Photoreactivity and stability of flavonoid yellows used in cultural heritage

Sharif, Samaneh; Nabais, Paula; Melo, Maria João; Piña, Fernando; Oliveira, M. Conceição

doi:10.1016/j.dyepig.2021.110051

Cited by 15 publications

(12 citation statements)

References 45 publications

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“…The high photolytic resistance of myricitrin was an expected behavior, because flavonoids, among other polyphenols, have recognized stability against UV radiation, receiving prominence as ingredients in formulations of photoprotectants (Wang et al, 2022; Zhang et al, 2021). Myricitrin is a flavon‐3‐ol derivative, with a chemical structure ensuring good photochemical stability, because the excess energy absorbed by the molecule is dissipated through proton transfer in the excited state (Sharif et al, 2022). The same behavior is also observed for the standard myricitrin, whose photolytic degradation was about 7.4%.…”

Section: Resultsmentioning

confidence: 99%

Validation of stability‐indicating LC method, degradation study, and impact on antioxidant and antifungal activities of Eugenia uniflora leaves extract

Santos

Lima

Machado

et al. 2023

Biomedical Chromatography

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The aim of this study is to demonstrate the stability‐indicating capacity of an analytical method for Eugenia uniflora, enhance understanding of the stability of myricitrin, and assess the effect of degradation of spray‐dried extract (SDE) on antioxidant and antifungal activities. Validation of the stability‐indicating method was carried out through a forced degradation study of SDE and standard myricitrin. The antioxidant and antifungal activities of SDE were evaluated both before and after degradation. The quantification method described was found to be both accurate and precise in measuring myricitrin levels in SDE from E. uniflora, with excellent selectivity that confirmed its stability‐indicating capability. The forced degradation study revealed that the marker myricitrin is sensitive to hydrolysis, but generally stable under other stress conditions. By contrast, the standard myricitrin displayed greater susceptibility to degradation under forced degradation conditions. Analysis of the antioxidant activity of SDE before and after degradation showed a negative impact in this activity due to degradation, while no significant effect was observed on antifungal activity. The method described can be a valuable tool in the quality control of E. uniflora, and the findings can assist in determining the optimal conditions and storage of products derived from this species.

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Section: Resultsmentioning

confidence: 99%

Validation of stability‐indicating LC method, degradation study, and impact on antioxidant and antifungal activities of Eugenia uniflora leaves extract

Santos

Lima

Machado

et al. 2023

Biomedical Chromatography

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“…In the case of paintings and textiles, it has been found that with the passage of time the flavonoids from the paint’s compositions are transformed into phenolic acids, thus suffering an oxidative degradation. Thus, the use of natural antioxidants could contribute to a better conservation of these types of cultural heritage [ 56 ].…”

Section: Discussionmentioning

confidence: 99%

Eco-Friendly Solution Based on Rosmarinus officinalis Hydro-Alcoholic Extract to Prevent Biodeterioration of Cultural Heritage Objects and Buildings

Corbu

Gheorghe-Barbu

Marinaș

et al. 2022

IJMS

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Biodeterioration of cultural heritage is caused by different organisms capable of inducing complex alteration processes. The present study aimed to evaluate the efficiency of Rosmarinus officinalis hydro-alcoholic extract to inhibit the growth of deteriogenic microbial strains. For this, the physico-chemical characterization of the vegetal extract by UHPLC–MS/MS, its antimicrobial and antibiofilm activity on a representative number of biodeteriogenic microbial strains, as well as the antioxidant activity determined by DPPH, CUPRAC, FRAP, TEAC methods, were performed. The extract had a total phenol content of 15.62 ± 0.97 mg GAE/mL of which approximately 8.53% were flavonoids. The polyphenolic profile included carnosic acid, carnosol, rosmarinic acid and hesperidin as major components. The extract exhibited good and wide spectrum antimicrobial activity, with low MIC (minimal inhibitory concentration) values against fungal strains such as Aspergillus clavatus (MIC = 1.2 mg/mL) and bacterial strains such as Arthrobacter globiformis (MIC = 0.78 mg/mL) or Bacillus cereus (MIC = 1.56 mg/mL). The rosemary extract inhibited the adherence capacity to the inert substrate of Penicillium chrysogenum strains isolated from wooden objects or textiles and B. thuringiensis strains. A potential mechanism of R. officinalis antimicrobial activity could be represented by the release of nitric oxide (NO), a universal signalling molecule for stress management. Moreover, the treatment of microbial cultures with subinhibitory concentrations has modulated the production of microbial enzymes and organic acids involved in biodeterioration, with the effect depending on the studied microbial strain, isolation source and the tested soluble factor. This paper reports for the first time the potential of R. officinalis hydro-alcoholic extract for the development of eco-friendly solutions dedicated to the conservation/safeguarding of tangible cultural heritage.

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“…Following Pasteur's belief that "we are not able to conserve what we do not know," knowledge of the original materials that comprise our cultural heritage urgently needs to be furthered, ensuring their conservation and transfer to future generations. In recent years, we have shown that fundamental mechanisms are key to understanding the colour changes of anthraquinone reds, indigo blues, and flavonoid yellows [2,[11][12][13]. Through this knowledge, we have also contributed to the development of advanced analytical methods for their in-situ characterisation [14][15][16][17].…”

Section: Ancient Colours In Cultural Heritagementioning

confidence: 96%

“…To preserve these colours from the past, the colour's formulation needs to be identified, and the fundamental mechanisms of degradation must also be understood [2,12,13,[27][28][29][30][31][32][33]. Over the past decade, great progress has been made in understanding the degradation mechanisms of millenary dyes, such as indigo, an icon of our civilization and material culture.…”

Section: Organic-based Colourants In a Complex Milieumentioning

confidence: 99%

“…In paint reproductions, we are able to use every analytical technique necessary for in-depth characterisation, including a study of dyes by high-resolution mass spectrometry (HRMS/MS), coupled with an HPLC or Ultra Performance Liquid Chromatography systems, HPLC-HRMS/ MS, or UHPLC-HRMS/MS [13,19]. This is not possible on original medieval paints, because it is very difficult to obtain a micro-sample from an illumination with enough material to be extracted for it.…”

Section: Analysing Both the Original Materials And The Reconstructionsmentioning

confidence: 99%

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Between past and future: Advanced studies of ancient colours to safeguard cultural heritage and new sustainable applications

et al. 2023

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Photoreactivity and stability of flavonoid yellows used in cultural heritage

Cited by 15 publications

References 45 publications

Validation of stability‐indicating LC method, degradation study, and impact on antioxidant and antifungal activities of Eugenia uniflora leaves extract

Validation of stability‐indicating LC method, degradation study, and impact on antioxidant and antifungal activities of Eugenia uniflora leaves extract

Eco-Friendly Solution Based on Rosmarinus officinalis Hydro-Alcoholic Extract to Prevent Biodeterioration of Cultural Heritage Objects and Buildings

Between past and future: Advanced studies of ancient colours to safeguard cultural heritage and new sustainable applications

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