Abstract:This paper presents an evaluation of time-resolved fluorescence measurements on human skin for screening type 2 diabetes. In-vivo human skin was excited with a pulse diode at 375 nm and pulse width of 700 ps. Fluorescence decays were recorded at four different emission wavelengths 442, 460, 478 and 496 nm. Experiments were performed on various locations including the palms, arms, legs, and cheeks of a healthy Caucasian subject to test single-subject variability. The fluorescence decays obtained were modeled us… Show more
“…An interesting feature of fluorescence (and Raman spectroscopy, see Section 3.2.10) is that these measurements can be performed in a noninvasive manner. For example, the AGE-related fluorescence of skin and the eye lens have been measured [132][133][134][135][136]. Interestingly, AGE-related fluorescence of the human skin has been correlated with vascular complications [137], renal function [132,138,139], diabetes [140], obesity [141], and even mental disorders [142].…”
“…An interesting feature of fluorescence (and Raman spectroscopy, see Section 3.2.10) is that these measurements can be performed in a noninvasive manner. For example, the AGE-related fluorescence of skin and the eye lens have been measured [132][133][134][135][136]. Interestingly, AGE-related fluorescence of the human skin has been correlated with vascular complications [137], renal function [132,138,139], diabetes [140], obesity [141], and even mental disorders [142].…”
“…In addition, Rajaram et al studied non-melanoma skin cancer in vivo using a combination of diffuse reflectance and fluorescence spectroscopy [33], while Blackwell et al used an instrument recording fluorescence decays in four spectral channels to compare the fluorescence signature of human skin from diabetic and non-diabetic test subjects in vivo [44].…”
Journal of BIOPHOTONICSWe present a clinical investigation of diffuse reflectance and time-resolved autofluorescence spectra of skin cancer with an emphasis on basal cell carcinoma. A total of 25 patients were measured using a compact steady-state diffuse reflectance/fluorescence spectrometer and a fibre-optic-coupled multispectral time-resolved spectrofluorometer. Measurements were performed in vivo prior to surgical excision of the investigated region. Singular value decomposition was used to reduce the dimensionality of steady state diffuse reflectance and fluorescence spectra. Linear discriminant analysis was then applied to the measurements of basal cell carcinomas (BCCs) and used to predict the tissue disease state with a leave-one-out methodology. This approach was able to correctly diagnose 87% of the BCCs. With 445 nm excitation a decrease in the spectrally averaged fluorescence lifetime was observed between normal tissue and BCC lesions with a mean value of 886 ps. Furthermore, the fluorescence lifetime for BCCs was lower than that of the surrounding healthy tissue in all cases and statistical analysis of the data revealed that this decrease was significant (p ¼ 0.002).Schematic diagrams of the two spectrometers showing the steady state spectrometer measurement head (top) and the optical layout of the time-resolved system (bottom).
“…However, there have been few reports on the applicability of FLM to examination of AGEs in vivo. For example, Blackwell et al used FLM on the human skin for diagnosis of diabetes, and showed non-significant difference between the fluorescence lifetimes of nondiabetic and diabetic subjects [21]. Thus, the relationship between fluorescence lifetime and degree of glycation remains ambiguous.…”
Advanced Glycation End-products (AGEs) are produced by the Maillard reaction, which causes cross-linking of collagen and results in changes in the mechanical properties of collagen tissues. Several types of AGE fluoresce, and measurement of this fluorescence is effective for determining the presence of AGEs. Because fluorescence intensity by steady-state fluorometry is affected by sample surface condition and light source, we focused on fluorescence lifetime measurement (FLM). We found that fluorescence lifetime of collagen gel decreased with glycation progress. In vivo application of FLM for determination of AGEs was confirmed in human dentin. 309-318 (1999 248-254 (1976). 14. R. Longin, "New method of collagen extraction for radiocarbon dating," Nature 230(5291), 241-242 (1971). 15. J. Meng, N. Sakata, Y. Imanaga, S. Takebayashi, R. Nagai, and S. Horiuchi, "Carboxymethyllysine in dermal tissues of diabetic and nondiabetic patients with chronic renal failure: relevance to glycoxidation damage," Nephron 88(1), 30-35 (2001). 16. U. K. Laemmli, "Cleavage of structural proteins during the assembly of the head of bacteriophage T4," Nature 227(5259), 680-685 (1970). 17. M. Laurière, "A semidry electroblotting system efficiently transfers both high-and low-molecular-weight proteins separated by SDS-PAGE," Anal. Biochem. 212(1), 206-211 (1993). 18. G. K. Reddy and C. S. Enwemeka, "A simplified method for the analysis of hydroxyproline in biological tissues,"Clin. Biochem. 29(3), 225-229 (1996). Eur.
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