A tetramer is a protein with four subunits (tetrameric). There are homo-tetramers (all subunits are identical) such as glutathione S-transferase, dimers of hetero-dimers such as haemoglobin (a dimer of an alpha/beta dimer), and hetero-tetramers, where each subunit is different. A representation of the 3D structure of myoglobin, showing coloured alpha helices. ... In structural biology, a protein subunit or subunit protein is a single protein molecule that assembles (or coassembles) with other protein molecules to form a multimeric or oligomeric protein. ... The Glutathione S-transferase (GST) family of enzymes comprises a long list of cytosolic, mitochondrial, and microsomal proteins which are capable of multiple reactions with a multitude of substrates, both endogenous and xenobiotic. ... 3-dimensional structure of hemoglobin Hemoglobin or haemoglobin is the iron-containing oxygen-transport metalloprotein in the red cells of the blood in mammals and other animals. ... Sucrose, or common table sugar, is composed of glucose and fructose. ... Sucrose, or common table sugar, is composed of glucose and fructose. ...
Since it was anticipated that the analysis of olive oil for VC tetramer would have a relatively poor limit of detection, exposure of PVC samples to olive oil used a high ratio of contact area to oil mass.
The approach taken to determine levels of VC tetramer in samples of PVC was to dissolve the plastic in THF and then precipitate the high molecular weight fraction by the addition of a poor solvent, hexane.
The results in table 3 demonstrate that each tetramer isomer is stable enough to draw the conclusion that the failure to detect tetramer in migration tests was because of a lack of migration and not because of instability in the simulant.
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