scholarly journals Purification of soluble arylsulphatases from ox brain

1965 ◽  
Vol 97 (2) ◽  
pp. 360-364 ◽  
Author(s):  
W Bleszynski ◽  
LM Dzialoszynski
Keyword(s):  
Ammonium Sulphate ◽  
Specific Activity ◽  
Ammonium Sulphate Precipitation ◽  
Optimum Ph ◽  
Arylsulphatase A

1. Two soluble arylsulphatases (A and B) have been extracted from ox brain by a modified Albers autolysis method and purified by acetone and ammonium sulphate precipitation and dialysis. 2. A 1600-fold purification was achieved with arylsulphatase A and 320-fold purification with arylsulphatase B. 3. The specific activity of arylsulphatase A was 266000 4-nitrocatechol units/mg. of protein N, and that of arylsulphatase B was 64600units/mg. of protein N. 4. Arylsulphatase A seems to be electrophoretically homogeneous. 5. With 3mm-dipotassium 2-hydroxy-5-nitrophenyl sulphate as substrate the optimum pH for the activity of arylsulphatase A was 4.7, and for arylsulphatase B it was 6.1 with a 60mm solution of the same substrate.

scholarly journals Bromelain Activity of Waste Parts of Two Pineapple Varieties

2018 ◽  
Vol 2 ◽  
pp. 21-28 ◽  
Author(s):  
Edmund Ofosu Benefo ◽  
Isaac Williams Ofosu
Keyword(s):  
Enzyme Activity ◽  
Ammonium Sulphate ◽  
Crude Extract ◽  
Specific Activity ◽  
High Demand ◽  
Digestion Method ◽  
Waste Products ◽  
Food Industries ◽  
Ethanol Precipitation ◽  
Ammonium Sulphate Precipitation

Bromelain, a protease found in pineapples, is of high demand in the pharmaceutical, cosmetic and food industries. Along the pineapple processing chain, waste products such as peels, crowns, stems and cores result. These parts are usually discarded, though they contain significant amounts of the enzyme bromelain. This study sought to determine the bromelain activity of the crowns and peels of two pineapple varieties grown in Ghana;MD2andSugarloaf. The crude extract was obtained by homogenising the peels and crowns in a cold phosphate buffer and centrifuging at 3000 rpm for 15 min. Ethanol and ammonium sulphate precipitation were carried out on the extract between 30% – 80% precipitation levels. The enzyme activity was determined using the casein digestion method. Results showed that bromelain was precipitated mainly in the 30% – 60% precipitation range.Sugarloafcrowns yielded the highest enzyme activity of 20.82 U/ml and a specific activity of 194.58 U/mg at the 40% ammonium sulphate precipitation level. This was followed by theSugarloafpeels with an enzyme activity of 19.98 U/ml at 50% ethanol precipitation level. Ethanol precipitation resulted in fractions with lower bromelain activity. Enzyme activity was higher in theSugarloafvariety and also in the crowns of both varieties. The two pineapple varieties have significant levels of bromelain activity and could be exploited for commercialisation.

STUDIES ON THE PURIFICATION OF BOVINE PLASMINOGEN (PROFIBRINOLYSIN)

1960 ◽  
Vol 38 (1) ◽  
pp. 1029-1034 ◽  
Author(s):  
Arthur Dalby ◽  
Edmond R. Cole ◽  
Edwin T. Mertz
Keyword(s):  
Calcium Phosphate ◽  
Ammonium Sulphate ◽  
Bovine Serum ◽  
Specific Activity ◽  
Gel Chromatography ◽  
Isoelectric Precipitation ◽  
Ammonium Sulphate Precipitation ◽  
Ph Range

A crude bovine plasminogen product obtained from bovine serum by 30% ammonium sulphate precipitation has been purified 20-fold by means of isoelectric precipitation and calcium phosphate gel chromatography. A threefold purification was achieved by isoelectric precipitation. Plasminogen was precipitated in greatest yield and highest specific activity at 40-fold dilution in the pH range of 5.25–5.50. The conditions under which plasminogen is eluted from calcium phosphate gel columns have been investigated. Plasminogen fractions possessing specific activity seven times that of the isoelectric-precipitated materials have been obtained by elution with phosphate buffers over the range of 0.05 to 0.1 M, pH 6.8.

