The specific structural composition of this product is not determined on a lot-to-lot basis. However, this material is predominantly an α-helical protein. Based on available literature, the secondary structure consists of approximately 54–67% α-helix and 10–18% β-sheet or β-structure, with the remaining portion consisting of turns and unordered, or random-coil, regions. Variations may occur depending on the analytical method and experimental conditions.
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| Voi/SKU | Disponibilità | Prezzo |
|---|---|---|
10 g | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 169,00 € |
50 g | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 451,00 € |
100 g | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 758,00 € |
500 g | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 3030,00 € |
1 kg | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 4570,00 € |
5 kg | Per informazioni sulla disponibilità, contatta il Servizio Clienti. | 17.120,00 € |
Informazioni su questo articolo
169,00 €
biological source
bovine
Quality Segment
assay
≥98%
form
lyophilized powder
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)
General description
Questo prodotto BSA viene appositamente valutato e testato per verificare le seguenti proprietà:
- Contenuto di proteasi molto basso o nullo
- Contenuto di acidi grassi molto basso o nullo
La BSA priva di proteasi è particolarmente utile in alcune applicazioni:
- Saggi enzimatici
- Saggi basati sulle proteine
- Tecniche sensibili alle proteasi che includono:
b. ibridazione di acidi nucleici
c. radioiimmunodosaggio (RIA)
Application
- come componente del terreno usato per la differenziazione di cellule staminali pluripotenti umane
- nel saggio di immunoassorbimento enzimatico (ELISA) e nell′ELISA a sandwich
- per permeabilizzare le cellule corticali fetali
Nello specifico, questa BSA A7030 è stata usata come componente del tampone di bloccaggio in un saggio ELISA basato su peptidi per l′analisi di campioni di COVID-19 / SARS-CoV-2 (Poh, C.K. et al., Nat. Commun., 11(1), 2806 (2020)).
Biochem/physiol Actions
Features and Benefits
- Frazionamento per shock termico
- Priva di proteasi
- Priva di acidi grassi
- Essenzialmente priva di globuline
Preparation Note
1 of 1
Questo articolo | |||
|---|---|---|---|
| description heat shock fraction, protease free, fatty acid free, essentially globulin free, pH 7, ≥98% | description heat shock fraction, protease free, low endotoxin, suitable for cell culture, pH 7, ≥98% | description heat shock fraction, microbiologically tested, ≥96% (agarose gel electrophoresis) | description heat shock fraction, protease free, suitable for hybridization, pH 7, ≥98% |
| assay ≥98% | assay ≥98% | assay ≥96% (agarose gel electrophoresis) | assay ≥98% |
| origin USA origin | origin USA origin | origin USA origin | origin USA origin |
| biological source bovine | biological source bovine | biological source bovine | biological source bovine |
| technique(s) blood typing: suitable, ligand binding assay: suitable, ELISA: suitable | technique(s) cell culture | mammalian: suitable | technique(s) cell culture | mammalian: suitable | technique(s) ELISA: suitable, electrophoresis: suitable, western blot: suitable |
| Quality Level 300 | Quality Level 200 | Quality Level 200 | Quality Level 200 |
| form lyophilized powder | form lyophilized powder | form lyophilized powder | form lyophilized powder |
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Classe di stoccaggio
11 - Combustible Solids
Punto di infiammabilità (°F)
Not applicable
Punto di infiammabilità (°C)
Not applicable
DPI (dispositivi di protezione individuale)
Eyeshields, Gloves
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What is the percentage composition of secondary structure?
1 risposta-
Utile?
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Is this BSA product (A7030) endotoxin free and suitable for cell culture usage?
1 risposta-
This Bovine Serum Albumin is not tested for endotoxins. Please see the following options of BSA products which are tested for endotoxins:
https://www.sigmaaldrich.com/product/sigma/a8806
https://www.sigmaaldrich.com/product/sigma/a1933
https://www.sigmaaldrich.com/product/sigma/a2934Utile?
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Would there be any concerns storing diluted aliquots at -70C for long term storage (1 year) or is it recommended still at 2-8C?
1 risposta-
The stability of this material in solution, when stored at -70 °C, has not been evaluated. However, Albumin containing solutions are generally stable when stored at -20 to -80 °C in single use aliquots for at least 1 year. Also note that a number of sterile prepared BSA solutions currently available may be stored at 2–8 °C with assigned retest dates that range from 2 – 4 years from the date of Quality Release. Albumin is quite stable in solution and freezer storage may not be necessary.
Utile?
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What is the concentration or percentage of fatty acid free?
1 risposta-
The minimum allowable free fatty acid content is ≤ 0.02% (w/w), as determined by enzymatic assay. A review of recent lots indicates typical values of 0.00% free fatty acids. This information is lot-specific and reported in the Certificate of Analysis. Please see the link below to access a sample or lot-specific Certificate:
https://www.sigmaaldrich.com/product/sigma/a7030#product-documentationUtile?
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Is this product biotin-free?
1 risposta-
This product is not routinely tested for Biotin. However, this material is dialyzed with a 10 kDa cutoff membrane. This dialysis step removes small molecules such as biotin, which has a molecular weight of less than 500 Da. Therefore, this product is considered low in biotin, helping to prevent interference with streptavidin–biotin binding.
Utile?
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If this material was inadvertently stored at room temperature, what is the room temperature stability?
1 risposta-
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.
Utile?
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How long would a 20% BSA solution be stable in water stored at 4C?
1 risposta-
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.
Utile?
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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 risposta-
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.
Utile?
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Is product number A7030, Bovine Serum Albumin (BSA) glycosylated?
1 risposta-
Unfortunately, there is currently no information available regarding the glycosylation status of BSA product A7030.
Utile?
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How does protease content determined? With this value all proteases are included? Or only refers to plasmatic proteases.
1 risposta-
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.pdfUtile?
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