Sentence examples for authentic chemical from inspiring English sources

The datasets contain 108 primary metabolites with relative concentrations which were identified by authentic chemical standards.

Identification of known chemical entities was based on comparison with library entries of purified authentic chemical standards.

Identifications were regarded as definitive if the mass spectrum and retention index matched those of a metabolite present in the SHIMADZU GC-MS Metabolite Mass Spectra Database, which was prepared by analysis of authentic chemical standards on the instrument employed in this study.

Subsequent definitive identification employing at least two properties of sample-derived metabolite and an authentic chemical standard (typically RT and fragmentation mass spectrum) can then be performed.

Many studies do not compare experimental data to data acquired for authentic chemical standards, and therefore annotations and not identifications are achieved.

By contrast, level 2 and 3 annotation does not require matching to data for authentic chemical standards acquired within the same laboratory.

Or should we, in the name of emotional "authenticity", insist that emotions are authentic only when their chemical infrastructure is entirely endogenic?

It is immensely beneficial to track both the chemicals for which there are authentic standard spectra in the chemical library and the chemicals for which there are no current library entries.

Peaks 1 9 were identified as flavonoids by HPLC DAD ESI MSn by comparing the retention times and ESI MSn spectra with those of authentic standards, and the chemical structures of these flavonoids were shown in Fig. 4.

Description of the solvents, chemicals, and authentic standards used can be found in Supporting Information.

The Rf values of these bands were correlated by parallel running of authentic standards of these chemicals on TLC plates (Table  2).