L Isoleucine

  • Chemical Name:L-Isoleucine
  • CAS No.:73-32-5
  • MF:C6H13NO2
  • MW:131.17
  • Purity:>98% or As customer requested
  • Color:White to Off-white
  • Product Categories:Biochemistry;Nutritional Supplements;L-Amino Acids;Amino Acids; APIs; Biochemical Engineering
  • Test method: HPLC


What is L-isoleucine?

An amino acid with the symbol “l isoleucine” or “I” is used in the biosynthesis of proteins. Leucine isoleucine has a hydrocarbon side chain with a branch (a central carbon atom bound to three other carbon atoms), an -amino group (which is in the protonated NH+ 3 form in biological conditions), and a -carboxylic acid group (which is in the deprotonated COO form in biological conditions).

At physiological pH, l isoleucine is classified as an aliphatic, non-polar, branched-chain, uncharged amino acid. It is necessary for humans to eat because the body cannot produce it on its own. L-isoleucine is orchestrated from pyruvate utilizing leucine biosynthesis compounds in different living beings, for example, bacteria. It is encoded by the codons AUU, AUC, and AUA.

Basic information   

Product Name: L-Isoleucine
Synonyms: Isoleucine; (S)-Isoleucine; L-(+)-Isoleucine; Isoleucinum; Isoleucina; 
CAS: 73-32-5
MF: C6H13NO2
MW: 131.17
EINECS: 200-798-2
Product Categories: Biochemistry;Nutritional Supplements;L-Amino Acids;Amino Acids; APIs; Biochemical Engineering
Chemical Structure


Chemical Properties   

Melting point  288 °C (dec.) (lit.)
alpha  41 º (c=4, 6N HCl)
Boiling point  225.8±23.0 °C(Predicted)
density  1.2930 (estimate)
refractive index  40.5 ° (C=4, 6mol/L HCl)
Fp  168-170°C
storage temp.  Store below +30°C.
solubility  1 M HCl: 50 mg/mL
pka 2.32, 9.76(at 25℃)
form  powder
color  White to Off-white
PH 5.5-6.5 (40g/l, H2O, 20℃)
optical activity [α]20/D +41.0±1°, c = 5% in 6 M HCl
Water Solubility  41.2 g/L (50 ºC)
λmax λ: 260 nm Amax: 0.07
λ: 280 nm Amax: 0.05
Sublimation  168-170 ºC
Merck  14,5179
JECFA Number 2118
BRN  1721792
L Isoleucine Usage And Synthesis

L-Isoleucine Uses            


L isoleucine is essential for muscle tissue’s energy supply, which is especially important during prolonged physical strain.

Leucine isoleucine boosts muscle growth and hormone balance, resulting in increased power, strength, and endurance by lowering cortisol and increasing testosterone.


collaborates with valine and leucine, the other l-isoleucine that make up the branched chain amino acids (BCAA), to enhance muscle tissue repair, increase fat burning, and contribute to the production and maintenance of proteins.

System of immunity

involved in the creation of structural and functional antibodies that l isoleucine prevent viruses and harmful bacteria from spreading.

Maxmedchem, a global supplier of L-Isoleucine, 73-32-5 offers for your requirements of RND / Development quantities or commercials, based on status of the product. 

a) Free sample can be supplied.

b) Guide our clients by professional knowledge and teach them how to use our product after sales.

c) Accept SGS,BV any other third-party inspection before loading.

d) High quality best price Guaranteed.

MSDS: MSDS available.

COA: COA can be available if you send us inquiry.

Email us at: info@maxmedchem.com for more details.

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