Abstract
Hair and nails are human biomarkers capable of providing a continuous assessment of the concentrations of elements inside the human body to indicate the nutritional status, metabolic changes, and the pathogenesis of various human diseases. Laser-induced breakdown spectroscopy (LIBS) and X-ray fluorescence (XRF) spectrometry are robust and multi-element analytical techniques able to analyze biological samples of various kinds for disease diagnosis. The primary objective of this review article is to focus on the major developments and advances in LIBS and XRF for the elemental analysis of hair and nails over the last 10-year period. The developments in the qualitative and quantitative analyses of human hair and nail samples are discussed in detail, with special emphasis on the key aspects of elemental imaging and distribution of essential and non-essential elements within the hair and nail tissue samples. Microchemical imaging applications by LIBS and XRF (including micro-XRF and scanning electron microscopy, SEM) are also presented for healthy as well as diseased tissue hair and nail samples in the context of disease diagnosis. In addition, main challenges, prospects, and complementarities of LIBS and XRF toward analyzing human hair and nails for disease diagnosis are also thoroughly discussed here.
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Authors Varun Bali, Yugal Khajuria, and Vivek K. Singh are thankful to Shri Mata Vaishno Devi University, Katra, India, for necessary support to carry out this research work.
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Bali, V., Khajuria, Y., Maniyar, V. et al. Quantitative analysis of human hairs and nails. Biophys Rev 15, 401–417 (2023). https://doi.org/10.1007/s12551-023-01069-2
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DOI: https://doi.org/10.1007/s12551-023-01069-2