Florida International University
Colόn Crespo, Lauren J.
Determination of Human Scent Biomarkers for Race, Ethnicity and Gender.
Degree: PhD, Chemistry, 2016, Florida International University
Human scent has been the focal point of diverse scientific interests and research initiatives for the past several years. The knowledge gained about its composition has favored the advancement of multiple disciplines, and promoted the development of a wide variety of applications. Among these applications is the use of human scent as a resource for Forensic investigations, where scent profiles are often used as evidence to associate individuals to the scene of a crime. The characteristic nature of individual human scent has enabled this type of evidence to be used as a biometric tool for the differentiation of subjects. Nevertheless, the present study discusses a new perspective towards human scent's role and application in Forensic investigations. The foundation of this new perspective consists of employing human scent’s biometric quality to classify individuals using common traits.
In this research study, underarm and hand odor samples were collected from Caucasian, Hispanic and East Asian individuals, of both genders. Subjects were also organized into 3 different age groups: 18-30, 35-50 and 55+ years. Headspace Solid Phase Micro-extraction Gas Chromatography Mass Spectrometry (HS-SPME-GC-MS) was used to create individual scent profiles for the evaluation of subject classification by age, gender and race/ethnicity. Individual classification was assessed through the identification of qualitative and quantitative patterns in the volatile organic compound (VOC) constituents that characterize human scent. Principal Component and Linear Discriminant analyses of the collected scent profiles, led to the identification and validation of characteristic VOC marker combinations for age, gender and race/ethnicity. Statistical analysis facilitated group classification and differentiation on the basis of these traits. Moreover, this study also evaluated the use of solvent extraction as a complementary technique to HS-SPME for human scent analysis. Findings from this assessment revealed that the simultaneous consideration of data from both extraction techniques favors an enhancement of the classification of subjects by means of human scent.
The discoveries achieved in this study represent a significant step for human scent as a forensic tool. The outcome of this research has cleared a new path for further human scent investigation, and highlighted its further relevance to forensic applications.
Advisors/Committee Members: Kenneth G. Furton, Yong Cai, David Chatfield, Watson Lees, DeEtta Mills.
Subjects/Keywords: Forensic Chemistry; Human scent; Scent markers; Volatile organic compounds (VOCs); Underarm odor; Hand odor; Solid Phase Micro-extraction (SPME); Analytical Chemistry; Other Chemistry
to Zotero / EndNote / Reference
APA (6th Edition):
Colόn Crespo, L. J. (2016). Determination of Human Scent Biomarkers for Race, Ethnicity and Gender. (Doctoral Dissertation). Florida International University. Retrieved from https://digitalcommons.fiu.edu/etd/2442 ; 10.25148/etd.FIDC000281 ; FIDC000281
Chicago Manual of Style (16th Edition):
Colόn Crespo, Lauren J. “Determination of Human Scent Biomarkers for Race, Ethnicity and Gender.” 2016. Doctoral Dissertation, Florida International University. Accessed July 04, 2020.
https://digitalcommons.fiu.edu/etd/2442 ; 10.25148/etd.FIDC000281 ; FIDC000281.
MLA Handbook (7th Edition):
Colόn Crespo, Lauren J. “Determination of Human Scent Biomarkers for Race, Ethnicity and Gender.” 2016. Web. 04 Jul 2020.
Colόn Crespo LJ. Determination of Human Scent Biomarkers for Race, Ethnicity and Gender. [Internet] [Doctoral dissertation]. Florida International University; 2016. [cited 2020 Jul 04].
Available from: https://digitalcommons.fiu.edu/etd/2442 ; 10.25148/etd.FIDC000281 ; FIDC000281.
Council of Science Editors:
Colόn Crespo LJ. Determination of Human Scent Biomarkers for Race, Ethnicity and Gender. [Doctoral Dissertation]. Florida International University; 2016. Available from: https://digitalcommons.fiu.edu/etd/2442 ; 10.25148/etd.FIDC000281 ; FIDC000281