Histidine | Nectagen

Histidine

Codes

3-letter Code	His
1-letter Code	H

Classifications

Side-Chain Polarity	Basic Polar
Side-Chain Class	Basic
Side-Chain Charge	Positive (10%), neutral (90%)

pI/pK's

pI	7.60
pKa (α-COOH)	1.80
pKa (α-NH3+)	9.33
pKa (Side-Chain)	6.04

Masses

Avg. Residue Mass (Da)	137.14
Monoisotopic Mass (Da)	137.06
MW (Da)	155.16

Other Properties

Hydropathy Index

-3.20

van der Waals Volume

118

Optical Properties

Max Absorption	Extinction Coefficient
211	5.90

Outside Data

Wikipedia Entry	Histidine

Ingredient(s) Using This Amino Acid

Ingredient(s) Using This Amino Acid

1	L-Histidine Monohydrochloride Monohydrate (solid)
2	L-Histidine Monohydrochloride Monohydrate, 10 mg/ml
3	L-Histidine, 100 mM