They are derived enzymatically from fatty acids They bring out inflammatory response Ibuprofen's action as a painkiller and fever-reducing compound is due to its ability to inhibit the synthesis of prostaglandins It does this by interfering with the action of an enzyme called cyclooxygenase which catalyzes the conversion of a compound called arachidonic acid into prostaglandins 4 step Ibuprofen synthesis First step: Nucleophilic addition Reduction of the carbonyl group C=O by sodium tetrahydridoborate produces a secondary alcohol group CHOH. Second step: Sn1 nucleophilic substitution of the hydroxyl group To improve reactivity of alcohols the leaving anion OH is converted into H2O CH3)3COH + HCl (37%) (CH3)3COH2(+) Cl() (CH3)3C(+) Cl() + H2O (CH3)3CCl + H2O (SN1 ) Third step: During this step Grignard reagent is formed. Forth step: The nucleophilic addition : carboxylic acid production
lihtsuhkrud) on tegu biopolümeeridega. 2.Kirjeldage, millistel tingimustel saab vesinikside formeeruda. Otsustage, milliste alltoodud ühenditega võivad vee molekulid seostuda vesiniksidemetega ja näidake, kuidas see toimub a. CH3COOH (etaanhape) is capable of both donating and accepting hydrogen bonds, since it contains hydroxyl groups. CH3COOH has a strong hydrogen bonding, since it contains the strongly polar C=O carbonyl group as well. b. CH3(CH2)4CH3 (heksaan) ei moodusta vesiniksidemeid. Tegu on orgaanilise lahusega, puudub N, O ja F rühm, millega vesinik saaks ühineda. c. H2N-CO-NH2 (uurea) on võimeline moodustama vesiniksidemeid, sisaldab nii O ja N rühmi. Vesinikside on täiendav keemiline side, mille moodustab ühe molekuli negatiivse osalaenguga elektronegatiivse elemendi (F, O, N) aatom teise molekuli positiivse osalaenguga vesinikuaatomiga.
muscle during aging of whole muscle prod- 1998; Maddock et al. 2006). In postmortem ucts is increased oxidation of myofibrillar muscle, there are differences between and sarcoplasmic proteins (Martinaud et al. muscles in the rate that postmortem oxidation 1997; Rowe et al. 2004a, b). This results in processes occur (Martinaud et al. 1997). It the conversion of some amino acid residues, has been noted that differences in the rate of including histidine, to carbonyl derivatives oxidation in muscle tissue are seen when (Levine et al. 1994; Martinaud et al. 1997) comparing the same muscles between animals and can cause the formation of intra- and/or and/or carcasses that have been handled dif- inter-protein disulfide cross-links (Stadtman ferently (Juncher et al. 2001). These differ- 1990; Martinaud et al. 1997). In general, both ences may arise because of differences in
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