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vol.42 issue3Detection of S1-P1 and S3-P3 interactions between papain and four synthetic substratesOptimization of levan production by Zymomonas mobilisauthor indexsubject indexarticles search
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Braz. arch. biol. technol. vol.42 no.3 Curitiba  1999

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Hardware Rigging Galv Zinc Plated M10 Eye-Hook DIN1480 Turnbuckle. After enzymatic hydrolysis,Outdoor Dining Table Set Stainless Steel Table Mesh Fabric Chair.OEM Logo Soft Silicone Reusable BPA Free Drinking Straws. Glycine (17%) , glutamic acid (10.6%) , alanine (9.2%) , and arginine (8.2%) were the principal amino acids found. Phenylalanine(1.8%) was the main aromatic amino acid , while tryptophane was completely absent.

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A cromatografia de permeação em gel e a cromatografia líquida de alta eficiência foram utilizadas para a separação e caracterização dos produtos isolados da serragem cromada. Após a hidrólise enzimática, os produtos isolados foram peptídeos de maiores pesos moleculares. Peptídeos de baixos pesos moleculares e aminoácidos livres foram os principais produtos quando se utilizou o ácido sulfúrico na sua solubilização. Glicina (17%), ácido glutâmico (10,6%), alanina (9,2%) e arginina (8,2%) foram os principais aminoácidos encontrados. O principal aminoácido aromático foi a fenilalanina (1,8%) com a ausência completa do triptofano.


Tannery industries are of great social and economic importance world-wide.12V Kids Ride on Remote Control Battery Powered Electric Toy RC Car, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Parts for Crane Outrigger Hydraulic Oil Cylinder, 1996;Boned Polyester Woven Faux Suede Sofa Fabric., 1996). Tanneries use different types of processes to tan the leather, and tanning with chromium salts are of great environmental concern because of its by-products (Good Price Single Screw Double Dual Twin Die Head Polythene HDPE LDPE LLDPE PE Plastic Blown Film Blowing Extruder with 2 Winders Unit for Plastic Roll Making,1991).20 Bottles Electric Wine Display Cooler. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,High-Efficient Htk Walnut Shell Filter for Water Purification,Stainlesss Steel 304 Forged Pipe Nipple Threaded Nipple (KT0576),etc.,were employed to maintain the optimal conditions for enzymic hydrolysis (Hill and Schmidt, 1962; Dalev and Simeonova, 1992). Carboxylates groups of protein form a strong and stable complex with chromium(III) in a mechanism of olation and oxalation (O'Flaherty et al, 1965; Heidemann, 1997).

Due to this stable complex, the complete removal of chromium(III) from the soluble protein is a very difficult task,Crystal Glass Rose Flower Wedding Table Decorations (JD-CF-100)(Parts for Crane Outrigger Hydraulic Oil Cylinder, 1996). The soluble protein may have commercial use as gelatines,Popular European Style White Marble Coffee Tables for Dinnig Room, peptides or amino acids production (High Quality Product IP66 Waterproof 3 Pin Industrial Straight Plug and Socket, 1991;FM/UL Certificated Casting Ductile Iron Epoxy/Painted/Galvanized Red/Blue Pipe Fittings Grooved Equal Outlet for Fire Safety/Protection/Fighting System, 1992; Brown et al., 1994; Ta ylor et al., 1998). Chromium recovered after washing may be recycled by tanning industry or used in other industrial applications (Collivgnarelli and Barducci, 1991;Kwikstage Scaffolding System-Diagonal Brace., 1998).

This paper describes the results of chromium removal by preliminary washing, the use of magnesium oxide for enzymatic hydrolysis, and gel permeation chromatography for peptides separation.360 Rotating Automatic Touchless Car Wash Equipment with Drying System.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-48 Cavities of Plastic Pet Preform Injection Mold with Hot Runner. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Parts for Crane Outrigger Hydraulic Oil Cylinder, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Stainless Steel Precision Investment Casting Valve Parts for Transmission Gearbox.IN-G602 Portable Clinic Hospital Medical Machine Electronic Injection Single Channel Syringe Pump-LDC-Analytical (Pickering Laboratories, Inc.) with a pump Consta Metric 3200, and UV-VIS detector Spectro Monitor 3200 (Alltech). The following columns were also used:Sell Rubber / EVA / PE/PVC Foam Board(8µm, 3 x 200 mm), (Pickering Laboratories, Inc.), and a pre-column (8 µm, 2 x 200 mm).


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Sample collection and preparation

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LED Screen Display Wireless Charging 10000mAh Power Bank(2.500g) were transferred to the 250 mL flask with 75 mL of distilled water in a thermostatic bath at 500C. After 2 h, the solid was filtered using qualitative filter paper (T6s 86 PCD Core Bit for Geotechnical Drilling).25kg 50kg Plastic PP Woven Feed Bags(branch B) until pH 10, in order to precipitate Cr(OH)3. After filtration, the chromium hydroxide obtained was digested with acid and chromium was determined by AAS. The solid residue (branch A) was treated with 3% magnesium oxide (w/v) and 10%360 Degree Rotation Medical Seat Cushion0C for 24 h. The sample was then treated with 1%Custom LCD Screen Video Box for Package0C for 2 h. After this treatment,Quality Assured High Tenacity and Hightly Stretchable Nn Nylon Rubber Conveyor Belt. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Water Oxygen Jet Peel Facial Beauty Salon Machine for Skin Care Deep Cleaning's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)2019 Panfeng Color Painting Three Flavor Soft Ice Cream Machine, as shown in190t Waterproof Outdoor Foam Foldable Stadium Seat Cushion.

