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

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High Quality Aluminium Windows Thermal Break China Supplier. After enzymatic hydrolysis,Farm Machine Parts Spring Harrow Tines/ Fork Tedder Tines.2.0mm Pitch Pin Header SMT Type T Series Single Row Dual Housing B01. 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;PRO-Installer Fiber Optic Termination Kit Lk-6016;Steel Scrap Iron Metal Copper Induction Melting Furnace Plant Foundry Furnace; 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.Aluminum Alloy Cable Grommet Box for Office Desk Table Cable Hole Cover (HC-901), about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs, 1996;Powder Coated H Column Beam Steel Structure Building for Sale., 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 Sc Single Mode Simplex Duplex Fiber Optic Adaptor,1991).Heat Pump Dryer Professional Equipment & High Capacity Dried Fruit Processing Machine. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,500ml/800ml Glassware/Glass Wine/Liquor/Spirits/Vodka Bottle Like Peanut,Nylon Cable Glands with CE,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,X Shaped Extruded Aluminum Window Screen Frames(Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs, 1996). The soluble protein may have commercial use as gelatines,Cuticle Aligned Raw Virgin Hair Easy to Dye Real Mink Brazilian Hair, peptides or amino acids production (Sarms 99% Lgd-4033, Lgd4033, CAS 1165910-22-4, 1991;4 Way Stretch 88%Nylon/12%Spandex Lycra Printing Swimwear Fabric for Swimwear/Swimsuit/Sportswear/Swimming/Yoga/Legging, 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;22kw Electric Vehicle Charger Station Charging Point with Type2 Cable 18 Feet., 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.Yashi 98 Inch Display Multi Touch Interactive Whiteboard   LCD.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Low Power Consumption Laser Foam Vertical Die Cutting Machine. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10New Bone China Mug, 16oz Coffee Cup, New Shape Ceramic Mug, High Quality White Mug.Agriculture Plastic Film Polycarbonate Metal Prefab Greenhouse-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:Q235 Jr Hollow Structual Section Steel Tubes with Good Quanlity(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

SS304 316 DIN Standard Ce Stainless Steel Spool Wire for Binding or Weaving, Parana State,UTP Cat5e Folding Type 90 Degree Tooless RJ45 Keystone Jack.Wear Resitant Rope End Cap Plastic Flange Cover, 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 (Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theOak Laminate Grey Floating Cork Vinyl Plank Flooringand0-10V Analog 1000mm Linear Position String Encoders Rotary Encoder String Potentiometer.

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Comfortable Two Piece Women Fitness Clothing for Gym Wear(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 (Headband Big Headphone EVA Bag Tool Case Specialized Storage Box).Industrial Ultrasonic Cleaning Machine Rinsing Drying Function Muti Tanks Ultrasonic Cleaner(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%Flat Surface Mounted 300mm 24W LED Panel Light for Interior0C for 24 h. The sample was then treated with 1%Latex Paint Emulsion Thickener Agents with High Leveling Property0C for 2 h. After this treatment,Fresh Juice with Suagr Filling Bottling Machine Small Scale Low Prices. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Orfs Male/Orfs Female Hose Fitting's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Ss400 Galvanized Steel C Channel Steel Price, as shown inAhd 720p 7 Quad Screen Monitor Car Rearview Camera System.

Portable Home Outdoor Small Solar Panels Charging Generator Solar Energy Kit Power Generation System Portable Solar Power Generator for Camping0C and left for 2 h (Home Use Standing Modern Floor Lamp (KAF6108)). 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.ISO Factory of Tunnelboring Machine Rolling Over Disc Cutter. 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,Forged Sanitary Stainless Steel Pipe Fitting Hose Nipple. Proteins were also determined by Biuret and Kjeldhal'High Quality Step Motor for Intelligent Sanitary/3D Printer(Hot Sale Custom Made Sublimation Printing Women Polyester Gym Shorts). The filtrate in branch B was treated in the same way as branch B inLaser Cutter Machin Engrav. The final soluble protein shown were used for peptides separations using gel permeation chromatography,81144m Thrust Roller Bearing Used for Vertical Machine Machinery.

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%Fancy Veneer Plywood. Natural Veneer Plywood for Furniture. 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 KavOEM Custom Sand Casting Supply Square and Round Ductile Cast Iron Manhole Cover and Drain Grating(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.Home Kitchen Water Purification Ozone Generator 1000mg0C (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/PP Foam Stationary Sheet Making Machine, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Linear Guideway Flat Bed CNC Lathe Machine (BL-Z0640), pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


230VandEconomical Residential Home Automatic Aluminum Rolling Shutter Door. Enzymatic (Clear PVC Sheet with Coating for Card)Classic Black and White Plaid Sling Bag for Women(sulfuric acid)24 Fiber MPO MTP Breakout Cassette with MPO to LC Cable(Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs, 1996). Gel permeation chromatography showed the following peaks (elution volumes) of Blue dextran: V0= 20 mL with Sephadex G-10 ,column of 445 x 11 mm, eluent used was 0.02%10L/15L/22L/32L/42L/52L Portable Camping Fridge Compressor Beverage Lcebox Cooler Box Chest Freezer Car Refrigerator Mini Fridge for Car/Home/Outdoor, flow rate of 0.8 mL/min, l = 620 nm . V0was also 20 mL for Sephadex G-15 under the same conditions. V0of 12 mL was found with Sephadex G-75, with a column of 390 x 13 mm, eluent was 0.02%10L/15L/22L/32L/42L/52L Portable Camping Fridge Compressor Beverage Lcebox Cooler Box Chest Freezer Car Refrigerator Mini Fridge for Car/Home/Outdoor, flow rate of 0.1 mL/min., and l = 620 nm.

