Question: Q1: What are the main two common uses for Pentetic Acid and Ethylenediaminetetraacetic acid?

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Soy formula: Soy formula is a substitute for human breast milk.  It is a commercial product based on the proteins found in soybeans.  Soy infant formula uses processed soybeans as its source of protein, and comes in powdered or liquid form.  Usually lactose-free, soy infant formula contains a different sugar.  Infants who are intolerant of cows’ milk protein may also be intolerant of soy protein.  It differs from human breast milk in a number of ways.  Soy protein inhibits the absorption of iron.  The soy-based formulas discussed by the World Health Organization reports that soy formula is fortified with iron to compensate for this effect.  One naturally occurring plant-based compound found in soy-based infant formula is phytic acid.  It is also a strong inhibitor of iron absorption, though it can be removed in processing.  It is not known how many manufacturers of soy-based formula incorporate this practice.  China and Vietnam have regulated soy-based infant formulas to include NaFeEDTA (sodium-feric ethylenediaminetetraacetic acid) to fortify the formula and enhance the absorption of iron by the infant.  When iron compounds are added to soy-based infant formula, the iron compound is encapsulated to prevent it from making the formula dark.

Hemagglutination: Hemagglutination, or haemagglutination, is a specific form of agglutination that involves red blood cells (RBCs).  It has two common uses in the laboratory: blood typing and the quantification of virus dilutions in a haemagglutination assay.

TPEN: TPEN ("N","N","N′","N′"-tetrakis(2-pyridinylmethyl)-1,2-ethanediamine) is an intracellular membrane-permeable ion chelator for zinc.  Chelators can be used in chelation therapy to remove toxic metals in the body.  TPEN is a chelator that has a high affinity for zinc.  For example, one study showed that TPEN is a stronger chelator compared to other chelators like pentetic acid (DTPA) when high levels of zinc are present (15 µM).  When low levels of zinc were present however (0, 3, 6, 9 and 12 µM zinc), there was no significant difference.  TPEN is a hexadentate ligand which also forms complexes with other soft metal ions such as Cd.

Organic acid anhydride: An organic acid anhydride is an acid anhydride that is an organic compound.  An acid anhydride is a compound that has two acyl groups bonded to the same oxygen atom.  A common type of organic acid anhydride is a carboxylic anhydride, where the parent acid is a carboxylic acid, the formula of the anhydride being (RC(O))O. Symmetrical acid anhydrides of this type are named by replacing the word "acid" in the name of the parent carboxylic acid by the word "anhydride".  Thus, (CHCO)O is called "acetic anhydride."  Mixed (or unsymmetrical) acid anhydrides, such as acetic formic anhydride (see below), are known.

Ethylenediaminetetraacetic acid: Ethylenediaminetetraacetic acid (EDTA), also known by several other names, is a chemical used for both industrial and medical purposes.

Pentetic acid: Pentetic acid or diethylenetriaminepentaacetic acid (DTPA) is an aminopolycarboxylic acid consisting of a diethylenetriamine backbone with five carboxymethyl groups.  The molecule can be viewed as an expanded version of EDTA and is used similarly.  It is a white, water-soluble solid.

Pendetide: Pendetide (GYK-DTPA) is a chelating agent.  It consists of pentetic acid (DTPA) linked to the tripeptide glycine (G) – -tyrosine (Y) – -lysine (K).

Skurfing (sport): Skurfing as a sport has two common uses: "water skurfing" and "street skurfing".

EDTA (disambiguation): EDTA is "ethylenediaminetetraacetic acid" (and "ethylenediaminetetraacetate"), a chemical compound

2-Iodobenzoic acid: 2-Iodobenzoic acid, or "o"-iodobenzoic acid, is an organic compound with the formula ICHCOOH.  The synthesis of 2-iodobenzoic acid "via" the diazotization of anthranilic acid is commonly performed in university organic chemistry labs.  One of its most common uses is as a precursor for the preparation of IBX and Dess–Martin periodinane, both used as mild oxidants.

Supporting paragraphs: Pentetic acid Ethylenediaminetetraacetic acid
Answer: industrial and medical purposes.