Supporting Information Boronate-Modified Interdigitated Electrode Array for Selective Impedance-Based Sensing of Glycated Hemoglobin Yuwadee Boonyasit, †,‡ Wanida Laiwattanapaisal, § Orawon Chailapakul, # Jenny Emnéus, ‡ and Arto R. Heiskanen* ,‡,§ † Graduate Program in Clinical Biochemistry and Molecular Medicine, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand. ‡ Department of Micro- and Nanotechnology, Technical University of Denmark, Kgs. Lyngby, 2800, Denmark. § Department of Clinical Chemistry, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, 10330, Thailand. # Electrochemistry and Optical Spectroscopy Research Unit (EOSRU), Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand. *E-mail: arto.heiskanen@nanotech.dtu.dk Contents: Figure S1 pH dependence of boronate-HbA1c interaction Page S-2 Figure S2 Optimization of glutaraldehyde and APBA concentration Page S-3 Figure S3 Optimization of immobilization (APBA) and incubation (HbA1c) time Page S-4 Figure S4 Sensing surfaces without boronate modification Page S-5 Figure S5 Precision profile (RSE% vs. HbA1c concentration) Page S-6 Figure S6 HbAo interference Page S-7 Figure S7 Regression plot for method bias (HbA1c % vs. HbA1c concentration) Page S-8 Table S1 Analytical characteristics of electrochemical boronate-based HbA1c sensors Page S-9 Table S2 Equivalent circuit parameters Page S-10 Table S3 Regeneration efficiency Page S-11