Abstract
This study focuses on preparation and valuation of the biodegradable, native, and modified gelatin film as screen-printing substrates. Modified gelatin film was prepared by crosslinking with various crosslinking agents and the electrode array was designed by screen-printing. It was observed that the swelling ratio of C-2, crosslinked with glutaraldehyde and EDC/NHS (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide) was found to be lower (3.98%) than that of C-1 (crosslinked with only glutaraldehyde) (8.77%) and C-0 (without crosslinking) (28.15%). The obtained results indicate that the swelling ratios of both C-1 and C-2 were found to be lower than that of C-0 (control one without crosslinking). The Young’s modulus for C-1 and C-2 was found to be 8.55 ± 0.57 and 23.72 ± 2.04 kPa, respectively. Hence, it was conveyed that the mechanical strength of C-2 was found to be two times higher than that of C-l, suggesting that the mechanical strength was enhanced upon dual crosslinking in this study also. The adhesion study indicates that silver ink adhesion on the gelation surface is better than that of carbon ink. In addition, the electrical response of C-2 with a screen-printed electrode (SPE) was found to be the same as the commercial polycarbonate (PC) substrate. The result of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay suggested that the silver SPE on C-2 was non-cytotoxic toward L929 fibroblast cells proliferation. The results indicated that C-2 gelatin is a promising material to act as a screen-printing substrate with excellent biodegradable and biocompatible properties.
Highlights
In order to study the electrical activity of biological cells, electrode arrays can provide useful information
The optical photographs showed that the crosslinked gelatin films became yellow, suggesting the formation of a successful crosslinking structure
This indicates that the crosslinking could effectively increase the compactness of the gelatin film [28], and such a smooth and compact gelatin surface is appropriate for screen-printing
Summary
In order to study the electrical activity of biological cells, electrode arrays can provide useful information. Numerous studies have been carried out to construct electrode arrays on flexible substrates such as polyimide [6], parylene [7], and polydimethylsiloxane (PDMS) [8]. In order to meet the requirements for specific applications in the biological field, several researchers significantly studied the surface modification of PDMS with bioactive molecules [12,13,14]. The potential application of natural bioactive molecules such as gelatin and natural polymers was studied as an alternate direct substrate and the studies indicated that they could facilitate enhancing the degradation and biocompatibility of cells
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