Product Description
| Name |
Ponceau S |
| Synonyms |
C.I. 27195; 3-Hydroxy-4-[2-sulfo-4-(4-sulfophenylazo)phenylazo]-2,7-naphthalenedisulfonic acid tetrasodium salt |
| |
| Molecular Structure |
|
| Molecular Formula |
C22H12N4Na4O13S4 |
| Molecular Weight |
760.57 |
| CAS Registry Number |
6226-79-5 |
| EINECS |
228-319-2 |
| |
Properties
| Water solubility |
10 g/L |
Chemical Property/Description:
Bordeaux red to dark red or brown powder,Ponceau S is negatively charged and can bind to positively charged amino acid residues, while ponceau can also bind to non-polar regions of proteins to form red bands. The staining of proteins by Ponceau S is reversible and can be washed away with distilled water, PBS, or other appropriate solutions.
Main Uses:
Biological staining, protein staining after electrophoresis. Ponceau S can be used to detect proteins attached to NC and PVDF membranes, but cannot be used for Nylon membranes.
Determination of Cu in food by ponceau S probe dual wavelength absorption spectrometry. In TRIS-hydrochloric acid buffer medium at pH 6.86, ponceumin S reacts with Cu(2) to form an ion association with an obvious positive absorption peak and a clear negative absorption peak in the visible region. The positive and negative absorption wavelengths are 445 nm and 510 nm, respectively. Cu(2) follows Lambert-Bier's law in 0.06~1.6 mg/L(positive absorption, 445 nm), 0.04~1.6 mg/L(negative absorption, 510 nm) and 0.03~1.6 mg/L(DWO-VIS, 445 nm+510 nm). The apparent molar absorptivities (κ) were 8.70× 10-3 (positive absorption), 2.04× 10-4 (negative absorption) and 2.92× 10-4 (DWO-VIS)L/(mol·cm), respectively. The limits of quantitation were 0.62, 0.38 and 0.26 mg/100 g, respectively. The effects of absorption spectra, suitable reaction conditions and co-existing substances were also discussed. The dual-wavelength method was used to determine Cu in biscuits, noodles and milk powder. The recoveries were 97.9%-102% and the relative standard deviations (RSD) were 2.5%-2.8% (n=5).
Detailed Photos
FAQ
FAQ
Question 1: Can I get samples?
Answer: Yes,you can get free samples of our most products,
while the courier cost will be borne by the buyers.
Question 2: What's your MOQ?
Answer: For a express delivery order,the MOQ is usually 100 g~1 kg;
for an air transport order or sea delivery order ,the MOQ is usually 25 kgs.
Question 3: What's your delivery time?
Answer:
Orders shipped by express delivery,the delivery time is usually 5~7 working days;
Orders shipped by air transport,usually around 7~10 working days;
Orders shipped by sea , usually around 2~3 working weeks.
Question 4: What are the different payment methods?
Answer: We usually accept T/T, L/C and Western Union.
Question 5: How do you treat quality complaint?
We take quality very seriously, it is one of the founding principles of our business.
If the quality problem actually exists, we will replace with qualified goods or refund the money.
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