Overall Characteristics of the Volatile Postprandial Serum Metabolome
In serum samples, a total of 8227 features were detected after
data pre-processing by untargeted DHS-VTT-GC–MS. In all, 808
features showed a significant postprandial response (ld.f1: Heatmap of 21 metabolites with significant postprandial response
and significant age or product effects. The fasting (zero) time point
is subtracted for each time point. Normalization to 1 was performed
with the highest absolute value of the metabolite. Clustering of metabolites
was conducted with hcluster (method = Euclidean, link = ward) The
labeling of each sample on the horizontal axis provides the age group
(YA: young adult, OA: older adult), product type (M: milk, Y: yogurt),
and postprandial time point (in minutes).