Page, Michelle K. published the artcileNew analytical method for quantifying flavoring chemicals of potential respiratory health risk concerns in e-cigarette liquids, Application In Synthesis of 14667-55-1, the main research area is electronic cigarette flavoring chems respiratory disease; E-cigarette refill solutions; E-liquids; e-cigarettes; electronic cigarettes; flavoring chemicals; flavorings; flavors; vaping (Min 5-Max 8).
Numerous flavoring chems. are added to e-cigarette liquids to create various flavors. Flavorings provide sensory experience to users and increase product appeal; however, concerns have been raised about their potential inhalation toxicity. Estimating potential health risk of inhaling these chems. has been challenging since little is known about their actual concentrations in e-cigarette products. To date, a limited number of anal. methods exist to measure the concentrations of flavoring chems. in e-cigarette products. We have developed an anal. method that accurately and precisely measures the concentrations of 20 flavoring chems. of potential inhalation risk concerns: 2,3,5-trimethylpyrazine, acetoin, benzaldehyde, benzyl alc., butanoic acid, dl-limonene, ethyl maltol, Et salicylate, Et vanillin, eucalyptol, eugenol, furaneol, isovanillin, l-menthol, maltol, Me salicylate, pulegone, trans-cinnamaldehyde, triacetin, and vanillin. Calibration and QC solutions were prepared in 50:50 propylene glycol (PG):vegetable glycerin (VG) and 5% H2O and flavoring concentrations ranging from 0.02 to 10.00 mg/mL. Samples of com. e-cigarette liquids, calibration and QC solutions were combined with 30μL of an internal standard mix (benzene-d6, pyridine-d5, chlorobenzene-d5, naphthalene-d8 and acenaphthene-d10; 1 mg/mL each) and were diluted 100-fold into methanol. Anal. was performed on an Agilent 7890B/7250 GC/Q-TOF using a DB-624UI column (30 m x 0.25 mmID x 1.4μm film thickness), with a total runtime of 13.5 min. Calibration curves were fit using a weighted quadratic model and correlations of determination (r2) values exceeded 0.990 for all chems. Bias and precision tests yielded values less than 20% and lower limits of quantitation (LLOQ) ranged from 0.02 to 0.63 mg/mL. Over 200 com. available products, purchased or collected from adult e-cigarette users and spanning a range of flavor categories, were evaluated with this method. Concentrations of pulegone, a suspected carcinogen, varied from below limit of quantitation (BLOQ) to 0.32 mg/mL, while acetoin and vanillin, known precursors to more cytotoxic byproducts, ranged from BLOQ to 1.52 mg/mL and from BLOQ to 16.22 mg/mL, resp. This method features a wide dynamic working range and allows for a rapid routine anal. of flavoring additives in com. e-cigarette liquids
Frontiers in Chemistry (Lausanne, Switzerland) published new progress about Beverages. 14667-55-1 belongs to class pyrazines, name is 2,3,5-Trimethylpyrazine, and the molecular formula is C7H10N2, Application In Synthesis of 14667-55-1.