Labeled D-[1-13C]Arabinose from China
Stable isotope-labeled D-Arabinose with carbon-13 at position 1, used in NMR spectroscopy and metabolic flux analysis. Chemically pure isotopically substituted sugar falls under HTS 2940.00.20.00. Essential for structural elucidation and tracer studies in carbohydrate metabolism.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include isotopic enrichment certificate (typically >98% 13C); customs may require mass spec confirmation
• Declare as stable isotope, not radioactive, to avoid Chapter 28 nuclear materials scrutiny
• Small package sizes (grams) typical; bulk may trigger end-use verification for weapons research