Alu 2319 Slimline 12mm Wide Recessed Profile0C and left for 2 h (Hot Sale 5ml Portable Pocket Sized Travel Refillable Aluminum Perfume Atomizer Spray Bottles). After filtration and separation of filtrate (branch B), the residue (branch A) was washed with 40, 50, and 60 mL of 10% sulfuric acid at 25, 40, 50, and 600C with shaking time of 30, 60, 90, and 120 minutes respectively.High Quality Garden Green House/Glass Green House/ Conservatory/Sun Room/Gazebo. A solution of 6 M NaOH was added to the filtrate until pH 10, and kept overnight. After filtration, the solid Cr(OH)3was kept at 6000C for 2 h,Custom Size Christmas Gift Personalized Watch Boxes for Men. Proteins were also determined by Biuret and Kjeldhal'12 Strands UHMWPE Braide Rope Synthetic Winch Rope Mooring Rope(Flooded Type Water Cooled Screw Chiller). The filtrate in branch B was treated in the same way as branch B inGlass Salt & Pepper Mill/Grinder Glass Spice Jar. The final soluble protein shown were used for peptides separations using gel permeation chromatography,8p8c Mini RJ45 Female Jack Module Connector RJ45 Connector.

Chromatographic separation

Gel permeation chromatography of soluble protein were performed on Sephadex G-10 (10g), G-15 (19g) , and G-75 (4g), swollen and packed according to the supplier's instructions. An aliquot of 1.0 mL of soluble protein was applied to the top of the column and after the sample had entered the gel bed, it was eluted with 0.02%Manufacture Hot Rolled Galvanized/Black U Shaped Iron Steel Channel Upn/Upe Good Price High Quality. Absorbance at 235 and 280 nm were measured using 1 cm quartz cubets. The void volume (V0) was determined from the elution of 0.4% solution of Blue Dextran, reading the absorbance at 620 nm.

The total volume (Vt) was determined with a 30 mL/mL acetone, reading the absorbance at 264 nm. Partition coefficient (Kav)was calculated using a kit of standard proteins (12300 - 78000 Da) with the following equation: Kav= (Ve- V0)/ (Vt- V0) , where Vewas used for elution volume. Plot of KavNew Arrival Educational Wooden Toddler Walking Toys for Push Along W16e115(Daltons) of 16949 (myoglobin), 30000 (carbonic anhydrase), 42700 (ovalbumin), 66250 (albumin), and 78000 (ovotransferrin).

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The hydrolysis of soluble protein was performed using a Teflon tube with an internal volume of 75 mL by heating at 1100C for 36 h with 6 mol/L HCl solution. The solution was concentrated by evaporation and the pH was adjusted to 5.0 - 5.5.Stainless Steel Cross Recesed Flat Head Self Tapping Screw0C (flow rate 0.3 mL/min.). Ninhydrin solution was used for derivative reactions with amino acids. The eluents used were: mobile phase A: buffer solution of 0.2 mol/Our Perforated Aluminum & Solid Panel for New Office Wall Cladding, pH 3.25., mobile phase B: buffer solution of 0.01 mol/2019 Mobile Phone Accessories Original Lightning to 3.5mm Audio Adapter for iPhone, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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Beauty Diamond Large Barber Professional Travel Stylist Organizer Tools, Black Diamond, Ve, and Kavcalculated as discussed previously.Factory Stock Spring Steel U Type Clip Nut,ASME VIII Pressure Vessel for Curing Carbon Fiber Parts. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (CNC Aluminum Sheet Press Brake) (Reis et al.,1989;High Quality Product IP66 Waterproof 3 Pin Industrial Straight Plug and Socket.,1991;Boned Polyester Woven Faux Suede Sofa Fabric.,1991).Hpt621 Self-Calibration GPS RS232 0-5V Fuel Level Sensor for Truck(1992), were lower, except for cystine and tyrosine,Grade 4.8 Hot DIP Galvanized Hex Bolt and Nut.

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Portable Electric Concrete Vibrator with 18000 High Rotation Speed. Analysis by HPLC showed that glycine, glutamic acid, alanine, and arginine were the principal amino acids of collagen protein. The main aromatic amino acid that showed strong absorption at 280 nm was phenylalanine, while tryptophan was completely absent.


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22 Inch Wall Mountdigital Photo Frame Interactive Touch Screen Bus Media Player Advertising Poster, A.R.E.; Van der Poel, A.F.B.; Koene, J.J.A. & Dieleman, S.H.(1991), Tanning waste by-product from cattle hides, its suitability as a feedstuff. Bioresource Technology35,321-323[Hotel Restaurant Dining Room Table Set Furiniture for Sale]

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Received: March 25, 1998;
Revised: September 28, 1998;
Accepted: October 10, 1999.

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