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The variation in the fluorescence lifetime and amplitude of the various conformers of L-tryptophan and of NATA is completely governed by the concentration of the amides in solution such that the microenvironment surrounding the fluorophores are completely reorganised. The hydrogen-bonding functional groups in amides that are responsible for the coexistence of rotamers are elucidated and well supported by quantum mechanical (QM) studies. Time-correlated single-photon counting(TCSPC) technique is used as a probe as well as marker in estab