N-乙酰神经氨酸定性标准品
The Neu5,9Ac2 standard standard is a mixture of various sialic acids. The main sialic acid species present, 5-N-acetyl-9-O-acetyl neuraminic acid (Neu5,9Ac2), makes up 77% of the mixture. This product is only for use as a chromatography standard and should be not used as a quantitative standard.

Form: Dry. Dried by centrifugal evaporation from an aqueous solution.

Amount Supplied: ~1 nmol (of which 770 pmol is Neu5,9Ac2)

Storage: -20˚C both before and after dissolution. This product is stable for at least 5 years as supplied.

Shipping: The NGNA standard can be shipped at ambient when dry. After dissolution, ship on dry ice.

Handling: Allow the unopened vial to reach ambient temperature and tap unopened on a solid surface to ensure that most of the lyophilized material is at the bottom of the vial. Gently remove the cap, add the desired volume of reconstitution medium, re-cap and mix thoroughly to bring all the oligosaccharide into solution. For maximal recovery of oligosaccharide, ensure that the cap lining is also rinsed and centrifuge the reconstituted vial briefly before use. Ensure that any glass, plasticware or solvents used are free of glycosidases and environmental carbohydrates. Minimise exposure to elevated temperatures or extremes of pH. High temperatures and low pH will cause desialylation. High pH will cause epimerisation of the reducing terminus GlcNAc.

Safety: This product is non-hazardous and has been purified from natural sources certified to be free of all hazardous material including pathogenic biological agents.