When we do biomass chemical composition analysis, it often turns out the mass add-up of all the chemical components great than or less than 100%, which is very common.
1. Different chemical components are analyzed by different methods and instrument, which cause the errors
2. For sugar analysis, each sugar has different optimal post-hydrolysis conditions, which cause both under and over hydrolysis of the sugars
3. Klason lignin includes some ash and proteins, which are accounted for twice
4. Uronic acid and acid lignin should be included when doing mass balance.
5. The standard solution composition should be as close as possible the real samples
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