Laboratory of Biopolymer and Derivatives, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
PLoS One. 2011;6(9):e24578. doi: 10.1371/journal.pone.0024578. Epub 2011 Sep 9.
A new sensing area for a sensor based on surface plasmon resonance (SPR) was fabricated to detect trace amounts of mercury and lead ions. The gold surface used for SPR measurements were modified with polypyrrole-chitosan (PPy-CHI) conducting polymer composite. The polymer layer was deposited on the gold surface by electrodeposition. This optical sensor was used for monitoring toxic metal ions with and without sensitivity enhancement by chitosan in water samples. The higher amounts of resonance angle unit (ΔRU) were obtained for PPy-CHI film due to a specific binding of chitosan with Pb(2+) and Hg(2+) ions. The Pb(2+) ion bind to the polymer films most strongly, and the sensor was more sensitive to Pb(2+) compared to Hg(2+). The concentrations of ions in the parts per million range produced the changes in the SPR angle minimum in the region of 0.03 to 0.07. Data analysis was done by Matlab software using Fresnel formula for multilayer system.
一个新的基于表面等离子体共振（SPR）的传感器的传感区域被制造出来，用于检测痕量的汞和铅离子。用于 SPR 测量的金表面用聚吡咯-壳聚糖（PPy-CHI）导电聚合物复合材料进行了修饰。聚合物层通过电沉积沉积在金表面上。这种光学传感器用于在水样中监测有毒金属离子，同时通过壳聚糖增强其灵敏度。由于壳聚糖与 Pb(2+)和 Hg(2+)离子的特异性结合，PPy-CHI 薄膜获得了更高的共振角度单位（ΔRU）。Pb(2+)离子与聚合物薄膜结合最强，与 Hg(2+)相比，传感器对 Pb(2+)更敏感。百万分之几浓度的离子在 0.03 到 0.07 区域产生了 SPR 角度的最小变化。数据分析通过 Matlab 软件使用多层系统的菲涅耳公式进行。
