A multi-location peak parking approach for calculation of second dimensional retention indices for improved volatile compound identification with cryogen-free comprehensive heart-cut two-dimensional gas chromatography was written by Janta, Pannipa;Pinyo, Duangkamol;Yodta, Yamonporn;Vasasiri, Porames;Weidenbach, Meinolf;Pursch, Matthias;Yang, Xiuhan;Kulsing, Chadin. And the article was included in Analytical Methods in 2021.Category: alcohols-buliding-blocks The following contents are mentioned in the article:
Comprehensive heart-cut multidimensional gas chromatog. (CH/C MDGC) without a cryogenic trapping device was developed with an established approach for calculation of first and second dimensional retention indexes (1I and 2I) for improved compound identification. A first dimensional (1D) DB-1MS column (60 m) and a second dimensional (2D) DB-WAX column (60 m) were applied with a Deans switch (DS) using a constant H/C window of 0.2 min and a periodic multiple heartcut strategy comprising 225H/C throughout the CH/C. 1I was calculated based on comparison of the middle of the heartcut time with the alkane retention times on the 1D column. A multi-location peak parking approach using sixteen sets of automated injections of alkane references was also established with the least square curve fitting method for construction of the alkane isovolatility curves which were applied for 2I calculation The untargeted compound anal. of a perfume sample was then performed according to comparison with the libraries of mass spectra, 1I and 2I. The CH/C MDGC system with a 25 h anal. time showed a peak capacity (nc) of 9198 and 128 separated peaks with 71 compounds successfully identified according to MS, 1I and 2I library match under the established error approximation criteria. Furthermore, relationship between the anal. time and number of separated peaks was proposed based on the set of 84 identifiable compounds With the compensation of lower separation performance and greater I errors, the anal. time could be reduced by applying a 2.5 min H/C window with a total anal. time of 2 h and nc of 1134. This study involved multiple reactions and reactants, such as 3,7-Dimethyloctan-1-ol (cas: 106-21-8Category: alcohols-buliding-blocks).
3,7-Dimethyloctan-1-ol (cas: 106-21-8) belongs to alcohols. A strong base can deprotonate an alcohol to yield an alkoxide ion (R―O−). For example, sodamide (NaNH2), a very strong base, abstracts the hydrogen atom of an alcohol. The most common reactions of alcohols can be classified as oxidation, dehydration, substitution, esterification, and reactions of alkoxides.Category: alcohols-buliding-blocks
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts