Amazing Power of Amino Acids
by Grata Young
In 1838, a Dutch chemist, G.J. Mulder, described a certain organic material as "unquestionably the most important of all known substances in the organic kingdom. Without it, no life appears possible on our planet. Through its means the chief phenomena of life are produced." This complex nitrogen-bearing substance was called protein from the Greek word meaning "take the first place." Protein in now a group name signifying the principal nitrogenous constituents of the protoplasm of all plant and animal tissues.
Proteins are extremely complex organic compounds of the elements carbon, hydrogen, oxygen,
nitrogen, and,with some exceptions, sulphur. Most proteins also contain phosphorous, and some
specialised proteins contain iron, iodine, copper and other inorganic elements. The presence of
nitrogen distinguishes proteins from carbohydrates and fats.
Proteins are thus vital substances, which form important constituent of muscles, tissues, and the
blood. Proteins supply the building material for the body and make good the wear and tear of
tissues. Several substances concerned with vital life processes such as enzymes, which help in
digestion of food, are chiefly protein in nature.
There are several varieties of protein. Each type contains a specific number of "building blocks"
known as amino-acids. Before they can be absorbed by the body, all proteins must first be
broken down into amino-acids. When food stuffs are ingested, the nutrients and amino-acids do
not immediately diffuse into all the different tissues. There are a series of biochemical
reactions
in the digestive tract which collect these proteins, break them down and then utilise them as
needed. Any interference with the normal digestive process causes in-complete protein digestion
resulting in gas, bloating etc.
There are about 22 amino acids needed for the normal functioning of the body. The body can
manufacture many amino acids if it has no adequate nitrogen source, but it cannot produce
certain others in sufficient amounts to meet its needs. The amino acids that the body cannot
synthesis is in adequate amounts are called essential or indispensable because they must be
supplied by the diet in proper proportions and amounts to meet the requirements for
maintenance of growth of tNon-essential or dispensable amino acids are those thatissue. the
body can synthesize in sufficient amounts to meet its needs if the total amount of nitrogen
supplied by protein is adequate. The essential and non-essential amino acids are listed in table
A.
TABLE A
Classification of Amino Acids with respect to their essentiality
Essential Nonessential
Histidine* Alanine
Isoleucine Arginine
Leucine Asparagine
Lysine Aspartic acid
Methionine Cysteine
Phenylalanine Cystine
Theronine Glutamic acid
Trypophan Glutamine
Valine Glycine
Hydroxyproline
Proline
Serine
Tyrosine
*Histidine is required for infants but its essentiality for adults has not been clearly established.
It will be seen from this statement that nine amino acids are
essential for maintenance of
nitrogen equilibrium in human bodies. The estimated requirements of essential amino acids for
infants, children and adults are given in Table B. Men in the older age group appear to differ in
their requirements. Studies seem to suggest an increase need for methionine and lysine for
them. Infants and children have proportionally greater demands for essential amino acids than
adults. In addition, infants require histidine as an essential amino acid.
Factors in addition to the age, sex and physiological condition of an individual influence the
requirements for specific amino acids. If total protein intake is low, small surpluses of certain
amino acids can increase the need for others. The non-essential amino acids in protein also
affect the quality of protein. For example, the amount of sulphur - containing essential amino
acid methionine required may be somewhat reduced if cystine, a sulphur-containing nonessential
amino acid,is supplied in the diet. Likewise, the presence in the diet of tyrosine, a
non-essential amino acid similar in structure to phenylalanine, may reduce the requirement for
phenylalanine.
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