System version: 1.9.0
Data update (any time)
2022/07/23: 734 samples are available.
Number of Peaks
|ESI Positive||ESI Negative||All|
|Total peak number||5,243,731||3,656,502||8,900,233|
|Average peak number (per published food items)||7,144||4,982||6,063|
|Peaks with MS/MS spectra||352,242||239,035||591,277|
|Peaks with compound database hits
(KEGG, KNApSAcK, HMDB, LIPID MAPS, FlavonoidDB were searched with a 20 ppm-mass tolerance)
|2022/07/23||The column was replaced with a new one. The new column (2nd generation) was used for the samples whose IDs start with 226 or later.|
The coverage of MS/MS spectra was improved to approximately 7% by changing the parameters of PowerGetBatch software. Specifically, the mass tolerance for identifying the precursor ion was changed from 0.05 Da to 0.1 Da. As a result, the MS/MS spectra that have been dropped during this step are properly assigned now.
The new data were added, and 734 samples are available.
|2022/06/25||The coverage of MS/MS spectra was improved by changing the parameters of
Specifically, the threshold value of the peak intensity for the best MS/MS
spectral selection in the peak detection was changed to zero,
and the threshold value in the peak alignment was changed to 100 from the previous value of 500.|
The new data were added, and 630 samples are available now.
|2022/04/18||The system was updated to 1.9.0 with improvements below.
|2022/03/05||A list of the standard compounds analyzed was added.
The data from barley samples from NBRP were replaced with a recalculated ones
because previous data might exclude many peaks due to carry over in mock data.
Be careful that the peak IDs were reassigned for this modification.
Data from 535 samples are available.
|2021/08/23||The MassChroBook is now available. 172 samples are available.|
|2021/08/15||All data were updated. 128 samples are available. A fluctuation of retention time was observed in the previous data. There was also room for improvement of the MS/MS conditions. These two were reviewed and all samples were reanalyzed. A data was added.|
|2021/07/05||The system was updated to 1.5.4 with a minor fix of internal link. In total 111 samples are available.|
|2021/06/22||Most of the contents except detailed sample metadata and download files were prepared.|
|2021/06/07||The draft version was released.|