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333489 occurrences (No.56 in the rank) during 5 years in the PubMed. [no cache] 500 found

356) The results showed that levothyroxine sodium samples degraded significantly over a 32-day test period when subjected to dry conditions in the presence of molecular oxygen.

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PMID:24295156 DOI:10.3109/10837450.2013.862635

2015 Pharmaceutical development and technology

* Impact of hydration state and molecular oxygen on the chemical stability of levothyroxine sodium.

- Levothyroxine sodium is an important medication used primarily for treating patients with hypothyroidism. Levothyroxine sodium tablets have been recalled many times since their 1955 introduction to the US market. These recalls resulted from the failure of lots to meet their content uniformity and potency specifications. The purpose of this study is to test the hypothesis that the chemical stability of levothyroxine sodium pentahydrate is compromised upon exposing the dehydrated substance to molecular oxygen. The impact of temperature, oxygen and humidity storage conditions on the stability of solid-state levothyroxine sodium was examined. After exposure to these storage conditions for selected periods of time, high performance liquid chromatography (HPLC) was used to quantify the formation of impurities. The results showed that levothyroxine sodium samples degraded significantly over a 32-day test period when subjected to dry conditions in the presence of molecular oxygen. However, dehydrated samples remained stable when oxygen was removed from the storage chamber. Furthermore, hydrated samples were stable in the presence of oxygen and in the absence of oxygen. These results reveal conditions that will degrade levothyroxine sodium pentahydrate and elucidate measures that can be taken to stabilize the drug substance.

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(1)52 mechanisms	(19)5 docking	(37)3 recognition	(55)2 heparin
(2)26 weight	(20)5 information	(38)3 serotyping	(56)2 identification
(3)18 data	(21)5 methods	(39)3 sieve	(57)2 knowledge
(4)18 mechanism	(22)5 modeling	(40)3 structure	(58)2 mass
(5)16 dynamics	(23)5 phylogenetic	(41)3 techniques	(59)2 mechanisms,
(6)15 and	(24)5 targets	(42)3 variance	(60)2 or
(7)10 analysis	(25)4 diagnosis	(43)2 Dynamics	(61)2 oxygen
(8)10 basis	(26)4 interactions	(44)2 approach	(62)2 perspectives
(9)8 characterization	(27)4 level	(45)2 biological	(63)2 phenotypic
(10)7 epidemiology	(28)4 level,	(46)2 classification	(64)2 phylogenies
(11)7 genetic	(29)4 responses	(47)2 clock	(65)2 probes
(12)7 imaging	(30)4 target	(48)2 dating	(66)2 profiles
(13)6 biology	(31)3 evolution	(49)2 details	(67)2 subtype
(14)6 changes	(32)3 features	(50)2 diffusion	(68)2 therapies
(15)6 markers	(33)3 levels	(51)2 effects	(69)2 underpinnings
(16)6 pathways	(34)3 marker	(52)2 events
(17)5 analyses	(35)3 medicine	(53)2 evidence
(18)5 characteristics	(36)3 orbital	(54)2 genetics

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--- WordNet output for molecular --- =>分子の Overview of adj molecular The adj molecular has 2 senses (first 1 from tagged texts) 1. (6) molecular -- (relating to or produced by or consisting of molecules; "molecular structure"; "molecular oxygen"; "molecular weight is the sum of all the atoms in a molecule") 2. molecular -- (relating to simple or elementary organization; "proceed by more and more detailed analysis to the molecular facts of perception"--G.A. Miller) --- WordNet end ---