Tertiary bioreceptivity of schists from prehistoric rock art sites in the Côa Valley (Portugal) and Siega Verde (Spain) archaeological parks: Effects of cleaning treatments

Sanmartín, Patricia; Fuentes, Elsa; Montojo, C.; Barreiro, P.; Paz-Bermúdez, Graciela; Prieto, B.

doi:10.1016/j.ibiod.2019.05.011

Cited by 19 publications

(10 citation statements)

References 43 publications

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“…The cleaning effect of the treatments was assessed immediately after treatment, and after one and two weeks, by color spectrophotometry, a reliable tool to evaluate the presence and vitality of phototrophs [30][31][32][33][34][35] and the cleaning effectiveness in granite [8,24].…”

Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

et al. 2020

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The society has become increasingly interested in using natural products over chemicals for cleaning activities. In this study, the cleaning potential of formulations embedded in a hydrogel matrix and composed respectively of essential oils (EOs) of Origanum vulgare, Thymus vulgaris, and Calamintha nepeta, and their respective main active components (EO-ACs), viz., Carvacrol, Thymol, and Pulegone, on a phototropic biofilm growing on granite was investigated. In addition, and for comparative purposes, analysis with the combination of the three EOs, the combination of the three EO-ACs, and Preventol RI-80® (one of the most effective commercial cleaning agents based on quaternary ammonium salts) in all three cases embedded in a hydrogel matrix, as well as only the hydrogel matrix, distilled water, and Preventol RI-80®, in both latter cases applied with brush, were also studied. The cleaning effect of the treatments was assessed immediately after the treatment and after one and two weeks by color spectrophotometry, a reliable tool to evaluate the presence and vitality of the phototrophs and the cleaning effectiveness in granite. C. nepeta and its active component Pulegone proved to be the most effective and yielded similar results, comparable to those of uncolonized granite, and better than those obtained with Preventol RI-80® applied with brush (most common way), especially at the end of the experiment. These promising first results support the suitable use of the phytochemical compounds used on phototrophs field where there are still few published studies and encourage further investigation toward the evaluation of their exhibited biocidal activity.

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Section: Evaluation Of Cleaning Effectiveness By Using Color Spectropmentioning

confidence: 99%

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

et al. 2020

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“…The patterns and drivers of biological colonization on buildings, which is closely related to the bioreceptivity concept (Guillite, 1995), is an interesting and topical field of study. Although bioreceptivity is determined by intrinsic characteristics of the substrate such as roughness and porosity (Guillite, 1995;Vázquez-Nion et al, 2018;Sanmartín et al, 2019), other factors such as the slope angle, surface geometry and degree of shading (Viles and Ahmad, 2016), presence of synthetic polymers and also surface colour have been found to influence phototrophic colonization.…”

Section: Discussionmentioning

confidence: 99%

Characterization of a biofilm and the pattern outlined by its growth on a granite-built cloister in the Monastery of San Martiño Pinario (Santiago de Compostela, NW Spain)

Sanmartín

Villa

Cappitelli

et al. 2020

International Biodeterioration & Biodegradation

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“…Signals recorded at 665 nm are the minimal fluorescence signal of dark-adapted cells (F 0 ) and the maximal fluorescence signal after a saturating light pulse in dark-adapted cells (F m ). These parameters made it possible to determinate the maximum quantum yield (Y= F v /F m =(F m -F 0 )/F m ), which is an indicator of the viability of photosynthetic microorganisms [50]. Relative differences ∆Y = Yt 0 -Yt 1 were calculated as an estimator of the vital activity of microorganisms, where ∆Y > 0 establishes the increase in the vital activity after the application of the treatments and, conversely, ∆Y< 0 the decrease in the vital activity.…”

Section: Pulse Amplitude Modulated (Pam) Fluorometrymentioning

confidence: 99%

Evaluation of the Cleaning Effect of Natural-Based Biocides: Application on Different Phototropic Biofilms Colonizing the Same Granite Wall

et al. 2023

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Natural derivatives, such as essential oils, are presented as an alternative to classical biocides to the treatment of biocolonization. Thus, in this work, the cleaning and biocidal potential of some natural derivatives towards two natural biofilms’ growth on the same granite wall, with different microbial composition, was evaluated. For this purpose, three essential oils (EOs) (from Origanum vulgare, Thymus vulgaris and Calamintha nepeta) and their main active principles (APs) (carvacrol, thymol and R-(+)-pulegone, respectively) were embedded in a hydrogel matrix, with different combinations of EOs and APs, in order to evaluate the synergistic action of different actives. For comparative purposes, pure hydrogel and a mechanical method (brushing) were also used. Colorimetric measurements and chlorophyll a fluorescence analyses were performed to evaluate the cleaning action of the treatments on the biofilms. Overall, the EOs and APs present in the hydrogel proved to be reliable treatments to limit natural biocolonization, with O. vulgare being one of the most effective treatments in combination with other compounds, due to the majority presence of carvacrol. Moreover, the effect of the different treatments strictly depended on the biofilm in question, as well as its ability to adhere to the substrate.

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Tertiary bioreceptivity of schists from prehistoric rock art sites in the Côa Valley (Portugal) and Siega Verde (Spain) archaeological parks: Effects of cleaning treatments

Cited by 19 publications

References 43 publications

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

Phytochemical Compounds as Cleaning Agents on Granite Colonized by Phototrophic Subaerial Biofilms

Characterization of a biofilm and the pattern outlined by its growth on a granite-built cloister in the Monastery of San Martiño Pinario (Santiago de Compostela, NW Spain)

Evaluation of the Cleaning Effect of Natural-Based Biocides: Application on Different Phototropic Biofilms Colonizing the Same Granite Wall

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