Primary Drinking Water Metals Ricca Chemical; 100mL; Amber poly; CAS: 7697-37-2 (Nitric Acid), 7732-18-5 (Water, Deionized); 1/EA Exact Match RWAT7100

SIGMA-ALDRICH CORPORATION Part No. P7125-500G
Synonym: Pepsin A, Pepsin from hog stomach CAS Number: 9001-75-6 EC Number: 232-629-3 Enzyme Commission (EC) Number: 3.4.23.1 MDL Number: MFCD00081840 Analysis Note Optimum pH is 2-4. Active in 4 M urea and 3 M guanidine HCl. Stable at 60 ÝC. Pepsin is irreversibly inactivated at pH 8.0 - 8.5. Protein determined by E1%/280 Application Used to produce F(ab')2 fragments of antibodies. Pepsin is a peptidase used to digest proteins and is commonly used in the preparation of Fab fragments from antibodies. Pepsin, from porcine gastric mucosa, has been used to hydrolyze dry cervical samples in mice. Product P7125 is provided in powder form. Product P7125 has been used to denature DNA from kidney cells 1 and to digest pathology samples from anal canal carcinomas (ACC) biopsies prior to EGFR staining 2 . Unit Definition One unit will produce a ?A ₂₈₀ of 0.001 per min at pH 2.0 at 37 ÝC, measured as TCA-soluble products using hemoglobin as substrate. (Final volume = 16 mL. Light path = 1 cm.) Biochem/physiol Actions Pepsin hydrolyzes peptide bonds, not amide or ester linkages. Pepsin cleaves peptides with an aromatic acid on either side of the peptide bond. Sulfur-containing amino acids increase susceptibility to hydrolysis when they are close to the peptide bond. Pepsin preferentially cleaves at the carboxyl side of phenylalanine and leucine and at the carboxyl side of glutamic acid residues. Cleaves Phe-Val, Gln-His, Glu-Ala, Ala-Leu, Leu-Tyr, Tyr-Leu, Gly-Phe, Phe-Phe and Phe-Tyr bonds in the _ chain of insulin. Pepsin is the major proteolytic enzyme produced in the stomach. It digests proteins through the cleavage of interior peptide linkages. 3 Preferential cleavage: hydrophobic and aromatic residues in P1 and P1' postitions. Cleaves Phe-Val, Gln-His, Glu-Ala, Ala-Leu, Leu-Tyr, Tyr-Leu, Gly-Phe, Phe-Phe and Phe-Tyr bonds in the _ chain of insulin. Pepsin is the major proteolytic enzyme produced in the stomach. It digests proteins through the cleavage of interior peptide linkages. 3

SIGMA-ALDRICH CORPORATION Part No. PVP40-500G
Synonyms: PVP; Polyvidone; Povidone Formula: (C₆H₉NO)_n
CAS No.: 9003-39-8 Application: Complexes with phenolics and alkaloids for their removal from plant samples, thus preventing their modification of proteins and any interference they may cause in spectrophotometric determinations of protein content. This is also reported to improve stability of enzymes. Other Notes: Polyvinylpyrrolidone is a component of Denhardt′s Solution and is included at a concentration of 1% (w/v) in the standard 50X stock solution. Packaging: 1 kg in poly bottle Packaging: 5 kg in poly drum Packaging: 50, 100, 500 g in poly bottle

SIGMA-ALDRICH CORPORATION Part No. 702587-250G
Chemical synonyms: Potassium hexacyanoferrate(III); Red prussiate Density (g/cm3): 1.14 Molecular formula: K3Fe(CN)6 Chemical purity: 0.99 Potassium ferricyanide(III) is a potassium salt widely employed as an external indicator in potassium dichromate titrations. A sensor containing potassium ferricyanide assisted enzyme electrode for estimating maltose and glucose in samples has been reported. Addition of potassium ferricyanide in the catholyte can improve the generation of power in microbial fuel cells (MFCs).

SIGMA-ALDRICH CORPORATION Part No. 77399-2.5L
Synonyms: Petroleum benzin
CAS No.: 101316-46-5 Density: 0.63 g/mL at 20 ÝC

also know as Di (2-ethylhexyl) phosphoric acid

SPECTRUM CHEMICALS & LABORATORY PROD Part No. P1014-4LTGL
Grade: Technical
CAS No.: 109-66-0 UN No.: UN1265 Class: 3 Pkg. Group: PG II

Agilent Technologies, Inc.
Mfg Item # : 5063-6589
Pump seals should be replaced when there are leaks on the bottom of the pump head, when retention times are inconsistent, or when the pressure ripple is unstable. Each time the seals are replaced, the pistons (plungers) should be examined for scratches. Scratched pistons will cause small leaks and can damage the seals.

VWR International BDH7346-1
o-Phosphoric Acid, Solution 10%, v/v (1+9) 1 L Made with deionized water.