This product is shipped at ambient temperature and is stable at ambient temperature for up to two weeks. For long term storage refrigerated temperature is recommended.
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biological source
bovine
assay
≥98%
form
lyophilized powder
mol wt
~66 kDa
purified by
heat shock fractionation
origin
USA origin
concentration
≥95% protein
free fatty acid content
≤0.02%
technique(s)
ELISA: suitable
blood typing: suitable
ligand binding assay: suitable
impurities
essentially globulin free
loss
≤5%
pH
7
solubility
water: soluble (40 mg/ml)
UniProt accession no.
foreign activity
protease ≤0.005 U/mg
storage temp.
2-8°C
Gene Information
bovine ... ALB(280717)
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Este artículo | A8022 | A3059 | A3803 |
|---|---|---|---|
| assay ≥98% | assay ≥96% | assay ≥98% | assay ≥98% (agarose gel electrophoresis) |
| origin USA origin | origin USA origin | origin USA origin | origin USA origin |
| technique(s) ELISA: suitable, ligand binding assay: suitable, blood typing: suitable | technique(s) ELISA: suitable, blocking: suitable, electrophoresis: suitable, western blot: suitable | technique(s) ELISA: suitable, western blot: suitable | technique(s) cell culture | mammalian: suitable |
| biological source bovine | biological source bovine | biological source bovine | biological source bovine |
| Quality Level 300 | Quality Level 300 | Quality Level 300 | Quality Level 200 |
| form lyophilized powder | form lyophilized powder | form lyophilized powder | form lyophilized powder |
General description
En esta BSA se han evaluado y probado específicamente las siguientes propiedades:
- Contenido muy bajo de proteasas / ausencia de proteasas
- Contenido muy bajo de ácidos grasos / ausencia de ácidos grasos
La BSA sin proteasas es especialmente útil para aplicaciones como:
- Ensayos enzimáticos
- Ensayos basados en proteínas
- Técnicas sensibles a proteasas que incluyen:
b. Hibridación de ácidos nucleicos
c. Radioinmunoanálisis (RIA)
Application
- como constituyente del medio utilizado para la diferenciación de las células madre pluripotentes humanas[4]
- en el enzimoinmunoanálisis de absorción (ELISA) y el ELISA tipo sándwich[5]
- para permeabilizar las células corticales fetales[6]
Esta BSA A7030 se ha utilizado específicamente como componente del tampón bloqueante en un ensayo ELISA basado en péptidos para el análisis de muestras COVID-19 / SARS-CoV-2 (Poh, C.K. et al., Nat.Commun ., 11(1), 2806 (2020)).
Biochem/physiol Actions
Features and Benefits
- Preparada mediante fraccionamiento térmico
- Sin proteasas
- Sin ácidos grasos
- Esencialmente exenta de globulina
Preparation Note
related product
Clase de almacenamiento
11 - Combustible Solids
wgk_germany
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Gloves
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If this material was inadvertently stored at room temperature, what is the room temperature stability?
1 answer-
Helpful?
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How long would a 20% BSA solution be stable in water stored at 4C?
1 answer-
If stored at 2-8 °C, a filter sterilized 20% BSA solution in water or aqueous buffer is generally stable for a minimum of 2.5 - 3 years.
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Is it possible that BSA contains ions such as Mg2+? I am considering adding it to the buffer, but I am concerned that it might activate the enzyme.
1 answer-
The magnesium content of this material is not routinely tested, but historical data indicates that three lots contained between 10-20 parts per million. Water is used as the pre-lyophilization solvent.
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Is product number A7030, Bovine Serum Albumin (BSA) glycosylated?
1 answer-
Unfortunately, there is currently no information available regarding the glycosylation status of BSA product A7030.
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How does protease content determined? With this value all proteases are included? Or only refers to plasmatic proteases.
1 answer-
The specific method used to test this material for protease activity is considered proprietary. However, it is based on the enzymatic cleavage of FITC-Casein. See the link below to review the FITC-Casein Enzymatic Assay to demonstrate the principal of this method.
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/353/850/c3777enz.pdfHelpful?
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what is the expiry of this product?
1 answer-
This product is not assigned an expiration date. It is assigned a recommended retest date of 5 years after the quality release date. The recommended retest date is the period of time during which the product is expected to remain within established stability specifications, provided that it has been stored under defined conditions. After the Retest Date, product samples should be examined to ensure that the product is still in compliance with the established specifications. For more information, you may access the "Product Dating Information" document under "ADDITIONAL USEFUL DOCUMENTS ABOUT OUR PRODUCTS" at the bottom of the Quality Services page with this link: https://www.sigmaaldrich.com/US/en/life-science/quality-and-regulatory-management/quality-services.
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What is the extinction coefficient of this product?
1 answer-
The extinction coefficient for item A7030 has not been determined.
Helpful?
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is it suitable for cell culture?
1 answer-
This product has not been tested for suitability in cell culture. The end user would have to determine suitability. Please see the link below for a cell culture tested version of heat shock fractionated BSA:
https://www.sigmaaldrich.com/product/sigma/a4161Helpful?
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My BSA product is not sterile (open outside BSC hood)--- Can I filter-sterilize with 0.2um filter to use with viable cells solution?
1 answer-
Yes, prepared solutions of bovine serum albumin may be filter sterilized for use in cell culture by using a 0.22 um filter membrane.
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How many lysine residues does A7030 albumin have?
1 answer-
Bovine albumin will have 59 lysine residues but not all of them are accessible for conjugation.
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