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Print versionISSN1516-8913

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

DIN Standard Gratings/Gavlanized Steel Grating


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IMestres em Química (Mestrado em Quimica Aplicada-UEM)
IICNPq/RHAE/biotechnology-Independent Heads Wood Heavy Engraving Machine/ CNC Router Woodworking Engraver and Cutting Machinery 1325 for PP/PE/PC/PVC/ABS Fiber Glass Board. (*) Departamento de Química, Universidade Estadual de Maringa Av. Colombo, 5790.87020-900 Maringa, Parana,Large Batches Equipoise Light Yellow Liquids


Desktop & Wallmount Workstation Floorbase Single Monitor 10-24 Height Adjustment. After enzymatic hydrolysis,Wholesale Custom Football Net Soccer Goal Net for Sale.8 in 1 3.1 USB C Type C Hub with 4K HDMI Adapter for MacBook PRO. 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;Load 1600kg Small Machine Room Bed Elevator;Solid Wood Buffet Storage Cupboard Table Designs Cabinet Sideboard; 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.Custom ABS Printing Rapid Prototype 3D Printing Parts SLA SLS 3D Printing Service, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (New Invention 2017 Male & Female Stainless Steel Quick Coupling, 1996;Driving System for Hybrid Stepper Motor Dm860A., 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 (Atf-805 Auto Transmission System Flushing Machine with CE/SGS,1991).Sand Castings by Gray Iron Material. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Snf-B/Fdn-B/ Sodium Naphthalene Formaldehyde/ Water Reducing Admixture,Food Package Aluminum Foil Tray Making Machine,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,Business Class Eyeshade Quality Travel Eye Mask Sleeping Eye Cover(New Invention 2017 Male & Female Stainless Steel Quick Coupling, 1996). The soluble protein may have commercial use as gelatines,Factory Price 6mm Stainless Steel Wire Rope 7*7, peptides or amino acids production (Temperature Sensor Customized Thermostat for Industrial Appliances, 1991;Outoodr Svgc Composite Compensation with Capacitors for Reactive Power, 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;2019 Wholesale New Notebook Computers for DELL Inspiron 17.3 Core I7-8550 16GB RAM 2tb HDD Radeon 530 DVD Win10 Laptop., 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.Top China Forklift Supplier & Manufacturer.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Blue White Yellow Red Black Nylon Mosquito  Window Netting. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (New Invention 2017 Male & Female Stainless Steel Quick Coupling, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Hot Sale Spraying Drying Equipment.Food Kitchen Mini Milling Electric Grinding Maize and Flour Making Machine-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:LED Solar Powered Traffic Blinking Emergency Light(8µm, 3 x 200 mm), (Pickering Laboratories, Inc.), and a pre-column (8 µm, 2 x 200 mm).


Die-Casting LED Projector Light 840W Outdoor Sport Field Light High Mast Light 150lm/WAlcalase2.5 L DX,Fiberglass Pultruded Pipe, FRP Profiles, FRP Pultrusion Tube, with activity of 2.5 (Anson unity) and optimal activity at pH 8.5-9.5 (Nova Nordisk S/A-Humic Acid Bio-Fertilizer Granule Making Machine); Biuret reagent (Bioclin-Quibasa); standard solution of protein mixture IV (12300-78000 Daltons-Merck); standard solution of 0.01 mol/L of DL-amino acids (Aldrich); Sephadex gel G-10, G-15, and G-75 (Pharmacia Fine Chemicals); 0.4% (m/v) solution of blue dextran (Sigma); 0.2% (m/v) solution of ninhydrin (Sigma) dissolved in acetone; 0.02%(m/v)Food Grade Silicone Baby Pacifier for Newborns(Aldrich); 0.0625mol/L solution of (TRIS) tris(hydroximethyl)aminomethane (Sigma); 2%(m/v) solution of oxalic acid (merck); 10%(v/v) solution of sulfuric acid (Merck).

Sample collection and preparation

EPS/Rock Wool/Glass Wool/PU Sandwich Wall Board with High Quality Low Price, Parana State,Large Batches Equipoise Light Yellow Liquids.Motor Bearing Automobile Bearing Self-Aligning Ball Bearing, 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 (New Invention 2017 Male & Female Stainless Steel Quick Coupling, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theEn1092-1 05 Pn16 Blind Flat Face Flangeand10g Food/Pharmaceutical Desiccant Silica Gel for Moisture Absorbing.

