Similarly, the HMBC correlations from Me-7′ to C-1′ (δ C 76.2), C-2′ (δ C 130.9), and C-6′ (δ C 33.7), as well as the substructure indicated by 1H 1H COSY spectrum and the molecular formula information, verified that the monoterpenoid moiety (α-phellandrene) and the β-triketone unit were connected via C-1 O C-1′ C-1 O C-1′6′ bonds.
The high-resolution/accurate mass measurements of the parent and product ions allow for selective identification of DNA adducts with minimal possibility of false positives while providing valuable molecular formula information.
These descriptors can be easily obtained from molecular formula and information acquired from periodic table in no time.
These structural candidates are generated using molecular formula and substructure information retrieved from MOLGEN-MS and MetFrag, and further characteristics (e.g., retention behavior).
The structures and identification information (chemical name, CAS registry number, molecular formula, molecular weight and information of references) of natural products contained in the medicinal herbs were retrieved from CHDD [26] and UNPD [5] which were both developed by our lab in recent years.
Rapidly improving high-resolution/accurate-mass LC MS hybrid orbital trap and TOF instrumentation provides an extremely powerful platform for DNA adductomic analysis, providing both accurate-mass measurements for molecular formula determination and fragmentation information for adduct structural identification utilizing data-dependent methodologies.
In silico fragmentation software such as Mass Frontier and MetFrag help users to understand fragmentation patterns with a top-down approach, while other mass spectra annotation software, such as SIRIUS, LipidInspector, LipidXplorer, mzGroupAnalyzer, ALEX, Metitere, and MZmine 2 use a bottom-up strategy to associate unknown spectra with molecular formulas or structure information.
Using this information and the molecular formula, the system generates isomers.
Thus, in ECFP0 fingerprints these substructures are just a count of the different atoms and the fingerprint has equivalent information to the molecular formula.
A molecular weight, molecular formula, mass spectrum (MS), user fragment information and/or starting material was provided for about 85, 68, 26, 7, and 5% of the challenges, respectively.
We proved that the information encrypted in molecular formula of ionic liquid could be a valuable source of knowledge regarding the IL's viscosity, n-octanol water partition-octanol watersolubility and enthalpartitionion.
