Abstract BackgroundGastric cancer is as the gastrointestinal issue, the second most death-cause complication worldwide. The survival rate of gastric cancer is lesser due to diagnosing it at the advanced stage. SRY-box containing gene 17 (SOX-17) expression and methylation participate a crucial role in the gastric cancer. MethodsIn this research, capture probe modified interdigitated electrode was used to quantify the SOX-17 gene target sequence. To improve the detection, IDE sensing surface was physically-modified by silica-alumina (Si-Al) nanocomposite. Through the biotin-streptavidin strategy, capture probe was immobilized on the surface and complemented by the target sequence. ResultsDoubled the level of capture probe immobilization was noticed on the Si-Al modified surface. From 1 aM concentration of target sequence was detected in the presence of Si-Al nanocomposite, while it was reached 10 aM in the absence, shows ten-folds difference. In addition, higher level of current changes was registered with all the concentrations of target sequence. Control experiments with single, triple and complementary sequences of target were done and there is no significant changes in current were recorded in the substituted sequences, representing the specific detection of target SOX-17 gene sequence. ConclusionThe detection method is shown with nanocomposite-modified IDE surface helps to recognize the gastric cancer effectively.