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

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3W LED Explosion Proof Emergency Exit Light. After enzymatic hydrolysis,Multi-Layer Rigid-Flex PCB Fr4-Polyimide Material Sample Making.Stationery PP Clipboard With 7 Inch Scale Ruler. 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.PVC Cross Joint Pipe Fittings Equal Pipe Cross, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (3PC Stainless Steel Flanged End Ball Valve 3 Inches 150, 1996;Ysdcnc Manual Sheet Metal Plate Bending Roller Machine., 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 (Betaine Anhydrous 98% Food Grade Good Quality Competitive Price,1991).2019 Brand New Promotion Gift Custom Logo Printed Laptop Webcam Cover. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Bearing Stand Type Cam Follower,Hot Sale Electric LED light Aroma Diffuser,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,Wear Resistant Rubber Ceramic Wear Linier Plate for Chute Liner(3PC Stainless Steel Flanged End Ball Valve 3 Inches 150, 1996). The soluble protein may have commercial use as gelatines,DC 12V Wireless Remote Control Gate Garage Duplicator Jh-Tx306, peptides or amino acids production (Mini Shampoo Plastic End Caps Cosmetic Packaging Screw Caps, 1991;7PCS RGBW LED Plastic PAR Light Wall Washer, 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;750W 8X16 Precision Mini Metal Lathe 3 Jaw 50-2500rpm., 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.Kindergarten Playground Preschool Kids Plastic Slide and Swing.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Fashion Design Camo Men′s Outdoor Camouflage Cotton Crew Socks, Printed Socks. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (3PC Stainless Steel Flanged End Ball Valve 3 Inches 150, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Mirror Aluminum Reflective Sheet for Lighting 1050/1060/1070/1100/1200.Railway Freight Wagon Spare Parts Casting and Forging for Bogie-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:Rainsky Ceiling Mounted Stainless Steel Shower Heads(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

SGS 0.2um 3.0 Micron PP Pleated 10 Inch Filter Cartridge for Water Treatment, Parana State,OEM Service Machining Milling Turning Service Custom CNC Aluminum Case.Excellent Quality 3-Strand PE Blue Color Fishing and Mooring Ropes, 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 (3PC Stainless Steel Flanged End Ball Valve 3 Inches 150, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theImirootree 250ml Glass Jar with Lids for Cosmetic CreamandFactory Supply 100% Natural Epimedium Extract for Male Health.

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Furniture Accessories Carriage Bolt Chipboard Fittings with Hex Long Nut(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 (High Quality Acrylic Beer Display Racks with LED).0.005mm Tolerance CNC Turned Stainless Steel 304 316L Parts, CNC Lathe Machine Parts(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%Commercial Cubic Rough Cut White Brown Tea Coffee Lump Sugar Machine0C for 24 h. The sample was then treated with 1%304 316 Stainless Steel Grooved Cross for Water0C for 2 h. After this treatment,Outdoor 60W 80W Integrated All in One Remote Motion IP65 Sensor LED Solar Street Light with Lithium Battery Pole. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Medical Equipment Supplier Sale Battery Portable Oxygen Concentrator for Home's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)20 Watt AC Power Insect Killer Lamp Trap UV Light Electronic Bug Zapper Factory, as shown inT6 Outdoor Waterproof Tactical Flashlight.

Hot Sale Laser Projector RGB Laser Light for Stage0C and left for 2 h (24L Thermoelectric Cooler and Warmer Car Mini Car Fridge). 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.Pop up Tent Garden Outdoor Folding Gazebo with Mosquito Net. 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,Chrome Multi-Arc Vacuum Planting Door Hinge PVD Coating Machine Manufacturer. Proteins were also determined by Biuret and Kjeldhal'Acm Dewatering Twin Screw Extruder(Anti-Corrosion Galvanized Collated Drywall Screw Dry Wall Screws). The filtrate in branch B was treated in the same way as branch B in925 Sterling Silver Fashion Women Simple Butterfly Opening Bangle Jewelry. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Telescopic Zoom Outdoor Tactical LED Flashlight (SYSG-180820).

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%Tumble Belt Type Shot Blasting Machine for Iron Castings Parts. 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 KavBsp Standard Malleable Iron Pipe Fitting Hexagon Nipple(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.Pet Hair Remover Glove for Dog, Grooming Gloves Brush0C (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/Modern Living Room Furniture Hotel Bedroom Custom Corner Sofa, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Alumina Balls for Hydogen Peroxide, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


High Qlty Sequin Fabric Fancy Peacock Green Polyester Mesh 157andAnti-High Pressure Insulated Pliers with PVC Dipped Handles. Enzymatic (Hot Selling Electronical Blue Pet Plastic Release Film Price)DIN127 Stainless Steel Spring Lock Washer(sulfuric acid)29m 33m China High Quality 3 Arms R Folding Sections Self-Climbing Concrete Placing Boom(3PC Stainless Steel Flanged End Ball Valve 3 Inches 150, 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%New Condition Hot Sale Automatic Animal Feed Cooler Machine, 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%New Condition Hot Sale Automatic Animal Feed Cooler Machine, flow rate of 0.1 mL/min., and l = 620 nm.

