Color measurements as a reliable method for estimating chlorophyll degradation to phaeopigments.

Abstract:

:The application of biocides is a traditional method of controlling biodecay of outdoor cultural heritage. Chlorophyll degradation to phaeopigments is used to test the biocidal efficacy of the antimicrobial agents. In the present study, the usefulness of color measurements in estimating chlorophyll degradation was investigated. An aeroterrestrial stone biofilm-forming cyanobacterium of the genus Nostoc was chosen as test organism, comparing its different behaviour in both planktonic and biofilm mode of growth against the isothiazoline biocide Biotin T®. Changes in A(435 nm)/A(415 nm) and A(665 nm)/A(665a nm) and in the chlorophyll a and adenosine triphosphate (ATP) cell content were compared with the variations in the CIELAB color parameters (L*, a*, b*, C*(ab) and h(ab)). Our findings showed that both the phaeophytination indexes are useful in describing degradation of chlorophyl a to phaeopigments. Moreover, the CIELAB color parameters represented an effective tool in describing chlorophyll degradation. L* CIELAB parameter appeared to be the most informative parameter in describing the biocidal activity of Biotin T® against Nostoc sp. in both planktonic and biofilm mode of growth.

journal_name

Biodegradation

journal_title

Biodegradation

authors

Sanmartín P,Villa F,Silva B,Cappitelli F,Prieto B

doi

10.1007/s10532-010-9402-8

subject

Has Abstract

pub_date

2011-07-01 00:00:00

pages

763-71

issue

4

eissn

0923-9820

issn

1572-9729

journal_volume

22

pub_type

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