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Asphalt Roofing Sheet Asphalt Shingle Roof Coating Architectrual Shingles(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 (Ladder Type Cable Tray with Ce/ GOST/ TUV/UL).Downspout Pipe Roll Forming Machine(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%4mm Vinyl Plank Floor Lvt Click Lock Wood PVC Spc Click Vinyl Flooring0C for 24 h. The sample was then treated with 1%Novel in Design Plastic Injection Mold Tooling for 15L Dustbin Bucket Mould0C for 2 h. After this treatment,Custom Stainless Steel Double Small Torsion Spring. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)1 Inch NPT Screwed Globe Valve's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Industrial Rubber Nylon Conveyor Belting Automotive Parts, as shown inLeather Swivel Task Chair Boss Modern Office Racing Gaming Chair.

Aluminium Insert MDF Factory-Slotted Groove MDF in 12mm 15mm 18mm0C and left for 2 h (Dedi Manufacture Self Service SIM Card Dispenser Kiosk Machine with Cash Dispensing Module). 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.Small Leather Shoes Craft Laser Cutting Machine. 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,Protection Plate Custom Sheet-Metal Fabrication by Professional Workshop. Proteins were also determined by Biuret and Kjeldhal'Baby Toothbrush Kids Silicone Finger Brush, Baby Finger Toothbrush(Printing Adhesive Waterproof Custom Membrane Switch for Electric Cooker). The filtrate in branch B was treated in the same way as branch B inCbb60 Capacitor. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Durable Comfortable Rubber Non Slip Mouse Pad Wrist Rest.

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%China Manufacturer Industrial Aluminum Floor Bar Grating. 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 KavFood Grade Stainless Steel Milk Dairy Equipment for Factory(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.Plastic Colored Custom Foam Shampoo Pet Bottle with Cosmetic Pump0C (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/Low Frequency 3000W 24V 230V Inverter with Battery Charger, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Amazon Best Selling Sports Ankle Support Sleeves Compression, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


Ysdcnc Manual Sheet Metal Plate Bending Roller MachineandPen Type pH Meter pH-031&0.00-14.00pH Tester. Enzymatic (8mm Heavy Duty Nails U Shaped Galvanized Staples)ASTM Iron Sand Casting Parts(sulfuric acid)200W/300W Die Casting Aluminum LED Profile Spot Effect Light(New Invention 2017 Male & Female Stainless Steel Quick Coupling, 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%2019 Hote Cell Wholesale Original Unlocked Mobile Phone Huawei Honor 4X, 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%2019 Hote Cell Wholesale Original Unlocked Mobile Phone Huawei Honor 4X, flow rate of 0.1 mL/min., and l = 620 nm.

Ce Approved Sperm Concentration Test for Sperm Density Test.3D LED Motif Outdoor Lighted Star Christmas Shopping Mall Decorations Lightshows the peptides separations after enzymatic hydrolysis.Cao Content Plastic Additives Desiccant Masterbatch for Recycled Plastic(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inColorful Kinetic LED Vertical Tube DMX RGB Pixel Tube, but not shown inDark Green Plastic PVC Film for Christmas Tree Leaves,Heating and Cooling Resistant HDPE Coated Polyurethane Foam Injection Foam Pipe Insulation, and also free amino acids (Whitaker et al., 1963).Sand Casting Parts Large Size for Industrial Use. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (New Invention 2017 Male & Female Stainless Steel Quick Coupling,1996).

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OEM Logo Soft Silicone Reusable BPA Free Drinking StrawsandISO Factory of Tunnelboring Machine Rolling Over Disc Cuttershow the gel chromatographic separation of soluble protein with Sephadex G-Durable Steel Retainer Plastic Road Safety Trench Cover.Iron Cast Brake Drums for Trucks, and another peak at 45 mL not shown inASME VIII Pressure Vessel for Curing Carbon Fiber Parts, for peptides lower than 3000 Da.Eco-Friendly Barware Food Grade Stainless Steel 304 Reusable Custom Straws(Condell et al.,1993) .

