Luteinization

One of the xanthophyll pigments present in various leaves, seeds and fruits, and in yolk of egg. It is often present in company with lutein, of which it is an isomer. It bears the same relation to -carotene as lutein does to a-caro tene. 

Solvent extraction removes chlorophyll and other pigments to give a light-colored product but increases processing costs. Furthermore, solvent extraction removes p-carotene and reduces vitamin A activity (89) (see Terpenoids Vitamins). Supercritical CO2 extraction at 30 and 70 MPa (4,350 and 10,150 psi) and 40°C removed 90 and 70% carotene and lutein, respectively, from alfalfa LPC (96). This process avoids organic solvent residues and recovers valuable by-products. 

Sulfated oligosaccharide from bovine luteinizing hormone... 

Fett-entziehung, /. fat extraction, -farbe, /. fat-soluble color, oil color, -farbstoff, m. color for fats (Micros.) fat stain (Bio-chem.) lipochrome, lutein, -fleck, -flecken, m. grease spot. 

Thyroid stim. hormone Follicle-stim. hormone Luteinizing hormone... 

Chorionic gonadotropin (CG) is produced in the placenta. Together- with the pituitary hormones, luteinizing hormone (LH) and follicle-stimulating hormone (FSH), it constitutes the glycoprotein family of gonadotropins. The actions of CG are mediated by the LH receptor, both belonging to the superfamily of G-protein Coupled Receptors. 

LH-RH (Luteinizing Hormone-Releasing Hormone) agonists are drugs that inhibit the secretion of sex hormones. In men, LH-RH agonists cause testosterone levels to fall. In women, LH-RH agonists cause the levels of estrogen and other sex hormones to fall. 

An exopeptidase that does not cleave standard peptide bonds. An example is pyroglutamyl-peptidase I (MEROPS C15.010), which releases an N-terminal pyroglutamyl from hormones such as thyrotropinreleasing hormone and luteinizing hormone. Omega peptidases are included in Enzyme Nomenclature subsubclass 3.4.19. 

A further thirty years were to pass before Kuhn and his co-workers (3) successfully repeated Tswetf s original work and separated lutein and xanthine from a plant extract. Nevertheless, despite the success of Kuhn et al and the validation of Tswett s experiments, the new technique attracted little interest and progress continued to be slow and desultory. In 1941 Martin and Synge (4) introduced liquid-liquid chromatography by supporting the stationary phase, in this case water, on silica in the form of a packed bed and used it to separate some acetyl amino acids. 

CN 6-D-tryptophan-9-(Af-ethyl-L-prolinamide)-10-deglycinamide luteinizing hormone-releasing factor (pig)... 

Qv, X. Y., Zeng, Z. P. Jiang, J. G. (2011). Preparation of lutein microencapsulation by complex coacervation method and its physicochemical properties and stability. Food Hydrocolloids, Vol. 25, 6, (August 2011), pp. (1596-1603), ISSN 0268-005X... 

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