2000
DOI: 10.1023/a:1009453228102
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Cited by 79 publications
(27 citation statements)
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“…Because molecular structures in H-PDA are different from that of eumelanin, excitation wavelengths in our case (290 nm to 370 nm) are unlike theirs. 65 MALDI-TOF mass spectrum of this supernatant also confirms the existence of mixed oligomers like trimers, tetramers and pentamers ( Figure S14). Since these small oligomers are soluble in water, the solid sediment after centrifugation may contain larger oligomers although the MALDI-TOF mass spectrum of H-PDA solid product presented only small oligomers ( Figure S10).…”
Section: Resultsmentioning
confidence: 66%
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“…Because molecular structures in H-PDA are different from that of eumelanin, excitation wavelengths in our case (290 nm to 370 nm) are unlike theirs. 65 MALDI-TOF mass spectrum of this supernatant also confirms the existence of mixed oligomers like trimers, tetramers and pentamers ( Figure S14). Since these small oligomers are soluble in water, the solid sediment after centrifugation may contain larger oligomers although the MALDI-TOF mass spectrum of H-PDA solid product presented only small oligomers ( Figure S10).…”
Section: Resultsmentioning
confidence: 66%
“…The supernatant of hydrothermal product shows an asymmetric emission peak at ~500 nm, which is similar with synthetic eumelanin and Sepia ink eumelanin. 65,66 However, carbon dots generated from hydrothermal of dopamine show emission wavelength from 380 to 530 nm. 53 The characteristic emission of H-PDA supernatant does not show "mirror image roles", which is due to the mixed chromophores in eumelanin-like solution ( Figure S13).…”
Section: Resultsmentioning
confidence: 99%
“…Fluorescence Measurements-The setup for TPEF spectroscopy has been described in detail previously (13,21). The 100-fs tuneable laser pulses had ϳ10 nm spectral width (full width at half maximum); excitation photon flux density was 10 28 cm Ϫ2 s Ϫ1 for measurements of the TPEF band shapes and between 2 ϫ 10 26 and 6 ϫ 10 28 cm Ϫ2 s Ϫ1 for measurement of intensity dependence of the TPEF signal.…”
Section: Methodsmentioning
confidence: 99%
“…Two-photon fluorescence and two-photon absorption microscopy of melanins has previously been studied and utilized in microscopic imaging. 29,30 However, no attempt was made to differentiate eumelanin from pheomelanin. With our highly sensitive twocolor transient absorption measurement, we are now able to distinguish them with different phase behaviors.…”
Section: Differentiating Eumelanin and Pheomelanin In Tissuementioning
confidence: 99%