Hospitalised children with COVID-19 display a shift in faecal compounds related with the metabolism of vitamins and lipids

The SARS-CoV-2 virus and its rapid spread have made it a global health concern. We investigated the metabolic faecal profiles of paediatric patients hospitalised for COVID-19. The study included 16 patients (aged 4 to 14 years old) from six different Spanish hospitals and 20 age-matched healthy controls. The metabolic profile was analysed by liquid chromatography high resolution mass spectrometry, observing different metabolic profile  between the two groups. Non-infected children had higher faecal levels of vitamins such as niacin, thiamine, and vitamin D3 derivatives. This datasets contains the raw data from untargeted metabolomics analysis in mzML. A 1290 Infinity II LC system (Agilent Technologies, California USA) coupled to an Agilent 6560B ion mobility quadrupole time-of-flight mass spectrometer (IM-QTOF MS/MS) equipped with an Agilent G1607A dual Jetstream orthogonal electrospray ionisation (ESI) source and the MassHunter WorkStation 11.0, was used operating in positive and negative ion modes in the 50-1000 m/z range. Chromatographic separations were performed on a Zorbax Eclipse plus C18 RR HD column (30x50 mm 1.8 µm, Agilent) at a temperature of 40 ºC and a flow rate of 0.3 ml/min. In positive ion mode, the optimised mobile phases consisted of MilliQ water containing 0.04% formic acid (phase A) and methanol containing 0.04% formic acid (phase B), while in negative ion mode they consisted of water containing 10 mM ammonium formate (Sigma, phase A) and 100% methanol (phase B). The optimised gradient with QCs was set as follows: 5% B for 0.5 min; 5 to 100% B over 0.5 to 8 min; 100% for 8 to 12 min; 100 to 5% B over 12 to 13 min, re-equilibrating the column for 3 min using the initial solvent composition.