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1262883-33-9

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1262883-33-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1262883-33-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,6,2,8,8 and 3 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1262883-33:
(9*1)+(8*2)+(7*6)+(6*2)+(5*8)+(4*8)+(3*3)+(2*3)+(1*3)=169
169 % 10 = 9
So 1262883-33-9 is a valid CAS Registry Number.

1262883-33-9Downstream Products

1262883-33-9Relevant articles and documents

Synthesis of fluorescein aromatic esters in the presence of P 2O5/SiO2 as catalyst and their hydrolysis studies in the presence of lipase

Eshghi, Hossein,Mirzaie, Narges,Asoodeh, Ahmad

, p. 120 - 126 (2011)

A series of fluorescein aryl esters were synthesized by the esterification of fluorescein with carboxylic acids in the presence of P2O 5/SiO2 and their hydrolytic properties were investigated. The rate of hydrolysis in the presence or absence of lipase, due to the increase of fluorescein concentration, was measured by monitoring of fluorescence of the solution and correlated with enzyme activity. In addition, the substitute effect on the aromatic ring of fluorescein esters was studied. In contrast to fluorescein diacetate or dibutyrate, fluorescein dibenzoate and fluorescein bis(4-methylbenzoate) were found to be better substrates for the fluorometric assay of lipase with the higher rate of hydrolysis and better Km value, respectively. As little as 9.3 ng mL-1 of lipase can be detected with fluorescein bis(4-methylbenzoate).

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