GGeeoorrggiiaa SSttaattee UUnniivveerrssiittyy SScchhoollaarrWWoorrkkss @@ GGeeoorrggiiaa SSttaattee UUnniivveerrssiittyy Chemistry Theses Department of Chemistry 4-29-2010 SSttuuddyy ooff CCyyaanniinnee DDyyee BBiinnddiinngg ttoo AAmmiinnoo AAcciiddss aanndd IIttss AAnnaallyyttiiccaall UUttiilliittyy Yonathan Merid Georgia State University, [email protected] Follow this and additional works at: https://scholarworks.gsu.edu/chemistry_theses RReeccoommmmeennddeedd CCiittaattiioonn Merid, Yonathan, "Study of Cyanine Dye Binding to Amino Acids and Its Analytical Utility." Thesis, Georgia State University, 2010. doi: https://doi.org/10.57709/1331375 This Thesis is brought to you for free and open access by the Department of Chemistry at ScholarWorks @ Georgia State University. It has been accepted for inclusion in Chemistry Theses by an authorized administrator of ScholarWorks @ Georgia State University. For more information, please contact [email protected]. STUDY OF CYANINE DYE BINDING TO AMINO ACIDS AND ITS ANALYTICAL UTILITY by YONATHAN MERID Under the Direction of Gabor Patonay ABSTRACT Investigation of the NIR cyanine dye MHI‐36 shows binding affinity to charged amino acids. This cyanine dye showed aggregation and dimerformation at higher dye concentration (2.0x10‐3M) induced by lysine. When dye concentration decreased to 1.0x10‐4M no strong aggregate formation was viewed. Dye shows strong binding and selectivity properties towards charged amino acids lysine and arginine, compared to neutral leucine. It’s believed the positively charged presence was able to break and disrupt the conjugated π‐ π bonds at lower dye concentration. Computational work showed intramolecular aggregation of the phenyl groups on the dye. These aggregates are believed to create electron rich environment suitable for lysine interaction. INDEX WORDS: Aggregation, Near infrared, Protein labeling, Quenching STUDY OF CYANINE DYE BINDING TO AMINO ACIDS AND ITS ANALYTICAL UTILITY by YONATHAN MERID A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of Masters of Science In the College of Arts and Sciences Georgia State University 2010 Copyright by Yonathan Merid 2010 STUDY OF CYANINE DYE BINDING TO AMINO ACIDS AND ITS ANALYTICAL UTILITY by YONATHAN MERID Committee Chair: Gabor Patonay Committee: Gabor Patonay Gangli Wang G. DavonKennedy Electronic Version Approved: Office of Graduate Studies College of Arts and Sciences Georgia State University May 2010 iv DEDICATION I would like to dedicate this work too my father, mother and sister. Thank you for your support. v ACKNOWLEDGEMENTS Even though this seems like a personal achievement I believe anyone that has been in contact with me the past two years has played some part in this accomplishment. First and foremost I would like to thank God because he provided the strength I needed to reach my mountain top. My supportive and loving parents who believed in me. My out of town sister (lol), who has helped me understand the importance of education and to the rest of my family, all my Uncles, Aunts, cousins, and friends who have encouraged me more than they know. Dr. Patonay, thank you for providing more questions than answers. The freedom and flexibility you provided me helped me understand how to be a true scientist. Garfield, all the numerous conversation we had, majority non‐chemistry related. Sang Hooh Kim, Kristen Ashbey and other members of Patonay group. The rest of chemistry students I have met along the way. Dr. Jenny Yang, Dr. Wang, Dr. Ritu and all the other professors that I have had the pleasure of attending their class. vi TABLE OF CONTENTS ACKNOWLEDGEMENTS v LISTOFFIGURES viii CHAPTER 1. INTRODUCTION 1 1.1 NIR Energy 1 1.2 Dye Aggregation 2 1.3 Protein Labeling 3 1.4 Human Serum Albumin 4 1.5 NIR Fluorescent Probe 6 1.6 Cyanine Dye 8 2. INSTRUMENTATION 10 3. EXPERIMENTAL 10 4. RESULTS 10 vii 4.1 Concentration Difference with MHI 10 4.2 Selectivity of Amino Acid in Solution 16 4.3 Effect of Positive Charge and Job Plot 20 4.4 Peak Ratio and Aggregate Formation 23 4.5 Computational Derived Intramolecular Aggregate 27 5. CONCULSION 32 6. REFERENCES 35 viii LIST OF FIGURES Figure 1.1 MHI‐36 Dye. Two Phenol Groups attached to the propyl group 9 Figure 4.1 Absorption Spectrum 2.0x10‐3M Concentration MHI‐36 Dye with 11 Arginine, at increasing Concentration in pH 7.2 Phosphate Buffer. Arginine concentration is at 1x10‐4mM. Figure 4.2Absorption Spectrum 2.0x10‐3M Concentration MHI‐36 Dye with 12 Arginine in pH 7.2 Phosphate Buffer. Arginine concentration is at 1x10‐4mM. Figure 4.3Absorption Spectrum comparison 2.0x10‐3M Concentration MHI‐ 12 36 Dye with Arginine, Leucine and Lysine at 50mM Concentration in pH 7.2 Phosphate Buffer. Amino Acid concentration is at 1x10‐4mM. Figure 4.4Absorption Spectrum comparison 2.0x10‐3M Concentration MHI‐ 13 36 Dye with Arginine, Leucine and Lysine at 300mM Concentration in pH 7.2 Phosphate Buffer. Amino Acid concentration is at 1x10‐4mM. Figure 4.5Absorption Spectrum 2.0x10‐3 M Concentration MHI‐36 Dye with 14 Salt (Sodium Acetate), Lysine and Valeric Acid at 50mM Concentration in pH 7.2 Phosphate Buffer. Lysine, Valeric Acid and Salt concentration 1x10‐4M. Figure 4.6Absorption Spectrum 2.0x10‐3M Concentration MHI‐36 Dye with 14 Salt (Sodium Acetate), Lysine and Valeric Acid at 300mM Concentration in pH 7.2 Phosphate Buffer. Lysine, Valeric Acid and Salt concentration 1x10‐4M.
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