Meta-Methylation of Flavonol Rings A (8-) and B (3'-) Is Catalysed by Two Distinct O-Methyltransferases in Lotus corniculatus

1983 ◽  
Vol 38 (5-6) ◽  
pp. 413-417 ◽  
Author(s):  
Maurice Jay ◽  
Vincenzo De Luca ◽  
Ragai Ibrahim
Keyword(s):  
Ammonium Sulphate ◽  
Biochemical Markers ◽  
Flower Colour ◽  
Lotus Corniculatus ◽  
The Other ◽  
Flower Buds ◽  
Ph Optimum ◽  
Genetic Studies ◽  
Ammonium Sulphate Precipitation ◽  
Optimum Ph

Two O-methyltransferases specific for flavonol rings A and B were isolated from young flower buds of Lotus corniculatus. They were partially purified by ammonium sulphate precipitation and successive chromatography on Sephadex G-100 and Polybuffer ion exchanger. One enzyme focused at pI 5.5 and catalysed the O-methylation of position 8 of flavonols with a pH optimum of 8.1. The other enzyme had a pi of 5.1 and preferentially attacked position 3' at an optimum pH of 7.7. The methylated products of both enzymes seem to contribute to the flower colour of Lotus and may be used as biochemical markers in genetic studies of this genus.

THE DEVELOPMENT OF A RADIOIMMUNOASSAY FOR OXYTOCIN: RADIO-IODINATION, ANTIBODY PRODUCTION AND SEPARATION TECHNIQUES

1970 ◽  
Vol 46 (2) ◽  
pp. 269-278 ◽  
Author(s):  
T. CHARD ◽  
M. J. KITAU ◽  
J. LANDON
Keyword(s):  
Lymph Node ◽  
Human Plasma ◽  
Rapid Method ◽  
Ammonium Sulphate ◽  
Antibody Production ◽  
Specific Activity ◽  
High Specific Activity ◽  
Separation Techniques ◽  
Ammonium Sulphate Precipitation

SUMMARY A simple and rapid method is described for labelling oxytocin with 131I at a high specific activity. This method is compared with those of previous workers. A satisfactory antiserum has been raised by direct intra-lymph node injection of oxytocin adsorbed to carbon microparticles. A number of methods for separating antibody-bound from free oxytocin are described, and reasons given for preferring a procedure using ammonium sulphate precipitation. These data form the basis for developing a radioimmunoassay intended for the determination of oxytocin in human plasma.

Purification of a Fibrinolytic Enzyme from Bacillus Sp. Isolated from Budu

2012 ◽  
Vol 59 (1) ◽  
Author(s):  
Nurulhanis Ahmad Sanusi ◽  
Haryati Jamaluddin
Keyword(s):  
Ammonium Sulphate ◽  
Specific Activity ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Culture Broth ◽  
Fibrinolytic Enzyme ◽  
Total Protein Content ◽  
Bacillus Sp ◽  
Ammonium Sulphate Precipitation ◽  
Sds Page

Bacillus sp. strain B1 producing wild type fibrinolytic enzyme was isolated from Budu. The fibrinolytic enzyme was collected from the supernatant of Bacillus sp. strain B1 culture broth and purified to electrophoretic homogeneity through a combination of various purification schemes, which include ammonium sulphate precipitation, followed by anion exchange chromatography using DEAE–Sepharose Fast Flow and gel filtration chromatography on Sephadex G–75 column. During ammonium sulphate precipitation screening, it was observed that the crude enzyme from Bacillus sp. strain B1 precipitated at 40% and 50% of ammonium sulphate saturation respectively. The fibrinolytic enzyme was purified 58.5–fold with a final yield of 0.51%. The specific activity was determined to be 1.17 Units/mg using plasmin as standard and the final total protein content was 8.58 mg/ml. After the successive purification steps, the estimated molecular mass of fibrinolytic enzymes from strain B1 was estimated via sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS–PAGE). SDS–PAGE analysis showed a single band at 45 kDa corresponding to the purified fraction with fibrinolytic activity.

