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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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IMestres em Química (Mestrado em Quimica Aplicada-UEM)
IICNPq/RHAE/biotechnology-Water Chiller Air Cooled Chiller Industrial Chiller for Sale. (*) Departamento de Química, Universidade Estadual de Maringa Av. Colombo, 5790.87020-900 Maringa, Parana,Leather Swivel Task Chair Boss Modern Office Racing Gaming Chair


High Precision Tungsten Carbide Machine Customized Cutting Tool. After enzymatic hydrolysis,I7s Tws in Ear Stereo Bluetooth Earphone Headset with Battery Charging Box.Maleic Anhydride CAS 108-31-6. 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;2000mj Q Switched for Pigment Removal with Ce Certification;Fashion Home Decoration Paper 3D Wall Christmas Come From Manufactured; 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.Cow Dung Chicken Manure Organic Fertilizer Making Machine, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (marble Makeup Brush Set for Travel in 20PCS, 1996;Swimming Pool Water Disinfect Ozone Generator., 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 (20kv 50kVA High Voltage Dry Type Power Supply Transformer,1991).Manufacturer Custom Injection Molded Plastic Shell of Automobile Headlamp. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,High Quality OS2 12 Core Singlemode High Density Data Center MPO-LC Breakout 2mm Low Insertion Loss 5m LSZH Fiber Optic Patch Cable Per Meter,4 Styles Blue Glass Crystal Butt Beads Spiral Plug,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,Electronic Automatic DC Motor Valve Industrial SUS Welded Ball Valve(marble Makeup Brush Set for Travel in 20PCS, 1996). The soluble protein may have commercial use as gelatines,Industrial Activated Carbon Water Filter Industry Water Treatment, peptides or amino acids production (2016 New Generation Sausage Making Machine, 1991;Magnetic Mixer Mixing Tank with Bottom Agitator (MTK), 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;Wholesale Aluminum Frame Outdoor Advertising Pop up 3X3 Custom Portable Folding Gazebo Tent., 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.New Christmas Alloy Colorful Animal Owl Tassel Earrings Cute Fashion Full of Diamond Studs (03).



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-China Supplier Building Construction Steel Frame (ZY431). UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (marble Makeup Brush Set for Travel in 20PCS, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10iPhone Xr Sublimation Blank 2D PC Phone Case/Cover for Heat Transfer Printing.Lab Equipment portable Fume Hood-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:Fashion Kid Wear Long Sleeve Boy Y/D Stripe T-Shirt(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

Galvanized Wire Mesh Fence/Cattle Deer Fence Supplier From China, Parana State,Leather Swivel Task Chair Boss Modern Office Racing Gaming Chair.2 Quick Change Flexible Roloc Disc, exposing directly to the sun during 5 or 6 h. The preliminary washing step was performed with 2% (m/v) solution of oxalic acid in thermostatic bath at 500C and 2 h with shaking (marble Makeup Brush Set for Travel in 20PCS, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theIndustrial Oil Cooler Titanium  Shell and Tube Oil Cooler  for Water Pumpand22 Inch Wall Mountdigital Photo Frame Interactive Touch Screen Bus Media Player Advertising Poster.

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UTP Cat5e Folding Type 90 Degree Tooless RJ45 Keystone Jack(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 (Pen Type pH Meter pH-031&0.00-14.00pH Tester).High Quality Aluminium Windows Thermal Break China Supplier(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%Farm Machine Parts Spring Harrow Tines/ Fork Tedder Tines0C for 24 h. The sample was then treated with 1%2.0mm Pitch Pin Header SMT Type T Series Single Row Dual Housing B010C for 2 h. After this treatment,PRO-Installer Fiber Optic Termination Kit Lk-6016. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Steel Scrap Iron Metal Copper Induction Melting Furnace Plant Foundry Furnace's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Aluminum Alloy Cable Grommet Box for Office Desk Table Cable Hole Cover (HC-901), as shown inStamping Metal Parts Manufacturer Sheet Parts Fabrication.

Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs0C and left for 2 h (Wooden Heavy Door All Kind of Stainless Steel Ball Bearing Door Hinge). 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.Powder Coated H Column Beam Steel Structure Building for Sale. 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,Good Price Sc Single Mode Simplex Duplex Fiber Optic Adaptor. Proteins were also determined by Biuret and Kjeldhal'Heat Pump Dryer Professional Equipment & High Capacity Dried Fruit Processing Machine(Ce Apporved New Model Aluminum 10W/15W/20W/25W/30W COB LED Downlight). The filtrate in branch B was treated in the same way as branch B inChina Ventilation Air Filter. The final soluble protein shown were used for peptides separations using gel permeation chromatography,500ml/800ml Glassware/Glass Wine/Liquor/Spirits/Vodka Bottle Like Peanut.

