Also found in: Encyclopedia.

nor·leu·cine (Nle),

α-Amino-n-caproic acid; 2-aminohexanoic acid; an α-amino acid, isomer of leucine and isoleucine, but not found in proteins; a deamination product of l-lysine, to which it is linked in collagens.
Synonym(s): glycoleucine


α-amino-n-caproic acid; 2-aminohexanoic acid; an α-amino acid, not found in proteins; a deamination product of l-lysine, to which it is linked in collagens.
References in periodicals archive ?
Less critical were truncated variants, norleucine and deamidation, all of which were assessed using some form of chromatography.
Sample preparation and description for amino acid analysis: Each lyophilized homogenized muscle sample was treated with norleucine as an internal standard and dried in a pyrolysed tube by placing it in a centrifugal evaporator.
Amino acid content was determined, following acid hydrolysis (6 N HCl), on a Biochrom 20 amino acid analyzer, using the synthetic amino acid Norleucine as an internal standard.
The 30 mg ground sample was weighed into glass ampoules and 5 mL of 6 M HCl and 5 mmol norleucine were added.
7; Scientific Software) using norleucine (Sigma) as an internal standard.
Biochrom recommends that the extracts are deproteinised with sulphosalicylic acid solution containing Norleucine as the internal standard.
Oxalic acid, citric acid, tartaric acid, lithium hydroxide, potassium perchlorate, guanidine thiocyanate, D-tert-leucine, norleucine, [gamma]-aminobutyric acid (GABA), taurine, citrulline, glutamine, asparagine, and amino acid standard mixture (AA-S-18) were from Sigma.
Amino acid identification was accomplished with postcolumn ninhydrin derivatization with norleucine as the internal standard.
curcas seed was determined using Technicon Amino Acid Analyzer (TSM-1 Technicon Instrument, Basingstoke, Hampshire, UK) using Norleucine as internal standard.
Samples were hydrolysed for 24 h at 110[degrees]C with 6 M HCl containing 2 g/L reagent grade phenol and 5,000 nmol norleucine (internal standard) in evacuated and sealed ignition tubes.