title: High wavenumber Raman spectroscopy in the characterization of urinary metabolites of normal subjects, oral premalignant and malignant patients.
abstract: Urine has emerged as one of the diagnostically potential bio fluids, as it has many metabolites. As the concentration and the physiochemical properties of the urinary metabolites may vary under pathological transformation, Raman spectroscopic characterization of urine has been exploited as a significant tool in identifying several diseased conditions, including cancers. In the present study, an attempt was made to study the high wavenumber (HWVN) Raman spectroscopic characterization of urine samples of normal subjects, oral premalignant and malignant patients. It is concluded that the urinary metabolites flavoproteins, tryptophan and phenylalanine are responsible for the observed spectral variations between the normal and abnormal groups. Principal component analysis-based linear discriminant analysis was carried out to verify the diagnostic potentiality of the present technique. The discriminant analysis performed across normal and oral premalignant subjects classifies 95.6% of the original and 94.9% of the cross-validated grouped cases correctly. In the second analysis performed across normal and oral malignant groups, the accuracy of the original and cross-validated grouped cases was 96.4% and 92.1% respectively. Similarly, the third analysis performed across three groups, normal, oral premalignant and malignant groups, classifies 93.3% and 91.2% of the original and cross-validated grouped cases correctly.
authors.affiliation: Department of Medical Physics, Anna University, Chennai, India.
authors.forename: Elumalai
authors.initials: E
authors.lastname: Brindha
authors.affiliation: Department of Medical Physics, Anna University, Chennai, India.
authors.forename: Ramu
authors.initials: R
authors.lastname: Rajasekaran
authors.affiliation: Department of Medical Physics, Anna University, Chennai, India. Electronic address: aruna@annauniv.edu.
authors.forename: Prakasarao
authors.initials: P
authors.lastname: Aruna
authors.affiliation: Department of Oral Medicine and Radiology, Meenakshi University, Chennai, India.
authors.forename: Dornadula
authors.initials: D
authors.lastname: Koteeswaran
authors.affiliation: Department of Medical Physics, Anna University, Chennai, India.
authors.forename: Singaravelu
authors.initials: S
authors.lastname: Ganesan
mesh_terms: D000328:Adult; D000368:Aged; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D008297:Male; D055442:Metabolome; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000378:metabolism* / Q000652:urine*; D011230:Precancerous Conditions / Q000378:metabolism* / Q000652:urine*; D012015:Reference Standards; D013059:Spectrum Analysis, Raman; D055815:Young Adult
keywords: Flavins; High wavenumber Raman spectroscopy; Oral premalignant; PC-LDA; Phenylalanine; Tryptophan; Urine