Suc-AAPF-pNA (Suc-Ala-Ala-Pro-Phe-pNA) is a chromogenic p-nitroaniline (pNA) substrate with a Km of 1.7 mM. Suc-AAPF-pNA may be utilized to measure free and membrane-bound cathepsin G in human neutrophils.

Physicochemical Properties

Molecular Formula	C30H36N6O9
Molecular Weight	624.64200
Exact Mass	624.254
CAS #	70967-97-4
PubChem CID	5496888
Appearance	White to off-white solid powder
Density	1.4±0.1 g/cm3
Boiling Point	1072.8±65.0 °C at 760 mmHg
Flash Point	602.6±34.3 °C
Vapour Pressure	0.0±0.3 mmHg at 25°C
Index of Refraction	1.614
LogP	2.58
Hydrogen Bond Donor Count	5
Hydrogen Bond Acceptor Count	9
Rotatable Bond Count	13
Heavy Atom Count	45
Complexity	1100
Defined Atom Stereocenter Count	4
SMILES	N1(CCC[C@H]1C(=O)N[C@H](C(=O)NC1=CC=C([N+]([O-])=O)C=C1)CC1=CC=CC=C1)C(=O)[C@H](C)NC(=O)[C@H](C)NC(=O)CCC(=O)O
InChi Key	LKDMKWNDBAVNQZ-WJNSRDFLSA-N
InChi Code	InChI=1S/C30H36N6O9/c1-18(31-25(37)14-15-26(38)39)27(40)32-19(2)30(43)35-16-6-9-24(35)29(42)34-23(17-20-7-4-3-5-8-20)28(41)33-21-10-12-22(13-11-21)36(44)45/h3-5,7-8,10-13,18-19,23-24H,6,9,14-17H2,1-2H3,(H,31,37)(H,32,40)(H,33,41)(H,34,42)(H,38,39)/t18-,19-,23-,24-/m0/s1
Chemical Name	4-[[(2S)-1-[[(2S)-1-[(2S)-2-[[(2S)-1-(4-nitroanilino)-1-oxo-3-phenylpropan-2-yl]carbamoyl]pyrrolidin-1-yl]-1-oxopropan-2-yl]amino]-1-oxopropan-2-yl]amino]-4-oxobutanoic acid
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month Note: Please store this product in a sealed and protected environment (e.g. under nitrogen), avoid exposure to moisture and light.
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

Solubility Data

Solubility (In Vitro)

DMSO : ~100 mg/mL (~160.09 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.5 mg/mL (4.00 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 2.5 mg/mL (4.00 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 3: ≥ 2.5 mg/mL (4.00 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	1.6009 mL	8.0046 mL	16.0092 mL
	5 mM	0.3202 mL	1.6009 mL	3.2018 mL
	10 mM	0.1601 mL	0.8005 mL	1.6009 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.