The development of phototrophic biofilms deteriorating stone cultural heritage is a well-known phenomenon that causes not only discoloration but also micro-decohesion of substrates. Recently, essential oils (EOs) have resulted as successful natural biocides to be used for the restoration of cultural heritage as an alternative to chemicals. In a first experiment EOs of Lavandula angustifolia Mill. and Thymus vulgaris L. at 5% concentration were tested against cyanobacterial biofilms. Moreover, to develop a suitable protocol for in situ application, diverse concentrations (0.5% - 0.25% - 0.1%) of T. vulgaris EO were encapsulated within an alginate hydrogel and applied for different times on cyanobacterial biofilms. Chemical profiles of the two EOs were investigated via GC-MS, to identify the main plant compounds underlying the biocidal effects. Results showed that T. vulgaris EO, rich in thymol, had the greatest inhibitory effect of photosynthetic efficiency compared to essential oil of L. angustifolia, especially if suspended into hydrogel. The development of such innovative protocol allowed the concentration of the tested essential oil to be 0.1% (v/v), maintaining antimicrobial efficacy against cyanobacteria and reducing the volatility of the terpene components. This innovative method will facilitate the application also on vertical surfaces and the removal of the biofilm.

Ranaldi, R., Rugnini, L., Gabriele, F., Spreti, N., Casieri, C., Di Marco, G., et al. (2022). Plant essential oils suspended into hydrogel: Development of an easy-to-use protocol for the restoration of stone cultural heritage. INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 172, 105436 [10.1016/j.ibiod.2022.105436].

Plant essential oils suspended into hydrogel: Development of an easy-to-use protocol for the restoration of stone cultural heritage

Rugnini L.;Di Marco G.;Gismondi A.;Bruno L.
2022

Abstract

The development of phototrophic biofilms deteriorating stone cultural heritage is a well-known phenomenon that causes not only discoloration but also micro-decohesion of substrates. Recently, essential oils (EOs) have resulted as successful natural biocides to be used for the restoration of cultural heritage as an alternative to chemicals. In a first experiment EOs of Lavandula angustifolia Mill. and Thymus vulgaris L. at 5% concentration were tested against cyanobacterial biofilms. Moreover, to develop a suitable protocol for in situ application, diverse concentrations (0.5% - 0.25% - 0.1%) of T. vulgaris EO were encapsulated within an alginate hydrogel and applied for different times on cyanobacterial biofilms. Chemical profiles of the two EOs were investigated via GC-MS, to identify the main plant compounds underlying the biocidal effects. Results showed that T. vulgaris EO, rich in thymol, had the greatest inhibitory effect of photosynthetic efficiency compared to essential oil of L. angustifolia, especially if suspended into hydrogel. The development of such innovative protocol allowed the concentration of the tested essential oil to be 0.1% (v/v), maintaining antimicrobial efficacy against cyanobacteria and reducing the volatility of the terpene components. This innovative method will facilitate the application also on vertical surfaces and the removal of the biofilm.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/01
English
Biodeterioration
Cultural heritage
Cyanobacterial biofilms
Essential oils
Hydrogel
Photosynthetic yield
Ranaldi, R., Rugnini, L., Gabriele, F., Spreti, N., Casieri, C., Di Marco, G., et al. (2022). Plant essential oils suspended into hydrogel: Development of an easy-to-use protocol for the restoration of stone cultural heritage. INTERNATIONAL BIODETERIORATION & BIODEGRADATION, 172, 105436 [10.1016/j.ibiod.2022.105436].
Ranaldi, R; Rugnini, L; Gabriele, F; Spreti, N; Casieri, C; Di Marco, G; Gismondi, A; Bruno, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/302493
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