1D/2D NMR 1 1D/2D NMR experiments 1 Alkylation 1 Arecaceae 1 Article 1 Characterization 1 ESI-MS/MS 1 Hydrolysis 1 Lactobacillus reuteri 1 Lactobacillus salivarius 1 Mannanoligosaccharides 1 Mannans 1 Mannose 1 Methylation 1 Nuclear magnetic resonance spectroscopy 1 Oligomers 1 Palm kernel cake 1 Palm oil 1 Prebiotic activity Prebiotics 1 Strain 1 Tandem Mass Spectrometry 1 acetic acid 1 aqueous solution 1 butyric acid 1 carbohydrate analysis 1 carbon nuclear magnetic resonance 1 chemistry 1 electrospray mass spectrometry 1 high temperature 1