摘要:
This invention relates to improvements to medical devices such as biosensors containing proteins such as oxidoreductases, for example oxidaseand/or peroxidase enzymes. More generally it relates to novel compositions containing proteins which are stabilised to ionising radiation.
摘要:
An aqueous composition having increased protein stability is obtained by : a. determining a pH at which the protein has stability at the desired temperature; b. adding to the composition at least one displacement buffer wherein the displacement buffer has a pKa that is at least 1 unit greater or less than the pH of step (a); and c. adjusting the pH of the composition to the pH of step (a); wherein the aqueous composition does not comprise a conventional buffer at a concentration greater than about 2 mM and wherein the conventional buffer has a pKa that is within 1 unit of the pH of step (a).
摘要:
A method of sterilising a protein, comprises exposing to ionising radiation an at least substantially dry composition comprises a protein and a protective compound or combination of protective compounds having both of the following characteristics: (i) a rate of reaction with singlet oxygen greater than 1 x 10 7 L mol -1 S -1; (ii) being a reducing agent whilst at the same time containing a proton dissociable group with a pKa no more than 3 units from the pH of the composition. The compound having characteristic (i) is selected from histidine, thiamine and tryptophan, the compound having characteristic (ii) is selected from methionine, malate, citrate, lactate and tiron. The radiation is gamma radiation or electron beam, whereby the preferred dose is 15 - 40 kGy.
摘要翻译:一种对蛋白质进行灭菌的方法,包括暴露于电离辐射,至少基本上干燥的组合物包含蛋白质和保护性化合物或具有以下两个特征的保护性化合物的组合:(i)与单重态氧的反应速率大于1 x 10 7 L mol -1 S -1; (ii)作为还原剂,同时含有从组合物的pH不超过3单位的pKa的质子可离解基团。 具有特征(i)的化合物选自组氨酸,硫胺素和色氨酸,具有特征(ii)的化合物选自甲硫氨酸,苹果酸盐,柠檬酸盐,乳酸盐和铁。 辐射是γ辐射或电子束,其中优选的剂量是15-40kGy。
摘要:
A composition comprises a biological molecule that is susceptible to aggregation, dimerisation or hydrolysis, wherein the ionic strength is less than 40 mM.
摘要:
A skin dressing is provided comprising a first component comprising a source of protons, a second component comprising a nitrite salt, the dressing comprising a non- thiol reductant, such that, when the first and second components are brought together and applied to a skin site the nitrite reacts to generate nitric oxide, increasing the pH of the dressing in contact with the skin from an acidic value to a more neutral value.
摘要:
Improvements relating to skin dressing A skin dressing adapted, on activation, to generate one or more S-nitrosothiols by reaction between a thiol and a nitrite salt in the dressing, the skin dressing comprising a source of Cu2+, Zn2+ and/or Fe2+ ions for delivery of nitric oxide to a body site is provided.
摘要:
A skin dressing is adapted, on activation, to release one or more S-nitrosothiols, preferably S-nitroso-L-glutathione. S-nitrosothiols decompose spontaneously to produce nitric oxide, which has beneficial effects on tissues, particularly in wound healing.