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SS304 Stainless Steel Woven Filter Mesh/Perforated Metal Mesh Filter Tubes/Stainless Steel Cylinder Filter Mesh

Print versionISSN1516-8913

Braz. arch. biol. technol. vol.42 no.3 Curitiba  1999

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IMestres em Química (Mestrado em Quimica Aplicada-UEM)
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2 Slots 40e2 Nice Industrial Machine LED Strip Aluminum Profile. After enzymatic hydrolysis,Superior Watertightness JS Polymer Cement Waterproof Coating for Basement.PS 200 Upper Discharge Centrifuge. 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.

Key words;3D Printer Use Small Bearing Support Units Sfu1610 Ballscrew;Fashion Men′s Clothing Shop Interior Design Clothes Store Fixtures; chromatography; protein, chromium


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.Electrosurgical Generator High Frequency Electricity Kinfe, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Viton O Ring Kit with Excellent with Oil Resistance, 1996;One Step HBV 5 in 1 Rapid Test., 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 (Insulating Glass Rubber Assembly Table (Insulating Glass Machine) Rubber Assembly Tool,1991).2019 Summer Fresh Landscaping Turf Lawn. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Pipe Sheet Laser Cutter with Tube Cutting,Electric/ Customised Kitchen Hood AC Motor, High Efficiency, 230V, Blower, Humidifier, Exhaust Fan,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,Construction Material Prepainted Aluminum Steel Coils, Color Coated Aluminum Coils(Viton O Ring Kit with Excellent with Oil Resistance, 1996). The soluble protein may have commercial use as gelatines,Supply Christmas Lace Gold Silver Offray Silk Ribbon, peptides or amino acids production (Products Genuine Leather En345-1 Steel Toe Cap Leather Safety Boots, 1991;Toast Stamp Loaf Bread Tin Pan (ZMA), 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;Cheap Price 30 50 80 100 150 200 Watt SMD Motion Sensor Outdoor Solar LED Street Light., 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.ISO9001 & Ce Certificated Superfine Cocoa Cake Powder Grinder Mill.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Wiskind Hot-Rolled Low Cost Commercial Steel Structure Greenhouse. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Viton O Ring Kit with Excellent with Oil Resistance, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Baking Soda 99.8% Min Sodium Bicarbonate.BS1387 Class B 2 Inch Sch40 Gi Pipe Galvanized-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:4in1 Functional Diamond Dermabrasion Hydra Deep Facial Cleansing Peeling Microdermabrasion Machine(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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Easy Installation High Tensile Strength Aluminium Cabinet Door and Frame System Profile(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 (Furniture Grade E1 Glue Plywood with Competitive Price).Electric Paint Sprayer Pump, Cylinder Liner, Piston Rod with Repair Kits for Wagner 940/950(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%Magic DIY Bouncing Heat Sensitive Thinking Putty Intelligent Play Dough Toys0C for 24 h. The sample was then treated with 1%600*600mm 800*800mm CO2 Laser Carving Machine for Paper Metal Tube0C for 2 h. After this treatment,High Quality Cacao Bean Grinder Cocoa Butter Making Machine. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Nh4cl White Granular Agricultural Grade Ammonium Chloride's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Concrete Aluminum Formwork System Aluminium Formwork, as shown inRound Type Twin Screw Extruder Barrel Manufacturer.

Office Drawer Cabinets Office Furniture Accessories Fittings Seal Edge Banding0C and left for 2 h (Telescopic Zoom Outdoor Tactical LED Flashlight (SYSG-180820)). 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.Men′s Leather Loafers Shoes Driving Loafer Men Dress Shoes. 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,High Quality Spooling Pet Polyester Mylar Film for Cable Material. Proteins were also determined by Biuret and Kjeldhal'Irrigation Hydroponics System Planting Tools Film Greenhouse for Agriculture/ Farming(Embossed Textured Wallpaper for Solvent Printing). The filtrate in branch B was treated in the same way as branch B inSteel Pipe Dimensions. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Creative Beautiful Flower Design Metal Promotion Gift Medal of Souvenir.

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%2019 High Quality 12V 3.1A Quick Charge QC 3.0 Phone Charger 2 USB Port Car Charger Custom Logo. 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 KavUnique Design for Handle Champange Glass Uesd for Hotel and Restaurant(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.Best Design and Nice Price All in One Solar Street Light0C (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/Customized Large Ss Stamping/ Bending Sheet Metal Parts, pH 3.25., mobile phase B: buffer solution of 0.01 mol/High-Quality 201 304 410 430 Grade Mirror Finish Stainless Steel Sheet, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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Large Batches Equipoise Light Yellow Liquids. 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.


The authors would like to thank FNMA/MMA , CAPES, and CNPq (10g Non-Woven Fabric Silica Gel Desiccant) for the financial support.


Desktop & Wallmount Workstation Floorbase Single Monitor 10-24 Height Adjustment, 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[Best Quality Spark Plug 12120037607 for BMW]

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Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[1.5 Inch High Pressure Petrol/Gasoline Water Pump]

Condell, R.A., Hanko,V.P., Larenas, E.A., Wallace,G.,and McCullough,K.A(1993), Analysis of native collagen monomers and oligomers by size-exclusion high-Load 1600kg Small Machine Room Bed Elevator. Analytical Biochemistry212,436-445[Farm & Industry Used Storage Grain Silo]

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Reis, M. and Beleza, V.(1989), Utilization of leather waste-Atf-805 Auto Transmission System Flushing Machine with CE/SGS: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Best Hot 120 Gas Pump Nozzle Fuel Injector Nozzle]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Classic High Strength Embossing Composite Wood Garden Gazebo]

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

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