essential amino acids


Also found in: Dictionary, Thesaurus, Encyclopedia.

es·sen·tial a·mi·no ac·ids

α-amino acids nutritionally required by an organism that must be supplied in its diet (that is, cannot be synthesized by the organism) either as free amino acid or in proteins.

essential amino acids

A group of eight amino acids (isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine) which are essential for normal growth and development of humans; absence of an essential amino acid results in a negative nitrogen balance. In premature infants, histidine, arginine and cystine are also essential.

es·sen·tial a·mi·no ac·ids

(ĕ-sen'shăl ă-mē'nō as'idz)
The α-amino acids nutritionally required by an organism that must be supplied in its diet (i.e., cannot be synthesized by the organism), either as free amino acids or in proteins.

essential amino acids

Those AMINO ACIDS that cannot be synthesized in the body and must be included in the diet. They include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine.
References in periodicals archive ?
myristica) Amino acid Concentration Infant requirement crude protein range crude protein (mg/g) (mg/g) Lysine * 33.5 53-76 Histidine * 21.9 18-36 Arginine * 42.4 -- Aspartic acid 72.0 -- Threonine * 25.4 40-50 Serine 36.3 -- Glutamic acid 85.8 -- Proline 23.3 -- Glycine 38.0 -- Alanine 40.0 -- Cystine 9.1 29-60 Valine* 36.4 44-77 Methionine * 9.9 29-60 Isoleucine * 28.3 41-53 Leucine * 73.3 83-107 Tyrosine 30.5 58-118 Phenylalanine * 42.8 58-118 FAO/WHO (1985); * essential amino acids Table 4.
The essential amino acids components of flaxseed has been found as lysine 4.0 mg, valine 4.6 mg, histidine 2.2 mg, methionine 1.5 mg, arginine 9.2 mg, leucine 5.8 mg and isoleucine 4.0 mg/100 g of protein.
Amino acid Irvigna gabonesis Citrullus colocynthis (ogbono) (melon) * Arginine 5.01 9.32 * Histidine 2.02 4.79 * Isoleucine 3.42 1.68 * Leucine 6.94 1.74 * Lysine 3.67 6.35 * Methionine 0.86 5.51 * Phenylalanine 3.77 2.06 * Threonine 3.20 1.46 * Valine 3.81 2.20 Alanine 2.36 2.47 Aspartic acid 6.08 5.02 Cysteine 7.28 0.73 Glycine 4.06 2.98 Glutamic acid 9.54 5.95 Proline 3.05 1.42 Serine 2.22 2.05 Tyrosine 1.10 1.83 * = Essential amino acid.
(9) The combination of carbohydrates and essential amino acids has demonstrated a beneficial effect on muscle protein synthesis, which was shown to be greater than the summation of their individual effects.
Multiple sources of protein promote protein synthesis after exercise, but only those with essential amino acids elevate synthesis.
Livestock require essential amino acids in their diets and sufficient nonspecific sources of nitrogen with which to make the nonessential amino acids.
The remaining eight (essential amino acids) we need to get from our diet.
It can be used throughout life as a protein source that is extremely low in phenylalanine and balanced for the remaining essential amino acids.
Unfortunately, it offers only small amounts of essential amino acids.
These patients had significantly lower plasma concentrations of most essential amino acids (isoleucine, leucine, lysine, threonine and valine); the exceptions being methionine and phenylalanine.
All the amino acids are essential to the body structure, but eight of them are essential in the diet, where human beings are concerned, and it is these eight that are considered the essential amino acids.