Extract, Liebig

V-(3-Bromopropyl)phthalimide [5460-29-7] M 268.1, m 72-74 , 74 . Place in a Soxhlet and extract with Et20, whereby the bis-phthalimido impurity is not extracted. Evaporate the Et20 and recryst from EtOH or aqueous EtOH or pet ether. [Chem Ber 21 2669 1888 Justus Liebigs Ann Chem 614 83 1958 Can J Chem n 1060 7955.]... 

Benzaldehyde-2-sulfonic acid sodium salt [1008-72-6] M 208.2, m dec on heating. Forms prisms or plates by extracting with boiling EtOH, filtering, evaporate to dryness and recrystallise the Na salt from a small volume of H2O. The N-phenylhydrazone sodium salt recrysts from H2O, m 174.5°. [Gnehm and Schiile Justus Liebigs Ann Chem 299 363 1898.]... 

Catalytic activities in plant extracts were also recognized early in the nineteenth century. Robiquet and Boutron (1830), for example, noted the hydrolysis of amygdalin, a glycoside in the seeds of bitter almonds Robiquet, and Liebig and Wohler then identified the enzyme responsible—emulsin. 

Meat extracts are more or less concentrated aqueous extracts of muscular flesh freed from coagulable albuminoid substances. They contain, therefore, in a more or less reduced volume, all the water-soluble principles of lean meat, and they have the appearance of a stiff, reddish-brown mass, with a rather bitter taste and a peculiar, not unpleasant odour Liebig s extract type). 

Analysis of meat extract has the same objects as that of fresh meat or sausages, namely, to determine the composition and nutrient value of the extracts and to detect adulterations and preservatives. With extracts of the Liebig type, determinations should always be made of the water, ash, potassium, fat and total nitrogen, while tests should be made for nitre and preservatives. Further, it is always useful to determine the various forms of combination of the nitrogen, especially the creatinine and the ammonia see 7, 8 and 9, below). In mixed extracts, besides determinations of the... 

Alcoholic Extract, according to Liebig.—Liebig s original method for determining the substances insoluble in 80% alcohol, which has been much discussed, is as follows ... 

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