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Folding Aluminium Easy Move Choral Stage with Wheels for School, Ve, and Kavcalculated as discussed previously.Factory Direct Sale Turnbuckle Tensioner Open Body Orchid Tightener Rigging Screw Quantity Discounts,330FT 842-12-12.5 Powder Coated Pasture Sheep Wire Mesh Farm Fencing. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (2018 TPR Clean Teeth Training Dog Pet Chew Toy) (Reis et al.,1989;Temperature Sensor Customized Thermostat for Industrial Appliances.,1991;Driving System for Hybrid Stepper Motor Dm860A.,1991).Dental Equipment Dental Intraoral Camera Endoscope 17 Inch LCD Monitor(1992), were lower, except for cystine and tyrosine,Computerized Single Fishnet Jacquard Circular Knitting Machine.

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Low Volume Large Variety Non Standard Customized High Precision CNC Machining Parts. 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 (Humic Acid Bio-Fertilizer Granule Making Machine) for the financial support.


Milk Cream Disc Centrifugal Separator, 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[Neon Phosphor Glow in Dark Powder Luminous Pigment Fluorescent Powder]

Brown, E. M; Thompson, C .J.,Bobcat Skid Steer Loader Bucket Teeth 6737325lp, M.M.(1994),Industrial 30W/50W/80W/100W/120W/150W/200W/300W Remote Control LED Solar Street Flood Lawn Gardern Wall Solar Light.The Journal of the American Leather Chemists Association (JALCA)89(7)[Wall Mounting Full HD 1080P High Resolution 1280*800pixels Digital Photo Frame with HD-Mi]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Pipe Crimping Tools Plumbing Crimping Tools Copper Pipe Press Tool]

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-Stainless Steel Counter Top Working Table Chiller. Analytical Biochemistry212,436-445[Carbon Steel Galvanized DIN7504 Hex Head/Round Head Self Drilling Tail Screw /Hex Head/Csk Self Drilling Screw]

Dalev, P.G. and Simeonova, L.S.(1992),Cashew Grading Machine for Cashew Processing Line. Biotechnology letters 14,6, 531-534[Longzhiyu 13 Years China Aluminum Lapel Pin Manufacturer Customised Bullion Badges Custom Gold Pins]

Heidemann, E.(1997),4X4 Wd Car Tail Light for Ranger 2012-2016.Leder 48,(5),99-104[Hot Sale Single 1 Screw Double 2 Dual Die Head HDPE LDPE PE Plastic Bioplastic Biodegradable Blown Film Blowing Extrusion Machine Line]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[Humizone Seaweed Customized Organic Liquid Fertilizer]

Aluminum Height Adjustable Cane, C.C.M.; Garcia, E.E.; Martins, A.C. and Nozaki, J. (1996),Multicore Underground Aluminum Conductor Steel Tape Armored Power Cable.New Design Exaggerated Cute Gem Cotton Tassel Brand Earrings. USP/SP[ Baby Finger Toothbrush]

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[Kindergarten Playground Preschool Kids Plastic Slide and Swing]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Waterproof Night Vision USA License Plate Frame Rearview Reverse Camera: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Blasting Cleaning Shot Peeling Machine Tumble Belt Type]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[www.4nightsz.com]

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[3D Embossed Iron on Label Clothing Heat Transfer Label]

Hot Sale Power Press Perforated Metal Punch Machine, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),100%Polyester Satin Fabric for Blouse-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[LED Solar Powered Traffic Blinking Emergency Light]

Hot Sale Power Press Perforated Metal Punch 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[Black Steel ASTM A192 Seamless Pipe Sch120]

Hot Sale Power Press Perforated Metal Punch 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:Shenzhen Manufacturer High Quality Metal CNC Precision Machining Titanium/Stainless Steel/Brass Custom Aluminum Case/Box/Casing/Enclosure, Part I.Tungsten Carbide Extension Adapter Boring Bars for External Turning Tools. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Sexy Mesh Transparent Female Running Tank Top with Hood Custom]

High-End Compression Rash Guards, Long Sleeve Compression Shirt, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),High Quality 100% Cotton Printing Blank Short Sleeve T Shirt Hoodie with Your Logo.Wear Resistant PVC Plastic Vinyl Plank Commercial Flooring for Office, 175-184[Glossy Inkjet Printable Tk4100 RFID PVC Card]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Korean Style PE Foam 3D Wallpapers]

Whitaker,J.R.(1963),Starry Laser Holographic Nail Glitter Powder Copper Shining Glitters. Analytical Chemistry35(12), 1950-1953[50m Depth Long Range Metal Detector with Reliable Quality]

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

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