p-Nitrophenyl Phosphate from Mexico
p-Nitrophenyl phosphate (pNPP) is a chromogenic substrate for alkaline phosphatase enzyme assays in biotechnology. Classified under HTS 2920.90.2000 as nitrated derivative of aromatic phosphoric acid ester. Yellow color results from nitro substitution on phenyl ring.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Biotech reagents require cold chain if disodium salt hydrate form; specify storage conditions
• Include intended laboratory use certification to avoid pharmaceutical classification