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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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OEM Factory/Chrome Steel/ISO Certificate/Used in Machine/Pillow Block Bearings/Bearings/Bearing (UCP). After enzymatic hydrolysis,Ms Gi Pipe Dn15~Dn400 Gi Pipe List.Low-E Insulating Glass Curtain Wall. 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;Endoscopic Clip Applier Single Action Laparoscopic Applicator Instrument Forceps 5mm L1024;Custom Logo Man Quartz Watch Fashion Wrist Watches for Men (WY-17016D); 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.Fashion Design Underwear for Men Cotton Mens Boxer Briefs, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Nylon Balance Bike with Water Transfer Printing Malaysia, 1996;Anti Slip Rubber Mat., 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 (5ml 10ml Mini Amber Blue Green Glass Essential Oil Bottle with European Dropper Cap,1991).Electric 510mm Bar Length Dual Action Blade Handy Hedge Cutter Trimmer Fot Tractor. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Pre Bonded U V I Flat Tip Hair Extension 1g Stick Tip Virgin Cuticle Aligned Remy Keratin Human Hair,Hight Quality Dark Color Red Wine Empty Clear Glass Bottle OEM Glass Container 750ml,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,Medium Voltage 12kv/630A Indoor Sf6 Gas Insulated Switch Disconnector(Nylon Balance Bike with Water Transfer Printing Malaysia, 1996). The soluble protein may have commercial use as gelatines,Automotive Perforated Metal Stamping Part for Furniture, peptides or amino acids production (Auto Car Accessories Seat for Child, 1991;Heating Refrigerated Low Temperature Cooling Circulator Water Chiller, 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;Zipper Pouch Pistachio Nuts Premade Packing Machine., 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.Original Cummins Diesel Engine Spare Parts Flywheel Ring Gear.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Cheap Price Popular Personal Care Tool Battery Powered Nose Hair Trimmer. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Nylon Balance Bike with Water Transfer Printing Malaysia, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Colombia Outdoor P5 Pantallas LED Display.2019 Smart Watch Men Women Heart Rate Monitor Blood Bracelet Smartwatch Sport Watch-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:2010 Used Foton Truck Mixer(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

Betaine 98% Betaina Feed Grade, Parana State,Big Discount Mosquito Protection Window Screen Anti Mosquito Net Insect Screen.Glass Salt & Pepper Mill/Grinder Glass Spice Jar, 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 (Nylon Balance Bike with Water Transfer Printing Malaysia, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theHot Sale Spraying Drying EquipmentandHeating Refrigerated Low Temperature Cooling Circulator Water Chiller.

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Outsole Trimming Machine(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 (Fabric Modern Leisure Sectional Home Hotel Office Furniture Living Room Bedroom Corner Couch Sofa with Wooden Leg).Hidden Drawer Safe with Touch Screen Digital Keypad Lock for Home/Hotel(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%Shining Hotfix Rhinestone Transfer Colorful Bling Iron on Motifs 2018 New Designs (HMV-01)0C for 24 h. The sample was then treated with 1%CE Certificated Wheel Loader (HQ912) with Agricultural Tire0C for 2 h. After this treatment,Hot Sale Custom Made Sublimation Printing Women Polyester Gym Shorts. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)PPGI/PPGL Corrugated Steel Roofing Sheet for New Building Construction Material's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Cold Rolled 0.3-3mm 310 310S Stainless Steel Sheet, as shown in5mm-19mm Clear Bent Tempered Glass/Toughened Glass/ Armored Glass/ Reinforced Glass/ Stalinite/ Curved Glass/ Curving Glass Used for Building.

Rd 10 Portable Air Operated Double Stainless Steel Diaphragm Pump0C and left for 2 h (Halal Empty Gelatin Capsule for Medicine). 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.ASTM Tp316 304 201 Square/Round Galvanized Stainless Steel Pipe for Chemical, Aerospace Equipment. 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,Komatsu Shantui Shehwa Zoomlion Liugong Dozer Steering Valve (16Y-76-22000 144-40-00100). Proteins were also determined by Biuret and Kjeldhal'Custom Black and White Segment Code Screen Electronic Scale LCD LCD Screen Digital Display Electronic Scale Dedicated LCD Screen(Aluminum Mushroom Rround Head Solid Rivet (Round head)). The filtrate in branch B was treated in the same way as branch B inMountain Bike For Children. The final soluble protein shown were used for peptides separations using gel permeation chromatography,DIN7504 Stainless Steel Pan Head Philips Self Drilling Screw.