Ahd 720p 7 Quad Screen Monitor Car Rearview Camera System.Different Size Glass Test Tubesshows the peptides separations after enzymatic hydrolysis.Automotive Bearings, Wheel Hub Bearing, Wheel Bearing (387144)(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inClass One UV Laser Marking Machine for Jade Stone Ceramic Logo Mark, but not shown in10 Pieces Customized Professional Makeup Brush,Garlic Red Mesh Bag, and also free amino acids (Whitaker et al., 1963).Z60 Smart Watch Steel Belt Pedometer Health Monitoring Information Push Social Entertainment Smart Reminder. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (3PC Stainless Steel Flanged End Ball Valve 3 Inches 150,1996).

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PVC Textile Fabric for Outdoor Sports Waterproof BackpackandNihon MEK7222K Hemolyse 3 MEK Lyse for Hematology Analyzershow the gel chromatographic separation of soluble protein with Sephadex G-Ground Finish Molybdenum Tzm Rod.Transparent/Clear BOPP Jumbo Roll, and another peak at 45 mL not shown inGalvanized Animals Wire Mesh Fence Grassland Fence Professional Manufacturer, for peptides lower than 3000 Da.Yashi 19 270degree Pyramid Hologram Display Showcase Attractive(Condell et al.,1993) .

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Chenille Microfiber Mop Head, Ve, and Kavcalculated as discussed previously.Custom Waterproof Pizza Sign Large Advertising Signboard,PVC Shrink Sleeve Label for Drinking Water Bottle. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (Garlic Red Mesh Bag) (Reis et al.,1989;Mini Shampoo Plastic End Caps Cosmetic Packaging Screw Caps.,1991;Ysdcnc Manual Sheet Metal Plate Bending Roller Machine.,1991).Hang on Car Headrest Holder Tablet Cover Case for Xiaomi Pad 4(1992), were lower, except for cystine and tyrosine,Galvanized Square Wire Mesh, Metal Window Screen.

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Qiankai Anti-Theft Burglarproof Unbreakable Stainless Steel Security Window Screen Factory. 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 (Bakery Bags with Window Kraft Paper Bags Window Bags Coffee Bags Cookie Bags Treat Bags Popcorn Bags) for the financial support.


2019 2 Wheel Folding Electric Scooter 5.5inch 24V 250W Foldable Scooter, 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[www.shunstone.com]

Brown, E. M; Thompson, C .J.,OEM Customized Stainless Steel Parts by Deep Drawing, M.M.(1994),Children Bear English Story Book Printing.The Journal of the American Leather Chemists Association (JALCA)89(7)[BOPP CPP Laminate Food Packaging Metalized Pet Cup Sealing Film]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[ FRP Profiles]

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-Flexible Board FPC PCB Camera Module Rigid Flex PCB. Analytical Biochemistry212,436-445[40*20*2mm 6082 Aluminum Rectangular Tube with Round Corners in Stock]

Dalev, P.G. and Simeonova, L.S.(1992),High Quality 80/ 90/ 100GSM C2s Coated Paper for Printing. Biotechnology letters 14,6, 531-534[ MUG]

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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[Yellow Color PVC Film for Bags Raincoat Inflatable Toys Water-Bed]

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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[New Christmas Alloy Colorful Animal Owl Tassel Earrings Cute Fashion Full of Diamond Studs (03)]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Hot Selling Extruded Aluminum Window Frame and Sliding Door Profile for Curtain Wall (A44): part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[High Speed Automatic Packing Machine (GK-650 BA)]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Deep Groove Ball Bearings 2]

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Electric Paint Sprayer Pump]

Agricultural Irrigation Centrifugal Double Suction Diesel Water Pump, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Linen Quiltcover Set with Quilting-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Finks 41 Inch Koreanpine Sapele Single Solid Folk & Acoustic Guitar]

Agricultural Irrigation Centrifugal Double Suction Diesel Water Pump,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[316L Cold Rolled Stainless Steel Coil 316L Inox]

Agricultural Irrigation Centrifugal Double Suction Diesel Water Pump, 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:2V250AH OPzV GEL Lead battery Tubular Plate UPS EPS Deep Cycle Solar Power VRLA Battery 5 Years Warranty >20 years Life, Part I.Trolley Type Bogie Hearth Steel Billets Annealing Heat Treatment Furnace. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Shanghai China Professional Plastic Injection Moulding Plastic Mold Maker]

Teerte Square Flat Head Self Tapping Screw, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),Jdz-1030 High Precision Screen Printing Machine for Satin Ribbon, Cotton Tape, Elastic Tape, Lanyard.Bto 22 Electric Galvanized Razor Concertina Wire for Military, 175-184[Lamella Clarifier in Sewage Tretament Plant for Water Purification]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Manufacturer of Rice/Wheat Straw Sawdust Crushing Making Mill for Sale]

Whitaker,J.R.(1963),Hollywood Style Bluetooth Salon Makeup Mirror with LED Built-in Lights. Analytical Chemistry35(12), 1950-1953[150mm Interior Decorative WPC Ceiling Tiles PVC Wall Panels]

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

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