I try to run P NMR for a lignin extracted from biomass. 30 mg of lignin can be fully dissolve if I add 200 μl DMF and 50 μl pyridine mixture. But some solid will be precipitated out if I further add more than 200 μl CDCl3. However, the Bruker 300 MHz spectrophotometer we are using for the NMR can only give good result when more than 200 μl CDCl3 in 500 μl solvent. I'm wondering is there a way to solve this problem?
Bram Jacobs
I don't think deuterated DMSO is appropriate since I believe DMSO-d6 reacts with phosphylating agent TMDP... However, you could use a mixture of deuterated DMF and anhydrous pyridine. No need to add CDCl3 at all
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