Table 1. Tolerance limits of Ftu-UPT-LF assay to pH, ion strength, viscosity, biomacromolecule, and real samples.

Interference Factor		Ftu-UPT–LF
pH value	HCl	≤0.01 mol · L−1 (pH 2)
	NaOH	≥0.1 mol · L−1 (pH 13)
Ion strength	NaCl + KCl	≥2 mol · L−1
Viscosity	PEG20000	≤50 mg · mL−1
	Glycerol	≥20% (v/v)
Biomacromolecule	BSA	≥400 mg · mL−1
	Casein	≥80 mg · mL−1
Powder	Flour	≥200 mg · mL−1
	Fruit juice	≥200 mg · mL−1
	Gourmet powder	≥200 mg · mL−1
	Milk powder	≤50 mg · mL−1
	Putty powder	≥200 mg · mL−1
	Soil	≤100 mg · mL−1
	Sucrose	≥200 mg · mL−1
Viscera	Fresh heart	≥400 mg · mL−1
	Fresh liver	≥400 mg · mL−1
	Fresh lung	≥400 mg · mL−1
	Fresh spleen	≥400 mg · mL−1
	Decomposed heart	≥400 mg · mL−1
	Decomposed liver	≥400 mg · mL−1
	Decomposed lung	≥400 mg · mL−1
	Decomposed spleen	≥400 mg · mL−1