本研究團隊近年來已成功使用手持式原型機檢測出多種心血管疾病蛋白質生物指標。急性心肌梗塞最重要的蛋白質生物指標之一為心肌肌鈣蛋白-I (cTnI)。然而，若要成功發展可即時診斷之cTnI感測器，讓病患得以長期且經常性地進行追蹤心血管疾病，檢測儀器必須要具有良好的靈敏度、穩定度及再現性。
本研究中，在不改變電路與晶片設計的情況下，先藉由調整金氧半場效電晶體的閘極電壓和汲極電壓，來了解此感測器之穩定度機制。此外，不同的抗體濃度之蛋白質標的物檢測，對感測器的靈敏度及解析度有所影響。因此採用三種不同濃度的cTnI抗體進行檢測。最後比較4%BSA、血清及全血環境下的cTnI檢測結果。本實驗成果可作為將來優化手持式生醫感測器重要的依據。

In recent years, our research team has successfully detected a variety of protein biomarkers for cardiovascular diseases (CVDs). One of the most important protein biomarkers for myocardial infarction in the blood is cardiac troponin I (cTnI). However, the final goal of development of the cTnI FET sensor should allow patients to track CVDs regularly. Therefore, the device must have better sensitivity, stability and reproducibility. In this study, without changing the design of the circuit and chip, the control of voltage condition and antibody concentration were applied to confirm the stability mechanism of the cTnI FET sensor. The stability was defined by the standard deviation (SD) of source-drain current. From the results, the gm was found as an important factor for determining the SD and sensitivity. The comparison results of 4%BSA, serum and whole blood could prove the ability of the sensor. The results of this experiment can be used as an significant basis for optimizing hand-held biomedical sensors in the future.

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