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Jose de Jesus Encinas-Arzate,Josafat Marina Ezquerra-Brauer,Victor Manuel Ocaño-Higuera,Benjamin Ramirez-Wong,Lorena Armenta-Villegas,Wilfrido Torres-Arreaola,Enrique Marquez-Rios 한국식품과학회 2014 Food Science and Biotechnology Vol.23 No.2
Myofibrillar protein are the principally responsibleof gelling properties in fishery resource, hence, during proteinconcentrate or isolated proteins preparation, sarcoplasmicprotein are discarded; however, myofibrillar protein cansupport low levels of sarcoplasmic proteins without affectingthe gelling property. Therefore, the aim of this study was togradually remove sarcoplasmic proteins from giant squidmantle by means of different ionic strengths (I). Solutionsof NaCl with different ionic strengths (I=0.0, 0.1, and 0.3)were used to obtain 3 protein concentrates. The electrophoreticprofile in SDS-PAGE showed differences in protein removalwith a high solubility of mantle proteins. The texture profileanalysis showed that hardness increased in mantle proteinwashed with higher I. The total reactive sulfhydryls showedsignificant changes (p<0.05) detecting major formation ofS-S bonds with protein removal at an I of 0.3. Differentialscanning calorimetry showed a minor denaturation temperatureof the actomyosin complex when protein removal wasperformed with an I of 0.3. The present study indicates thatremoval of sarcoplasmic protein as a function of I results inbetter quality gels.
Carine Garcia Hejl,Jose Manuel Ramirez,Philippe Vest, Pharm,Denis Chianea,Christophe Renard 대한진단검사의학회 2014 Annals of Laboratory Medicine Vol.34 No.5
Laboratories working towards accreditation by the International Standards Organization (ISO) 15189 standard are required to demonstrate the validity of their analytical methods. The different guidelines set by various accreditation organizations make it difficult to pro- vide objective evidence that an in-house method is fit for the intended purpose. Besides, the required performance characteristics tests and acceptance criteria are not always de- tailed. The laboratory must choose the most suitable validation protocol and set the ac- ceptance criteria. Therefore, we propose a validation protocol to evaluate the performance of an in-house method. As an example, we validated the process for the detection and quantification of lead in whole blood by electrothermal absorption spectrometry. The fun- damental parameters tested were, selectivity, calibration model, precision, accuracy (and uncertainty of measurement), contamination, stability of the sample, reference interval, and analytical interference. We have developed a protocol that has been applied success- fully to quantify lead in whole blood by electrothermal atomic absorption spectrometry (ETAAS). In particular, our method is selective, linear, accurate, and precise, making it suitable for use in routine diagnostics.