p-Nitrophenyl Phosphate
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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when packaged as diagnostic reagent kit component
Immunological/diagnostic products containing these classified under Chapter 30.
If imported as laboratory reagent preparation
Lab diagnostic reagents often classified as Chapter 38 biochemical products.
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Import Tips & Compliance
• Biotech reagents require cold chain if disodium salt hydrate form; specify storage conditions
• Include intended laboratory use certification to avoid pharmaceutical classification
Related Products under HTS 2920.90.20.00
Triphenyl Phosphate
Triphenyl phosphate is an aromatic ester of phosphoric acid used as a flame retardant in plastics and resins. It falls under HTS 2920.90.2000 as an aromatic ester of an inorganic acid (phosphoric acid) of a nonmetal (phosphorus), excluding hydrogen halides. Its structure features three phenyl groups attached to the phosphate core.
Cresyl Diphenyl Phosphate
Mixed aromatic phosphate ester combining cresyl and phenyl groups, used in hydraulic fluids and flame retardants. Falls under HTS 2920.90.2000 as 'other' aromatic esters of phosphoric acid. Chemically defined with specific CAS 26444-49-5.
Diphenyl Phosphorochloridite
Aromatic chloridite ester used as intermediate in pharmaceutical synthesis and organophosphorus chemistry. Although containing chlorine, classified under 2920.90.2000 as phosphoric acid ester derivative, not hydrogen halide ester per chapter exclusion. Chemically defined with P-Cl and P-OPh2 structure.
Diphenyl Methylphosphonate
Aromatic phosphonate ester with methyl substitution, used in extractive metallurgy and as flame retardant. Falls under HTS 2920.90.2000 as 'other' aromatic ester of phosphonic acid. Chemically defined per chapter note (a).
Phenethyl Bromide Phosphonate Ester
Halogenated aromatic phosphonate used in pharmaceutical synthesis and polymer chemistry. Classified under HTS 2920.90.2000 as halogenated derivative of aromatic phosphonic acid ester per chapter note. Bromine substitution on phosphonate chain.
Tricresyl Phosphate (TCP)
Tricresyl phosphate is an aromatic organophosphate ester used as plasticizer and flame retardant in PVC and lubricants. Classified under HTS 2920.90.2000 as an aromatic ester of phosphoric acid with cresyl (methylphenyl) groups. It meets chapter 29 criteria for chemically defined inorganic acid esters.