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Young, Lyndsay E.A.; Brizzee, Corey O.; Macedo, Jessica K.A.; Murphy, Robert D.; Contreras, Christopher J.; DePaoli-Roach, Anna A.; Roach, Peter J.; Gentry, Matthew S.; Sun, Ramon C.
Carbohydrate polymers, 02/2020, Letnik: 230Journal Article
•Simultaneous quantitation of glucose and glucose phosphate esters in glycogen.•This assay provides robust dynamic range with excellent accuracy and reproducibility.•Quantitation of glucose-2-phosphate with in-house synthesized standard.•This assay can be adapted for plant starch, amylopectin or other biopolymers. The addition of phosphate groups into glycogen modulates its branching pattern and solubility which all impact its accessibility to glycogen interacting enzymes. As glycogen architecture modulates its metabolism, it is essential to accurately evaluate and quantify its phosphate content. Simultaneous direct quantitation of glucose and its phosphate esters requires an assay with high sensitivity and a robust dynamic range. Herein, we describe a highly-sensitive method for the accurate detection of both glycogen-derived glucose and glucose-phosphate esters utilizing gas-chromatography coupled mass spectrometry. Using this method, we observed higher glycogen levels in the liver compared to skeletal muscle, but skeletal muscle contained many more phosphate esters. Importantly, this method can detect femtomole levels of glucose and glucose phosphate esters within an extremely robust dynamic range with excellent accuracy and reproducibility. The method can also be easily adapted for the quantification of plant starch, amylopectin or other biopolymers.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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