 × 10 −4 ) . Therefore, the oxalic acid, with significantly high ionization constant, dominates the organic acid secretion.…”

Section: Introductionmentioning

confidence: 99%

“…A. niger can secrete a large amount of organic acids, orexample, oxalic (Kα 1 = 6.5 × 10 −2 ), tartaric (Kα 1 = 9.2 × 10 −4 ), and citric acids (Kα 1 = 7.4 × 10 −4 ). [15,16] Therefore, the oxalic acid, with significantly high ionization constant, dominates the organic acid secretion. The secreted organic acids are able to directly react with Pb 2+ to form soluble mineral crystals, called Pb oxalate (PbC 2 O 4 ), around both cell walls and external medium during bioremediation.…”

Section: Introductionmentioning

confidence: 99%

Tracking the fungus‐assisted biocorrosion of lead metal by Raman imaging and scanning electron microscopy technique

Shao

Jiao

et al. 2020

J Raman Spectroscopy

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Fungi play a significant role in biological corrosion of metal materials. We studied the biocorrosion of lead foils under incubation of Aspergillus niger (A. niger). Multiple techniques, for example, scanning electron microscopy (SEM), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and Raman imaging and scanning electron microscopy (RISE), were applied in this study. SEM confirmed the normal growth of the fungus on Pb foil surface, either above or under the solid medium surface. In addition, SEM‐energy dispersive spectrometer confirmed the formation of the secondary Pb mineral particles after incubation, which had variable morphologies. DRIFT was able to show changes of compounds formed on the surface of Pb foils. However, it cannot exactly identify the mineral phase. RISE technology offered both morphological and spectral information of the formed Pb mineral. Three dominant Raman peaks at ~1,440, ~1,480, and ~1,590 cm−1 indicated that the secondary mineral was lead oxalate. Raman mapping further demonstrated the distribution of Pb oxalate architecture. This study first applied RISE to investigate the biocorrosion of metals by fungi.

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Formation of organic acids by fungi isolated from the surface of stone monuments

Cited by 27 publications

References 11 publications

Ecology and identification of environmental fungi and metabolic processes involved in the biodeterioration of Brazilian soapstone historical monuments

Ecology and identification of environmental fungi and metabolic processes involved in the biodeterioration of Brazilian soapstone historical monuments

Illustration of the Effects of Five Fungi on Acacia saligna Wood Organic Acids and Ultrastructure Alterations in Wood Cell Walls by HPLC and TEM Examinations

Tracking the fungus‐assisted biocorrosion of lead metal by Raman imaging and scanning electron microscopy technique

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