化学传感器
化學傳感器
화학전감기
CHEMICAL SENSORS
2014年
1期
37-43
,共7页
植酸胶束%金纳米粒子%辣根过氧化酶%过氧化氢传感器
植痠膠束%金納米粒子%辣根過氧化酶%過氧化氫傳感器
식산효속%금납미입자%랄근과양화매%과양화경전감기
IP6 micelles%gold nanoparticles%horseradish peroxidase%hydrogen peroxide sensor
采用混合组装技术,利用植酸胶束(IP6 micelles)的磷酸酯键络合辣根过氧化物酶(HRP)和金纳米粒子(GNPs),形成了具有生物亲和性的纳米复合材料,保持了辣根过氧化物酶的生物活性,并利用金纳米粒子的高电子密度、介电特性和催化性能,实现了HRP与玻碳电极(GCE)表面的直接电子转移。 Nafion膜的滴加能提高电极的选择性和稳定性。实验过程中借助紫外-可见吸收光谱和透射电子显微镜进行表征,实验结果证明:GNPs的高导电和高催化性能,结合植酸胶束的优良生物相容性和对酶的高负载量的特点,使得吸附在其上的HRP保持活性,制备的生物传感器能对H2O2进行电催化还原。 Nafion/HRP-IP6 micelles-GNPs/GCE对H2O2的线性浓度范围为5×10-7~1.15×10-5 mol/L (线性相关系数r=0.993, n=9),最低检测限为0.1μmol/L (信噪比S/N=3),米氏常数为0.0024 mmol/L。
採用混閤組裝技術,利用植痠膠束(IP6 micelles)的燐痠酯鍵絡閤辣根過氧化物酶(HRP)和金納米粒子(GNPs),形成瞭具有生物親和性的納米複閤材料,保持瞭辣根過氧化物酶的生物活性,併利用金納米粒子的高電子密度、介電特性和催化性能,實現瞭HRP與玻碳電極(GCE)錶麵的直接電子轉移。 Nafion膜的滴加能提高電極的選擇性和穩定性。實驗過程中藉助紫外-可見吸收光譜和透射電子顯微鏡進行錶徵,實驗結果證明:GNPs的高導電和高催化性能,結閤植痠膠束的優良生物相容性和對酶的高負載量的特點,使得吸附在其上的HRP保持活性,製備的生物傳感器能對H2O2進行電催化還原。 Nafion/HRP-IP6 micelles-GNPs/GCE對H2O2的線性濃度範圍為5×10-7~1.15×10-5 mol/L (線性相關繫數r=0.993, n=9),最低檢測限為0.1μmol/L (信譟比S/N=3),米氏常數為0.0024 mmol/L。
채용혼합조장기술,이용식산효속(IP6 micelles)적린산지건락합랄근과양화물매(HRP)화금납미입자(GNPs),형성료구유생물친화성적납미복합재료,보지료랄근과양화물매적생물활성,병이용금납미입자적고전자밀도、개전특성화최화성능,실현료HRP여파탄전겁(GCE)표면적직접전자전이。 Nafion막적적가능제고전겁적선택성화은정성。실험과정중차조자외-가견흡수광보화투사전자현미경진행표정,실험결과증명:GNPs적고도전화고최화성능,결합식산효속적우량생물상용성화대매적고부재량적특점,사득흡부재기상적HRP보지활성,제비적생물전감기능대H2O2진행전최화환원。 Nafion/HRP-IP6 micelles-GNPs/GCE대H2O2적선성농도범위위5×10-7~1.15×10-5 mol/L (선성상관계수r=0.993, n=9),최저검측한위0.1μmol/L (신조비S/N=3),미씨상수위0.0024 mmol/L。
A hybrid and bio-compatible sensor constructed with IP6 micelles phosphate bonded horseradish peroxidase and gold nanoparticles. The nano-composite materials not only keep the biological activity of horseradish peroxidase, but also achieve the high electron density, dielectric properties and catalytic performance of gold nanoparticles to facilitate the direct electron transfer. Furthermore, Nafion membrane can improve the selectivity and stability of sensor. The characterizations of UV -visible absorption spectroscopy and transmission electron microscopy showed that the high conductivity and high catalytic properties of nanoparticles together with the excellent biocompatibility and high enzyme loading IP6 micelles made the adsorption of HRP and maintained its activity. Nafion/HRP-IP6 micelles-GNPs/GCE biosensor can electrocatalytically reduce H2O2. The current response with the concentration of H2O2 has a linear relationship within the concentration range of 5×10-7~1.15×10-5 mol/L (linear correlation coefficient r=0.993, n=9), the detection limit was 0.1μmol/L (signal to noise ratio S/N=3), Michaelis constant of 0.002 4 mmol/L.