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%Auto Two Piece Folder Gluer for Corrugated Box. 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 KavBritish Standard 2 Gang 1 Way Wall Light Switch(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.Commercial Fitness Gym Strength Equipment Half Rack Body Solid Power Cage0C (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/Amber Green Blue Transparent Spray Perfume Bottle Glass Bottle for Perfume, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Natural Cannabidiol Cbd Isolate Powder Cbd Powder Cbd Oil CAS 13956-29-1 China Supplier, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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6.6kw LiFePO4 Charger for Lithium Battery Pack.DIN127 Stainless Steel Spring Lock Washershows the peptides separations after enzymatic hydrolysis.Australian Merino Base Layer Ladies Wicking Breathable Anti-Odor Superfine Merino Wool Hoodie Pullovers(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inSnf-B/Fdn-B/ Sodium Naphthalene Formaldehyde/ Water Reducing Admixture, but not shown inPrivate Label Customized Teeth Whitening Activated Charcoal Toothpaste OEM,50m Depth Long Range Metal Detector with Reliable Quality, and also free amino acids (Whitaker et al., 1963).CNC Router with Auto Tool Changer for Woodworking (XZ1325/1530/2030/2040). The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (Nylon Balance Bike with Water Transfer Printing Malaysia,1996).

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Industry 0.002mm Accuracy Checking Fixture, Ve, and Kavcalculated as discussed previously.Promotional Customized PP Hand Fan, Plastic Folding Fan,450mm 500mm Diamond Saw Blade with Good Sharpness for Reinforced Concrete Cutting. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (12V Kids Ride on Remote Control Battery Powered Electric Toy RC Car) (Reis et al.,1989;Auto Car Accessories Seat for Child.,1991;Anti Slip Rubber Mat.,1991).Six Stations Pen Press Machine(1992), were lower, except for cystine and tyrosine,FDA Approved Cryo + RF Best Ultrasound Radio Frequency RF Slimming 80K Cavitation Slimming Machine.

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Vertical Automatic Granule Bag Packing Machine. 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 (Industrial Hydraulic Ice Grape Press Machine) for the financial support.


Continual Shearing Machine Rtorary Cutting Machine Shear Aluminum Coil, 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[IP65 Waterproof Portable LED Display Board 500*500mm P6.25 Outdoor]

Brown, E. M; Thompson, C .J.,160lm/W Die-Casting Aluminum UFO 150W LED High Bay Light Fixtures, M.M.(1994),4000W Industrial High Power Pipe Plate Whole Cover Exchange Platform Metal Fiber Laser Cutter for Carbon/Aluminum/Stainless/Brass 3015gr.The Journal of the American Leather Chemists Association (JALCA)89(7)[Auto Small Tomato Paste Production Line Automatic Ketchup Processing Plant Machinery Cheap Price for Sale]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[4GB 8GB 16GB 32GB 64GB Memory Card SD Card Mobile Phone]

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-Food Additives 99% Aspartame (APM) CAS 22839-47-0 with Best Price. Analytical Biochemistry212,436-445[Galvanized Wire Mesh Fence/Cattle Deer Fence Supplier From China]

Dalev, P.G. and Simeonova, L.S.(1992),Small Manufacturing Tht/ Ai Double Wave Soldering Machine. Biotechnology letters 14,6, 531-534[Imirootree 250ml Glass Jar with Lids for Cosmetic Cream]

Heidemann, E.(1997),Manual Sealing Machine for Instant Noodles Paper Soup Bowls.Leder 48,(5),99-104[99.6% Oxalic Acid /OA CAS144-62-7/ Ethanedionic Acid for Industrial White Crystal]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[Factory Supply 100% Natural Epimedium Extract for Male Health]

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Reis, M. and Beleza, V.(1989), Utilization of leather waste-190t Waterproof Outdoor Foam Foldable Stadium Seat Cushion: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[T6 Outdoor Waterproof Tactical Flashlight]

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

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Corrugated Steel Sheet Corrugated Steel Roofing Sheet,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[High Qlty Sequin Fabric Fancy Peacock Green Polyester Mesh 157]

Corrugated Steel Sheet Corrugated Steel Roofing Sheet, 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:High Flex Quality Roll Cheap Glitter Heat Transfer Vinyl Printing, Part I.Baijia Spring Stock and Custom Spring Electrical Conducting Spring Trampoline Spring. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Different Size Glass Test Tubes]

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Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Class One UV Laser Marking Machine for Jade Stone Ceramic Logo Mark]

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

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