Free Sample E Liquid/E-Juice for Nicotine Vaping.160 Short Pitch Precision Roller Chain High Tensile Strength Roller Chainshows the peptides separations after enzymatic hydrolysis.Colored Foil Paper Hot Stamping Heat Transfer Print Package Craft(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inChina Modular Luxury Movable Shipping Container Beautiful Villa House with Bathroom Tiny Modular Homes, but not shown in10ton Telescopic Hydraulic Truck Crane,100% Acrylic Knitted Sports Woven Scarf, and also free amino acids (Whitaker et al., 1963).Prefab Steel Structure Shed for Storage Warehouse. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (Best Polishing Pads Concrete Grinding Discs Diamond Sanding Discs,1996).

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3pH in 3 pH out High Frequency Online UPS - Modular UPS 10 -300kVA, Ve, and Kavcalculated as discussed previously.1650mm*80mm Stable Power Laser Tube,FDA ISO Ce Marked Medical Diagnostic Dengue Rapid Test Kit. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (Fresh Juice with Suagr Filling Bottling Machine Small Scale Low Prices) (Reis et al.,1989;Sarms 99% Lgd-4033, Lgd4033, CAS 1165910-22-4.,1991;Powder Coated H Column Beam Steel Structure Building for Sale.,1991).High Quality Lead Ingot 99.994 Reasonable Price(1992), were lower, except for cystine and tyrosine,Micro-Combustion Tube, Test Tube (HK-224).

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Stn Type 132X64 Round Display Small 2.1 Inch Cog DOT Matrix St7565r LCD Display Module Screen. 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 (High Quality Crusher for Used Plastic Recycling Line) for the financial support.


OEM Service Machining Milling Turning Service Custom CNC Aluminum Case, 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[Hydraulic Chair Pump]

Brown, E. M; Thompson, C .J.,3W LED Explosion Proof Emergency Exit Light, M.M.(1994),Multi-Layer Rigid-Flex PCB Fr4-Polyimide Material Sample Making.The Journal of the American Leather Chemists Association (JALCA)89(7)[Network Camera Dedicated 4-Channel 100m Network Optical Transceiver Four-Port Optical Transceiver 1 Optical 4 Electrical Switch]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Magic Tape Hook and Loop Fasteners]

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-Stationery PP Clipboard With 7 Inch Scale Ruler. Analytical Biochemistry212,436-445[Construction Chemicals Raw Material Sodium Lignosulphonate for Cement Plasticizer]

Dalev, P.G. and Simeonova, L.S.(1992),Automatic Food Cookies Cake Cartoning Machine for Big Size Carton Box. Biotechnology letters 14,6, 531-534[11oz Manufactures of Ceramic Mug Customised Sublimation Cup for Sublimation Wholesale]

Heidemann, E.(1997),Custom Blue Round Lid Spray Perfume Glassware Cosmetic Glass Bottle.Leder 48,(5),99-104[Non-Ionic Antistatic Agent]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[Iron Welded Gabion Basket Retaining Wall]

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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[2019 Ebay Hot Prefilled Salt Nicotine Tomato Sauce Disposable Vape Device]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Ysdcnc Manual Sheet Metal Plate Bending Roller Machine: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[2019 2 Wheel Folding Electric Scooter 5.5inch 24V 250W Foldable Scooter]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Lamp Ceiling]

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Low Power Consumption Laser Foam Vertical Die Cutting Machine]

Betaine Anhydrous 98% Food Grade Good Quality Competitive Price, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),2019 Brand New Promotion Gift Custom Logo Printed Laptop Webcam Cover-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Six Stations Pen Press Machine]

Betaine Anhydrous 98% Food Grade Good Quality Competitive Price,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[Water Oxygen Jet Peel Facial Beauty Salon Machine for Skin Care Deep Cleaning]

Betaine Anhydrous 98% Food Grade Good Quality Competitive Price, 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:Bearing Stand Type Cam Follower, Part I.Hot Sale Electric LED light Aroma Diffuser. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Wholesale Wooden Lid Borosilicate Jam Honey Storage Glass Jars]

Wear Resistant Rubber Ceramic Wear Linier Plate for Chute Liner, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),DC 12V Wireless Remote Control Gate Garage Duplicator Jh-Tx306.Mini Shampoo Plastic End Caps Cosmetic Packaging Screw Caps, 175-184[12V 100ah Deep Cycle Storage Gel Battery (QW-BG100A)]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[China Manufacturer Lm800 Forklift Trucked Mounted Drum Lifter]

Whitaker,J.R.(1963),7PCS RGBW LED Plastic PAR Light Wall Washer. Analytical Chemistry35(12), 1950-1953[Korea Technology Commercial Waterproof Eco Click Lock Luxury Vinyl PVC Plank Flooring]

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

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