STUDIES ON 17β-HYDROXYSTEROID DEHYDROGENASE IN HUMAN ENDOMETRIUM AND ENDOMETRIAL CARCINOMA

1975 ◽  
Vol 80 (2) ◽  
pp. 355-364 ◽  
Author(s):  
K. Pollow ◽  
H. Lübbert ◽  
B. Pollow
Keyword(s):  
Endometrial Carcinoma ◽  
Ammonium Sulphate ◽  
Isoelectric Focusing ◽  
Hydroxysteroid Dehydrogenase ◽  
Maximal Velocity ◽  
Optimum Temperature ◽  
Ammonium Sulphate Precipitation ◽  
Optimum Ph ◽  
Triton X ◽  
Secretory Endometrium

ABSTRACT Microsomal 17β-hydroxysteroid dehydrogenase obtained from the human secretory endometrium (17β-HSD) was solubilized with triton X-100. A 4-fold purification was achieved by ammonium sulphate precipitation and isoelectric focusing. In the presence of glycerol the partially purified enzyme was stable at 4°C for at least 48 h. Using crude microsomes, the conversion of oestradiol to oestrone was linear with time and with the concentration of protein. The optimum temperature was approximately 40°C and the optimum pH 9.4. For the reduction of oestrone the optimum pH was 6.5. With NAD, oestradiol was oxidized approximately three times more rapidly than with NADP. Km-values for oestradiol were nearly the same in endometrial carcinoma and in proliferative and secretory endometrium (i. e. approximately 3 × 10−6 m). The maximal velocity was highest in secretory endometrium. Testosterone and androstenedione could also serve as substrates but they were interconverted more slowly than oestradiol and oestrone. Sulphhydryl groups were shown to be essential for catalysis.

scholarly journals Biobleaching of Industrial Important Dyes with Peroxidase Partially Purified from Garlic

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Akudo Chigozirim Osuji ◽  
Sabinus Oscar O. Eze ◽  
Emmanuel Emeka Osayi ◽  
Ferdinand Chiemeka Chilaka
Keyword(s):  
Ammonium Sulphate ◽  
Specific Activity ◽  
Low Cost ◽  
Gel Filtration ◽  
Enzyme Concentration ◽  
Gel Filtration Chromatography ◽  
Vat Dyes ◽  
Ammonium Sulphate Precipitation ◽  
Ph Range ◽  
Better Than

An acidic peroxidase was extracted from garlic (Allium sativum) and was partially purified threefold by ammonium sulphate precipitation, dialysis, and gel filtration chromatography using sephadex G-200. The specific activity of the enzyme increased from 4.89 U/mg after ammonium sulphate precipitation to 25.26 U/mg after gel filtration chromatography. The optimum temperature and pH of the enzyme were 50°C and 5.0, respectively. The Km andVmaxfor H2O2and o-dianisidine were 0.026 mM and 0.8 U/min, and 25 mM and 0.75 U/min, respectively. Peroxidase from garlic was effective in decolourizing Vat Yellow 2, Vat Orange 11, and Vat Black 27 better than Vat Green 9 dye. For all the parameters monitored, the decolourization was more effective at a pH range, temperature, H2O2concentration, and enzyme concentration of 4.5–5.0, 50°C, 0.6 mM, and 0.20 U/mL, respectively. The observed properties of the enzyme together with its low cost of extraction (from local sources) show the potential of this enzyme for practical application in industrial wastewater treatment especially with hydrogen peroxide. These Vat dyes also exhibited potentials of acting as peroxidase inhibitors at alkaline pH range.