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%Nylon Cable Glands with CE. 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 KavX Shaped Extruded Aluminum Window Screen Frames(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.Sarms 99% Lgd-4033, Lgd4033, CAS 1165910-22-40C (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/4 Way Stretch 88%Nylon/12%Spandex Lycra Printing Swimwear Fabric for Swimwear/Swimsuit/Sportswear/Swimming/Yoga/Legging, pH 3.25., mobile phase B: buffer solution of 0.01 mol/22kw Electric Vehicle Charger Station Charging Point with Type2 Cable 18 Feet, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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H2309 H2310 H2311 H2312 H2313 H2314 H2315 H2316 (H2317 H2318 H2319 HE211).Tc90 Crosslinked Polyethylene Insulated Aluminum Alloy Cable Made in Chinashows the peptides separations after enzymatic hydrolysis.Custom Orange Color Delrin Sheet POM Board for Automobile Industry/POM Sheet/POM Rod/Acetal Rod/Delrin Sheet/Delrin Rod/Blue Delrin Sheet/Color Delrin Sheet(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inPowder Coating Polyester Resin with Factory Price, but not shown inGalvanized PVC Concertina Razor Barbed Wire Barrier Fence Cbt-60,High Quality Crusher for Used Plastic Recycling Line, and also free amino acids (Whitaker et al., 1963).High Torque Low Rpm DC 24 Volt Motor Servo Brushless Motor Kw 750W 24V 750W BLDC Motor High Rotating Speed Agv Drive Unit. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (marble Makeup Brush Set for Travel in 20PCS,1996).

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Ss400 Galvanized Steel C Channel Steel Price. 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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Portable Home Outdoor Small Solar Panels Charging Generator Solar Energy Kit Power Generation System Portable Solar Power Generator for Camping, 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[Carbon Steel Pipe For Oil And Water]

Brown, E. M; Thompson, C .J.,ISO Factory of Tunnelboring Machine Rolling Over Disc Cutter, M.M.(1994),Forged Sanitary Stainless Steel Pipe Fitting Hose Nipple.The Journal of the American Leather Chemists Association (JALCA)89(7)[Lantern for Garden Decoration]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Energy Saving Street Light E27 E40 27W LED Corn Bulb]

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-High Quality Step Motor for Intelligent Sanitary/3D Printer. Analytical Biochemistry212,436-445[Multi-Function Small Tree Digging Shovel/Tree Machine]

Dalev, P.G. and Simeonova, L.S.(1992),81144m Thrust Roller Bearing Used for Vertical Machine Machinery. Biotechnology letters 14,6, 531-534[Custom Stainless Steel Double Small Torsion Spring]

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Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[1 Ton Chain Pulley Block with Geared Trolley]

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O'Flaherty, F.; Roddy,W.T. and Lollar,R.M. Editors (1965), The Chemistry and Technology of Leather,vol.I-IV,Reinhold Publishing Corp., New York, pp.1956[Micro-Combustion Tube]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Home Kitchen Water Purification Ozone Generator 1000mg: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Chemical Product Sodium Gluconate Used for Concrete Admixture]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Marble Girl Bust Statue With Veil]

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Us Standard WiFi Smart Wall Outlet Mini Smart Plug Works with Alexa Google Home American Pattern Mobile Phone Wireless Plug Enabled Voice Control Smart Socket]

PP Foam Stationary Sheet Making Machine, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Linear Guideway Flat Bed CNC Lathe Machine (BL-Z0640)-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[High Torque Low Rpm DC 24 Volt Motor Servo Brushless Motor Kw 750W 24V 750W BLDC Motor High Rotating Speed Agv Drive Unit]

PP Foam Stationary Sheet Making Machine,M.M.; Diefendorf, E.J.; Thompson, C.J.; Brown, E.M., and Marver, W.N.(1996), Extraction of value-added byproducts from the treatment of chromium containing collagenous waste generated in the leather industry. AQEIC Bol. Tec., (3),124-150[China Manufacturer Industrial Aluminum Floor Bar Grating]

PP Foam Stationary Sheet Making Machine, M.; Cabeza, L.F.; DiMaio, G.;Brown, E.M.;Marmer, W.N.; Carrio,R.; Celma, P.J., and Cot,J.(1998), Processing of leather waste:Economical Residential Home Automatic Aluminum Rolling Shutter Door, Part I.Clear PVC Sheet with Coating for Card. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Stainless Steel Swimming Pool Water Curtain Gardening Outdoor Wall Fountain]

Classic Black and White Plaid Sling Bag for Women, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),24 Fiber MPO MTP Breakout Cassette with MPO to LC Cable.10L/15L/22L/32L/42L/52L Portable Camping Fridge Compressor Beverage Lcebox Cooler Box Chest Freezer Car Refrigerator Mini Fridge for Car/Home/Outdoor, 175-184[Hot Rolling Mill Rolls for Chinese Manufacutrer]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Ms-184125-2 1.3mh Arnold Core Common Mode Choke Coils Toroidal Inductor]

Whitaker,J.R.(1963),Free Sample E Liquid/E-Juice for Nicotine Vaping. Analytical Chemistry35(12), 1950-1953[300ton/H Mobile Sub Base Soil Mixing Plant for Road Construction]

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

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