A highly sensitive and environmentally sustainable method was developed for the simultaneous determination of six volatile methylsiloxanes and seven synthetic musk fragrances in environmental water samples using headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-mass spectrometry (GC-MS). The method employs a novel metal-organic framework (MOF) coating, CIM-80(Al), deposited directly on nitinol wire supports without any polymer binder or adhesive. This design eliminates the risk of fiber contamination associated with conventional PDMS-based coatings, which can degrade during thermal desorption and release cyclic siloxanes such as D4—common interferences in methylsiloxane analysis. The MOF-based fiber demonstrated superior extraction efficiency, particularly for volatile analytes, due to its high surface area, tunable porosity, and adsorption-type mechanism. Optimization was conducted using a Box-Behnken experimental design, identifying optimal conditions: 20% (w/v) NaCl to enhance ionic strength, 40 minutes extraction time at 55 °C, and 10 minutes desorption at 270 °C. Under these conditions, the method achieved low limits of detection (LODs) ranging from 0.1 to 0.5 µg/L for methylsiloxanes and 1.2 to 3.5 µg/L for musk fragrances, with relative standard deviations below 17%, indicating excellent reproducibility. Calibration curves showed strong linearity (R² > 0.996) across wide concentration ranges, and matrix-matched calibration was applied to correct for matrix effects observed in wastewater and seawater samples. The absence of detectable background signals in blank analyses confirmed the absence of cross-contamination, a major advantage over commercial fibers.
Advantages of MOF-Coated SPME Fibers in Environmental Monitoring
The use of MOF-based coatings in SPME represents a significant advancement over traditional polymeric sorbents. Conventional SPME fibers, such as PDMS/DVB, rely heavily on PDMS matrices that are susceptible to thermal degradation and outgassing, especially under GC inlet conditions. This leads to false positives and unreliable quantification, particularly for volatile siloxanes. In contrast, the CIM-80(Al)-based fiber is entirely inorganic, thermally stable up to 320 °C, and does not contain any silicone components, making it ideal for analyzing methylsiloxanes without interference. Furthermore, the porous nature of MOFs allows for enhanced adsorption capacity and selectivity based on molecular size and polarity, enabling more efficient preconcentration of target analytes even at trace levels. The method’s green credentials are further reinforced by the elimination of organic solvents throughout the entire analytical workflow—from fiber preparation to sample extraction and cleanup—except for minimal acetone used in standard preparation and ethanol for cleaning.TGF β1 Antibody Purity This aligns with the principles of green chemistry and reduces environmental impact. Compared to alternative techniques like liquid-liquid extraction (LLE) or dispersive liquid-liquid microextraction (DLLME), which require toxic halogenated solvents, this approach offers comparable or better sensitivity while being significantly more sustainable.
Validation, Real Sample Analysis, and Implications for Environmental Risk Assessment
The method underwent comprehensive validation using both aqueous standards and real environmental samples.CK7 Antibody Epigenetics Precision studies revealed intra- and inter-day RSD values below 20% for all analytes, confirming robust performance.PMID:35144805 Relative recoveries ranged from 97.3% to 103% for the MOF fiber, compared to 92.1% to 94.5% for the PDMS/DVB fiber, highlighting improved accuracy. Matrix effect evaluation revealed significant suppression or enhancement depending on the compound and matrix type, necessitating matrix-matched calibration for reliable quantification. In wastewater samples, several musk fragrances were detected—DPMI, HHCB, AHTN—with concentrations reaching up to 46.9 µg/L, indicating persistent contamination from personal care product usage. L5 methylsiloxane was also detected above LOQ but outside the calibration range, suggesting potential hotspots requiring targeted monitoring. No analytes were detected in seawater samples, consistent with literature reports showing very low concentrations (pg/L level) of these compounds in marine environments. These findings underscore the importance of using highly sensitive, contamination-free methods for accurate environmental assessment. The proposed HS-SPME-GC-MS method not only provides a powerful tool for routine monitoring but also sets a new benchmark for sustainability and reliability in the analysis of emerging contaminants in aquatic systems, paving the way for future innovations in green analytical chemistry.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
