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375291 occurrences (No.49 in the rank) during 5 years in the PubMed. [no cache] 500 found

173) In this study, a novel method of precipitating caseins under neutral or weak acidic conditions is presented.

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PMID:24372141 DOI:10.1080/10826068.2013.877030

2015 Preparative biochemistry & biotechnology

* A novel method for separation of caseins from milk by phosphates precipitation.

- Milk protein of farm animals is difficult to isolate because of the presence of casein micelles, which are hard to separate from whey by using centrifugation or filtration. Insoluble casein micelles also create an obstacle for purification instruments to operate efficiently. The conventional method, to precipitate caseins by lowering pH to 4.6 and then recover the whey fraction for further purification using chromatography techniques, is not applicable to proteins having an isoelectric point similar to caseins. In addition, the acid condition used for casein removal usually leads to significantly poor yields and reduced biological activities. In this study, a novel method of precipitating caseins under neutral or weak acidic conditions is presented. The method employs a phosphate salt and a freeze-thaw procedure to obtain a casein-free whey protein fraction. This fraction contains more than 90% yield with little loss of bioactivity of the target protein, and is readily available for further chromatographic purification. This method was successfully applied to purify recombinant human factor IX and recombinant hirudin from the milk of transgenic pigs in the presented study. It is an efficient pretreatment approach prior to chromatographic purification of milk protein from farm animals and particularly of great value to collect those recombinants secreted from transgenic livestock.

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(2)59 for	(13)6 using	(24)2 among	(35)2 on
(3)39 of	(14)5 has	(25)2 but	(36)2 provided
(4)39 to	(15)5 used	(26)2 by	(37)2 should
(5)37 was	(16)4 showed	(27)2 choice	(38)2 study
(6)26 is	(17)4 which	(28)2 combined	(39)2 the
(7)24 and	(18)3 are	(29)2 could	(40)2 uses
(8)15 in	(19)3 as	(30)2 from	(41)2 we
(9)9 that	(20)3 significantly	(31)2 helped
(10)8 can	(21)2 a	(32)2 involves
(11)7 based	(22)2 against	(33)2 known

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--- WordNet output for method --- =>方法, 筋道, 秩序, 規則正しさ, 順序 Overview of noun method The noun method has 2 senses (first 1 from tagged texts) 1. (95) method -- (a way of doing something, especially a systematic way; implies an orderly logical arrangement (usually in steps)) 2. method acting, method -- (an acting technique introduced by Stanislavsky in which the actor recalls emotions or reactions from his or her own life and uses them to identify with the character being portrayed) --- WordNet end ---