title: Solid-state (13)C CP MAS NMR spectroscopy of mushrooms gives directly the ratio between proteins and polysaccharides.
abstract: The solid-state (13)C CP MAS NMR technique has the potential of monitoring the chemical composition in the solid state of an intact food sample. This property has been utilized to study mushrooms of different species (Pleurotus ostreatus, Pleurotus eryngii, Pleurotus pulmunarius, and Lentinula edodes), already characterized by chemical analyses for protein and dietary fiber components. Solid-state (13)C CP MAS NMR spectroscopy reveals a large difference in the ratio between the glucidic and the proteic resonances probably depending on the mushroom species. An accurate inspection by model compounds and suitable mixtures of proteins and saccharides gives a methodology to interpret these experimental data. A good correlation (R(2) = 0.93; R(2) = 0.81) has been obtained by comparing the NMR data with the results of the chemical analyses. The results suggest the possibility to perform a taxonomic study and/or a nutritional study on the basis of the ratio between protein and polysaccharide levels determined by NMR or chemical methodologies.
authors.affiliation: National Institute for Food and Nutrition Research, via Ardeatina 546, 00178 Rome, Italy. pizzof@inn.ingrm.it
authors.forename: L
authors.initials: L
authors.lastname: Pizzoferrato
authors.forename: P
authors.initials: P
authors.lastname: Manzi
authors.forename: F
authors.initials: F
authors.lastname: Bertocchi
authors.forename: C
authors.initials: C
authors.lastname: Fanelli
authors.forename: G
authors.initials: G
authors.lastname: Rotilio
authors.forename: M
authors.initials: M
authors.lastname: Paci
mesh_terms: D000363:Agaricales / Q000737:chemistry*; D002247:Carbon Isotopes; D004043:Dietary Fiber / Q000032:analysis; D019906:Nuclear Magnetic Resonance, Biomolecular; D010940:Plant Proteins / Q000032:analysis*; D020076:Pleurotus / Q000737:chemistry; D011134:Polysaccharides / Q000032:analysis*; D020942:Shiitake Mushrooms / Q000737:chemistry; D013045:Species Specificity
chemical_list: D002247:Carbon Isotopes; D004043:Dietary Fiber; D010940:Plant Proteins; D011134:Polysaccharides