ELECTROPHORESIS AND RAMAN SPECTROSCOPY CHARACTERIZATION OF INTEGRITY AND SECONDARY STRUCTURE OF p-SCN-Bn-DTPA- AND p-SCN-Bn-1B4M-DTPACONJUGATED TRASTUZUMAB
MARIJA STERJOVA 1,2*, PREDRAG DŽODIĆ 2, PETRE MAKRESKI 3, JELENA ŽIVKOVIĆ 4, EMILIJA JANEVIK-IVANOVSKA 1
1“Goce Delčev” University, Faculty of Medical Sciences, 10-А “Krste Misirkov” Street, 2000 Štip, Republic of Macedonia
2University of Niš, Faculty of Medicine, Department of Pharmacy, 81dr Zoran Đindić Street, 18000 Niš, Serbia
3Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University, 1000 Skopje,
Republic of Macedonia
4University of Niš, Faculty of Medicine, Department of Chemistry, , 81dr Zoran Đindić Street, 18000 Niš, Serbia
*corresponding author: marija.sterjova@ugd.edu.mk
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Abstract:
Trastuzumab is a humanized monoclonal antibody approved for treatment of HER2 (human epidermal growth factor 2)
positive breast cancer. Conjugation of trastuzumab offers a promising strategy of selective anticancer therapy. Trastuzumabemtansin
is a new generation of cytotoxic drug conjugated antibody with higher tumour selectivity and less toxicity of
emtansin. Conjugates of trastuzumab with bifunctional chelators (BFCs) for further radiolabelling are a step ahead in the field
of radiopharmacy for therapy and imaging of aggressive HER2 positive cancers. The purpose of this study is characterization
of integrity and secondary structure of antibody in already formulated lyophilized conjugates with p-SCN-Bn-DTPA- and p-
SCN-Bn-1B4M-DTPA- by applying SDS-PAGE electrophoresis and Raman spectroscopy. The results are positive and give
an opportunity for further radiolabelling of freeze dried conjugates.

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