摘要:
Storage stable reduced nicotinamide-adenine-dinucleotide (NADH) compositions, which do not form dehydrogenase inhibitors of prolonged time periods, are produced by forming a dilute aqueous solution of inhibitor-free NADH and maintaining this solution in a thin layer vacuum.
摘要:
CARRIER-BOUND PROTEINS ARE PREPARED BY REACTING A PROTEIN IN AQUEOUS SOLUTION WITH A COMPOUND HAVING AT LEAST ONE EPOXY GROUP AND AT LEAST ONE ADDITIONAL FUNCTIONAL GROUP CAPABLE OF PRODUCING A BOND WITH A CARRIER MATERIAL, AND REACTING THE RESULTING PRODUCT WITH A CARRIER MATERIAL, OPTIONALLY FORMING THE CARRIER MATERIAL IN SITU BY POLYMERIZATION OF A MONOMER OR MONOMER MIXTURE.
摘要:
Compositions comprising glucose oxidase, peroxidase, a chromogen, a buffer, an azide, and 2,2''-azino-di-(3ethylbenzothiazoline-6-sulfonic acid) provide remarkably stable test reagents for the enzymatic determination of glucose.
摘要:
ENZYMATICALLY REACTIVE SUBSTANCES CONTAINED IN AQUEOUS SOLUTIONS ARE QUANTITATIVELY DETERMINED BY INTRODUCING A DEFINED AMOUNT OF A SOLUTION SAMPLE CONTAINING THE SUBSTANCE TO BE DETERMINED AND WHICH IS FREE OF AIR BUBBLES, INTO A STREAM OF BUFFER SOLUTION IN A BLOCK-LIKE FASHION, WHEREIN THE BUFFER SOLUTION CONTAINS THE REAGENTS NECESSARY FOR AN ENZYMATIC REACTION WITH SAID SUBSTANCES AND FLOWS WITH CONSTANT VELOCITY AND WHEREIN THE INTRODUCTION OF THE BLOCK SAMPLE DOES NOT SUBSTANTIALLY ALTER THE VELOCITY OF FLOW, CONTACTING THE RESULTING STREAM WITH THE APPROPRIATE ENZYME AND THEN PASSING THE STREAM OVER A DETECTOR TO INDICATE THE AMOUNT OF REACTION HAVING OCCURED, AND RELATING READINGS FROM THE DETECTOR TO THE AMOUNT OF THE SUBSTANCE TO BE DETERMINED CONTAINED IN THE SAMPLE.
摘要:
CREATININE AMIDOHYDROLASE AND CREATINE AMIDINOHYDROLASE ARE PREPARED BY A PROCESS COMPRISING CULTURING (A) ALCALIGENCE SPEC. WS 51400 OR (B) PENICILLIUM WS 90001; IN A CREATININE-CONTAINING MEDIUM, DIGESTING SAME, OBTAINING THE CREATININE AMIDIODOHYDROLASE IN SUBSTANTIALLY PURE FORM FROM THE WATER-SOLUBLE DIGESTION FRACTION AND, OPTIONALLY SEPARATING BY ION EXCHANGE CHROMATOGRAPHY ANY CREATININE AMIDINOHYDROSALE PRESENT.
WHEREIN R IS A HYDROGEN ATOM OR A (CH2)N-A RADICAL, IN WHICH N IS 2 OR 3 A IS A SULFO OR COR'' GROUP AND R'' IS HYDROXYL, ALKOXY CONTAINING FROM 1 TO 6 CARBON ATOMS OR PROPIONAMIDO; AND THE SALTS THERREOF ARE OUTSTANDINGLY EFFECTIVE ANTI-HYPERLIPEMIC AGENTS AND, PARTICULARLY, AS ANTI-CHOLESTEROL AGENTS.
摘要:
CREATININE AMIDOHYDROLASE AND CREATINE AMIDINOHYDROLASE ARE PREPARED BY A PROCESS COMPRISING CULTURING A MICROORGANISM IN A CREATININE-CONTAINING MEDIUM, DIGESTING SAME, OBTAINING THE CREATININE AMIDOHYDROLASE IN SUBSTANTIALLY PURE FORM FROM THE WATER-SOLUBLE DIGESTION FRACTION AND, OPTIONALLY SEPARATING BY ION EXCHANGE CHROMATOGRAPHY ANY CREATINE AMIDINOHYDROLASE PRESENT
摘要:
NUCLEOSIDE DIPHOSPHATE AND ITS ESTERS ARE PREPARED IN GOOD YIELD, WITH SHORT REACTION TIMES AND WITHOUT SUBSTANTIAL FORMATION OF BY-PRODUCTS, BY REACTING (A) A NUCLEOSIDE MONOPHOSPHATE AMIDATE COMPOUND OF THE FORMULA:
X-O-PO2-1-AM
IN WHICH X IS NUCLEOSIDE RESIDUE, AND AM IS A RADICAL OF THE FORMULA:
-N(-R1)-R2
WHEREIN R1 AND R2, WHICH CAN BE THE SAME OR DIFFERENT ARE HYDROGEN ATOMS OR ALKYL RADICALS CONTAINING UP TO 4 CARBON ATOMS OR WHEREIN R1 AND R2, TOGETHER WITH THE NITROGEN ATOM TO WHICH THEY ARE ATTACHED, FORM A HETEROCYCLIC RING, WHICH CAN CONTAIN A FURTHER HETEROATOM; (B) A PHOSPHORIC ACID COMPOUND OF THE FORMULA:
O3P2- -O-R
IN WHICH R IS HYDROGEN ATOM OR THE RESIDUE OF A HYDROXYL GROUP-CONTAINING ORGANIC COMPOUND; IN AN ALIPHATIC ALCOHOL OF FROM 1 TO 4 CARBON ATOMS OR IN A DIALKYL KETONE OF FROM 1 TO 3 CARBON ATOMS PER ALKYL GROUP OR IN DIMETHYL FORMAMIDE, AT A PH OF FROM ABOUT 1 TO 6.5.
摘要:
NUCLEOSIDE DIPHOSPHATE ESTERS ARE PREAPRED BY REACTING A NUCLEOSIDE MONOPHOSPHATE WITH A PHOSPHORIC ACID ESTER IN THE PRESENCE OF DICYCLOHEXYL CARBODIMIDE, WHEREIN A METHANOL SOLUTION OF A NUCELOSIDE MONOPHOSPHORIC ACID AND DICYCLOHEXYL CARBODIMIDE IS SLOWLY BROUGHT TOGETHER WITH A 1 TO 6.5 PH METHANOL SOLUTION OF A PHOSPHORIC ACID ESTER.
摘要:
Water insoluble biologically active proteins are bound on novel copolymers consisting of (a) acrylamide (b) ethylene-maleic acid or its anhydride and/or (c) maleic acid and/or its anhydride and (d) N,N''-methylene-bis-acrylamide or ethylene diacrylate in a weight ratio a:b:c:d of 3 : 0.5 - 1.5 : 0.05 - 4 : 0.075 - 0.9, the weight ratio a : (b + c) being not more than 4, to provide compositions which are outstanding in their ability to yield up the bound protein, and with which precise substrate reactions can be carried out.