STUDIES ON THE PURIFICATION OF BOVINE PLASMINOGEN (PROFIBRINOLYSIN)

1960 ◽  
Vol 38 (9) ◽  
pp. 1029-1034 ◽  
Author(s):  
Arthur Dalby ◽  
Edmond R. Cole ◽  
Edwin T. Mertz
Keyword(s):  
Calcium Phosphate ◽  
Ammonium Sulphate ◽  
Bovine Serum ◽  
Specific Activity ◽  
Gel Chromatography ◽  
Isoelectric Precipitation ◽  
Ammonium Sulphate Precipitation ◽  
Ph Range

A crude bovine plasminogen product obtained from bovine serum by 30% ammonium sulphate precipitation has been purified 20-fold by means of isoelectric precipitation and calcium phosphate gel chromatography. A threefold purification was achieved by isoelectric precipitation. Plasminogen was precipitated in greatest yield and highest specific activity at 40-fold dilution in the pH range of 5.25–5.50. The conditions under which plasminogen is eluted from calcium phosphate gel columns have been investigated. Plasminogen fractions possessing specific activity seven times that of the isoelectric-precipitated materials have been obtained by elution with phosphate buffers over the range of 0.05 to 0.1 M, pH 6.8.

scholarly journals Isolasi dan Karakterisasi Protease Ekstraseluler dari Bakteri dalam Limbah Cair Tahu

2012 ◽  
Vol 10 (2) ◽  
pp. 83 ◽  
Author(s):  
Amin Fatoni ◽  
Zusfahair Zusfahair ◽  
Puji Lestari
Keyword(s):  
Ammonium Sulphate ◽  
Metal Ion ◽  
Specific Activity ◽  
Liquid Waste ◽  
Industrial Process ◽  
Inhibitory Effect ◽  
Enzyme Characterization ◽  
Waste Sample ◽  
Ammonium Sulphate Precipitation ◽  
Large Application

Protease has been used in large application industrial process such as detergent, leather, textil, softdrink, andmedicine. In order to find unique protease, many substances were explored as proteases of bacteria sources. Inthis study, tofu liquid waste was used as a source of bacteria producing proteases. Waste sample was growth inskim milk agar medium showing proteases activity, it was used to produce extracellular protease. The microbialcolonies were identified as Staphyllococcus sp. Protease was extracted with 5000 g centrifugation at 4 0C, andpurificated with ammonium sulphate precipitation continued with dialisis. Optimum production time, pH, metal ion,EDTA, specific activity, KM, and Vmaks were studied for enzyme characterization. Volume of crude enzyme was 300ml, with spesific activity of 3.55 U/mg. Protease obtained from 60% ammonium sulphate fraction had the highestspecific activity of 68.22 U/mg. Study on the protease characterization revealed that optimum temperature of thisenzyme was 400C. The optimum pH of the enzyme was found to be 8.0. The kinetic parameters K M dan Vmaks withcasein as substrate were 0.31% and 51.55 U/ml. Some inhibitory effect was observed in the presence of EDTA, Cu +2,Co+2, Zn+2, and enzyme activity was stimulated by Mg+2, indicating that this ion had a functional role in the molecularstructure of the enzyme.

PARTIAL PURIFICATION OF BOVINE ANTIPLASMIN (ANTIFIBRINOLYSIN)

1960 ◽  
Vol 38 (9) ◽  
pp. 1021-1027
Author(s):  
Edmond R. Cole ◽  
Arthur Dalby ◽  
Edwin T. Mertz
Keyword(s):  
Calcium Phosphate ◽  
Ammonium Sulphate ◽  
Bovine Serum ◽  
Specific Activity ◽  
Large Diameter ◽  
Small Diameter ◽  
Partial Purification ◽  
Isoelectric Precipitation ◽  
Ammonium Sulphate Precipitation ◽  
Column Eluate

Bovine antiplasmin (antifibrinolysin) solutions with activities of 12–19 units/mg nitrogen have been obtained from bovine serum by 60% ammonium sulphate precipitation and isoelectric precipitation at pH 5.0 representing approximately a 6-fold purification of antiplasmin from serum. An additional 6.4-fold purification of antiplasmin was obtained by chromatography on a large diameter calcium phosphate gel column. Dialysis and lyophilization of the column eluate caused a 30% loss in activity. The dry antiplasmin was 25 times more potent than serum protein and was stable for 12 months when stored in a desiccator over P2O5 at −10°. Antiplasmin solutions with a specific activity twice that obtained with the large column could be eluted from a small diameter calcium phosphate column, but the activity decreased too rapidly to permit preparation of a lyophilized product.

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