- - - Reviewer's Comment #23: A comment: The need for working in the UV makes the probe prone to interferences by biomatter. Blood, serum, cells, marine water, wastewaters etc. always display strong background UV absorption and fluorescence. The UV light used for fluorescence excitation will be screened off by UV absorbers and this will weaken the signal. The same is true for emitted UV fluorescence which will be screened off. This limitation should be addressed at the end of the discussion

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