ZHANG Ming-zhong,GUAN Peng-cheng,LIN Jia-sheng,et al.pH Sensing Based on Internal Standard Petal-like Gap-enhanced Raman Particles[J].Journal of Instrumental Analysis,2024,43(01):207-212.
ZHANG Ming-zhong,GUAN Peng-cheng,LIN Jia-sheng,et al.pH Sensing Based on Internal Standard Petal-like Gap-enhanced Raman Particles[J].Journal of Instrumental Analysis,2024,43(01):207-212. DOI: 10.12452/j.fxcsxb.23091402.
pH Sensing Based on Internal Standard Petal-like Gap-enhanced Raman Particles
This study describes a non-invasive,real-time analysis of pH levels in human sweat using surface-enhanced Raman scattering(SERS) technology. The researchers addressed issues such as poor stability caused by signal fluctuations by developing a novel sensor called the petal-like gap-enhanced Raman tag(PGERT). The sensor utilizes 4-mercaptobenzonitrile(4-MBN) molecules internally for an internal standard Raman signal and externally modifies the surface with 4-mercaptobenzoic acid(4-MBA) pH-sensing molecules to enhance the probe signal. Through in situ analysis,the study established standard analysis curves under pH conditions ranging from 5.0 to 8.0,achieving a high correlation coefficient(
r
2
) of up to 0.99. The sensor demonstrated high stability and sensitivity. Error rates between the sensor's detection results for sweat at different pH levels(pH 5.0 to 7.0) and standard pH meter measurements were(2.17±5.0)%,(4.62±1.1)%,(5.80±0.3)% and (3.68±1.0)%,respectively. These results indicate that the sensor,based on the internal standard PGERT,can be applied for monitoring pH levels in human sweat,offering advantages such as high sensitivity,stability,and precise analysis.