The percentage of protein and units per mg of protein are reported in the batch-specific Certificate of Analysis. Multiplying these two values yields units per mg of solid. This value should be used to calculate activity when the powder is weighed out. For example, if the protein percentage is 10.4% and the units per mg is 1358 (lot 0000509386), the calculation would be as follows:
10.4% × 1358 = 141.232 units/mg solid
To prepare a dissolution medium containing 750,000 units/L, the calculation would be:
750,000 / 141.232 ≈ 5310.41 mg
Thus, approximately 5.3 grams of powder per liter is required.
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| Packungsgröße | SKU | Verfügbarkeit | Preis |
|---|---|---|---|
| 100 g | Warenkorb auf Verfügbarkeit prüfen | € 131,00 | |
| 500 g | Warenkorb auf Verfügbarkeit prüfen | € 418,00 |
Über diesen Artikel
€ 131,00
biological source
Porcine gastric mucosa
Quality Segment
form
powder
specific activity
≥400 units/mg protein
mol wt
35 kDa
solubility
10 mM HCl: soluble 1.0 mg/mL, clear to faintly turbid, colorless
UniProt accession no.
storage temp.
2-8°C
Gene Information
pig ... LOC396892(396892)
Application
Biochem/physiol Actions
Pepsin ist das wichtigste im Magen produzierte proteolytische Enzym. Es verdaut Proteine durch Aufspaltung der inneren Peptidverbindungen.
Analysis Note
Other Notes
1 of 1
Dieser Artikel | |||
|---|---|---|---|
| biological source Porcine gastric mucosa | biological source Porcine gastric mucosa | biological source - | biological source Porcine gastric mucosa |
| Gene Information pig ... LOC396892(396892) | Gene Information pig ... LOC396892(396892) | Gene Information pig ... LOC396892(396892) | Gene Information pig ... LOC396892(396892) |
| specific activity ≥400 units/mg protein | specific activity ≥3,200 units/mg protein | specific activity ≥2,500 units/mg protein (E1%/280) | specific activity ≥250 units/mg solid |
| form powder | form lyophilized powder | form lyophilized powder | form powder |
| mol wt 35 kDa | mol wt 35 kDa | mol wt 35 kDa | mol wt 35 kDa |
| storage temp. 2-8°C | storage temp. −20°C | storage temp. −20°C | storage temp. 2-8°C |
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signalword
Danger
hcodes
Hazard Classifications
Eye Irrit. 2 - Resp. Sens. 1 - Skin Irrit. 2 - STOT SE 3
target_organs
Respiratory system
Lagerklasse
11 - Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
dust mask type N95 (US), Eyeshields, Faceshields, Gloves
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Protokolle
This procedure may be used for determination of Pepsin activity using hemoglobin as the substrate. It is a spectrophotometric stop rate determination.
Global Trade Item Number
| SKU | GTIN |
|---|---|
| P7125-500G | 04061835558629 |
| P7125-100G | 04061835558612 |
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How can I calculate the amount of pepsin P7125 needed to prepare a dissolution medium containing 750,000 units/L? Do I need to consider the reported protein percentage and the units/mg of protein to obtain the correct amount?
1 answer-
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How can I find out the protein content of each lot? I want to make a 1 mg pepsin protein (not powder) / ml solution. The CoA only shows protein content is greater than1; it does not state the actual protein content for each lot.
1 answer-
The % Protein and specific activity is published in the lot specific Certificate of Analysis (COA):
https://www.sigmaaldrich.com/product/sigma/p7125#product-documentationThe Specification Sheet is not lot specific, and only provides the testing criteria for each batch.
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Can you please tell me the Grade of this product?
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This falls under the research grade.
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Hi, What is the shelf life for this product? Thanks
1 answer-
This product is not assigned an expiration date or recommended retest date. Products with no expiration date or recommended retest date should be routinely inspected by customers to ensure they perform as expected. These products are also subject to a one year warranty from the date of shipment. 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/life-science/quality-and-regulatory-management/quality-services.
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Which Pepsin do you recommend for histology/antigen retrevial? According to protocol 0.2mg/ml in 0.2M HCL
1 answer-
This product has not been specifically qualified for antigen retrieval, however, it may be able to be qualified for use by the end user. A typical protocol using pepsin for antigen retrieval suggests the following stock and working solutions:
Pepsin Stock Solution (1% in 10mM HCl):
Pepsin ------------------------------------- 100 mg
10mM HCl (pH 2.0) ---------------------- 10 mlMix to dissolve. Store at -20 ºC
Pepsin Working Solution (0.5% in 5mM HCl):
Pepsin Stock Solution (0.5%) ------------ 1 ml
Distilled water ---------------------------- 1 mlMix well.
For antigen retrieval - cover sections with pepsin working solution and incubate for 10-20 minutes at 37 °C in humidified chamber (optimal incubation time may vary depending on tissue type and degree of fixation, and should be determined by user).
Product R2283 is a pepsin product qualified for antigen retrieval https://www.sigmaaldrich.com/product/sigma/r2283.
For more information, please see the following link: https://www.sigmaaldrich.com/technical-documents/protocol/protein-biology/immunohistochemistry/immunohistochemistry-protocol#antigen_retrieval.
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