Additional orthogonal controls include amino acid analysis (AAA) via acid hydrolysis then OPA derivatization, water content by Karl Fischer, residual salt content by conductometry or ion chromatography, and endotoxin analysis by LAL kinetic chromogenic
Wolff, S.F., 1994, Ferrous ion oxidation in the presence of ferric ion indicator xylenol orange for measurement of hydrogen peroxides, Methods Enzymology 233, 182189
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, Zhang L., Ye Z.W., Zhang J., Tew K
Author contributions ZL: Data curation, Validation, Conceptualization, Project administration, Methodology, Visualization, Formal analysis, Supervision, Writing original draft, Writing review & editing, Investigation