Doctor of Philosophy (PhD)
First Advisor's Name
First Advisor's Committee Title
Second Advisor's Name
Second Advisor's Committee Title
Third Advisor's Name
Third Advisor's Committee Title
Fourth Advisor's Name
Fourth Advisor's Committee Title
Fifth Advisor's Name
Fifth Advisor's Committee Title
TOF-SIMS, Mass Spectrometry Imaging, Subcellular Chemical Mapping, Imaging, MSI
Date of Defense
Time-of-Flight Secondary Ion Mass Spectrometry (TOF-SIMS) is a powerful mass spectrometry imaging technique that is uniquely suited to the study of small and challenging biological samples. Mass spectrometry imaging permits the simultaneous detection of chemical species without a priori knowledge of a sample. In the present work, the use of endogenous chemical species, three-dimensional dual-beam depth profiling, and multi-modal mass spectrometry approaches are utilized to increase the specificity and reliability of sub-cellular chemical assignments. In addition, the use of these complimentary indicators serve as useful quality controls to ensure optimal preparation of samples for a high-vacuum environment. In the study of gunshot residue, the simultaneous detection of ‘characteristic’ inorganic and organic components using TOF-SIMS combined with secondary electron imaging from a particulate enabled confirmation of gunshot origin in a single analysis. The use of high spatial resolution TOF-SIMS imaging (~250 nm) permitted, for the first time, the localization and quantification of anti-tumor drug inside glioblastoma cells at therapeutic levels. The study of mosquito ovarian follicles from Aedes aegypti as a function of diet using 3D-TOF-SIMS imaging permitted, for the first time, the identification of endogenous molecular components within the oocyte, nurse cells, and follicular cells. When complemented with stable isotope labeling, 3D-TOF-SIMS allowed for the first time the mapping of de novo synthesized triacylglycerides as a function diet during the previtellogenic resting stage in mosquitoes; parallel studies using LC-TIMS-MS/MS permitted the identification and quantification of de novo synthesized triacylglycerides as a function of diet and time after eclosion. Lastly, a multi-modal, in situ imaging protocol is described for the first time capable of protein/small molecule characterization and localization of biomarkers associated with human acute wound healing.
Previously Published In
- A. Castellanos; C.E. Ramirez; V. Michalkova; M. Nouzova; F.G. Noriega; F. Fernandez-Lima, Three dimensional secondary ion mass spectrometry imaging (3D-SIMS) of Aedes aegypti ovarian follicles, J. Anal. At. Spectrom., 2019. DOI: 10.1039/c8ja00425k.
- Q. Vanbellingen; A. Castellanos; M. Rodriguez Silva; I. Paudel, J. Chambers; F. Fernandez-Lima, Analysis of Chemotherapeutic Drug Delivery at the Single Cell level using 3D-MSI-TOF-SIMS, JASMS 27, 2033-2040, 2016. DOI: 10.1007/s13361-016-1485-y
- A. Castellanos; S. Bell; F. Fernandez-Lima, Characterization of Firearms Discharge Residue Recovered from Skin Swabs using Sub-micrometric Mass Spectrometry Imaging, Anal. Methods 8, 4300-4305, 2016. DOI: 10.1039/c6ay00096g
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.0 License.
Castellanos, Anthony, "Topological Markers for Subcellular Chemical Mapping using TOF-SIMS" (2019). FIU Electronic Theses and Dissertations. 4337.
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).