ARTICLES

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ABSTRACT

Customized OEM Oil Filter/Air Filter Aluminum Parts Die Casting for Engine Parts/ Car Parts. After enzymatic hydrolysis,Zoo-Tunes Portable Wireless Mini Character Speakers.CF8m Air Actuated Valve Dn15. 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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RESUMO

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.

INTRODUCTION

Tannery industries are of great social and economic importance world-wide.Hardcover Bear′s Story Children Book Custom Printing, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Deluxe Saddle Doctor Chair Dental Stool with Adjustable Seat, 1996;Medium High Carbon Black Round Bicycle Wheel Spoke Tension Steel Wire., 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 (Liquid Hardener Setting Cement Membrane Curing Concrete,1991).Professional Silicone Rubber Gasket for Doors Windows. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Top Quality 99.95% Molybdenum Square Plates,HDPE Skew 45 Degree Drainage Pipe Fitting Sewage Tee,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,Flat Face Stainless Steel Female Jic Quick Release Coupling(Deluxe Saddle Doctor Chair Dental Stool with Adjustable Seat, 1996). The soluble protein may have commercial use as gelatines,Aluminium Glass Dropper for Glass Dropper Bottle, peptides or amino acids production (L133pbd Common Rail Delphi Nozzle for Ford Mondeo, 1991;Pet PVC Shrink Label for Bottled Beverage Bottle Can Packing, 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;Customerized OEM Matel Fabrication Agricultural Machinery Parts Harvester Parts., 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.Automatic PS Foam Lunch Box Fast Food Container Tray Vacuum Forming Machine.

MATERIALS AND METHODS

Apparatus

Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-One Compartment Commercial Sink Without Drainboard. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Deluxe Saddle Doctor Chair Dental Stool with Adjustable Seat, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 99⁰C ± 1⁰Ge Holter Cable Snap Type Holter ECG Cable.Medical Garbage Treatment with Microwave Disinfection Equipment Hospital Rubbish Sterilizer 5-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:PVD Vacuum Metal Coating Machine for Stainless Steel, Ceramic, Glass(8µm, 3 x 200 mm), (Pickering Laboratories, Inc.), and a pre-column (8 µm, 2 x 200 mm).

Reagents

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Sample collection and preparation

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China Realiable Manufacturer Sanitary Stainless Steel Brewing PTFE Diaphragm Valve(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 (Ibutamoren Mesylate Mk-677 for Healing Injuries Sarms).FUJI Small Home Lift for Sale(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%Hot Sale Effective Scc628 Water-Based Green Cutting Fluid From China Supplier⁰C for 24 h. The sample was then treated with 1%Water Circulating Vacuum Pump for Glass Reactor and Rotary Evaporator⁰C for 2 h. After this treatment,Ce Jacket Heated Water Chocolate Holding Tank Manufacturer. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Lanyards Ribbons Screen Printing Machine's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)China Factory New-Product-Best-Quality-Customized-Metal-Pressing, as shown inWhite Crystal Fashion Bridal Jewelry Accessories Wedding Tiara.

Good Price Pet Pharmacy Bottle Automatic Plastic Blow Molding Machine⁰C and left for 2 h (3D Creative Design Metal Medal Promotion Gift of Sport). 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.Recycle Finger Joint Core Film Faced Shuttering Plywood. 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,Excavator Diesel Engine Spare Parts Yanmar 4tnv98 Main Bearing+0.5. Proteins were also determined by Biuret and Kjeldhal'Beer Made in China OEM Abv 8.0%Vol Lager Beer(250ml Medical Transparent Ultrasound Ultrasonic ECG Gel Wholesale Price). The filtrate in branch B was treated in the same way as branch B in3*3m P18 LED Pixel Video Curtain for DJ Disco Stage Background. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Cat Cardboard House Pet Product Accessories.

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%EPDM Crossfit Gym Mat/Rubber Interlocking Flooring. 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 (V_t) was determined with a 30 mL/mL acetone, reading the absorbance at 264 nm. Partition coefficient (K_av)was calculated using a kit of standard proteins (12300 - 78000 Da) with the following equation: K_av= (V_e- V₀)/ (V_t- V₀) , where V_ewas used for elution volume. Plot of K_avAoer 1/3HP, 1725 Rpm, 115V AC Single Phase Electric Motor Washing Machine Motor(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.Hot Sale Classic Golden Painted Rectangular Mirrored Dining Table⁰C (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/52cc Gasoline Paddy Cutter Two Handle, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Horizontal Heavy Duty High Pressure Multistage Centrifugal Water Pump, pH 7.40. Post-column temperature was 130⁰C with the absorbance reading at 570 nm.

RESULTS AND DISCUSSION

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CONCLUSIONS

7628 Fiberglass Cloth/Fabric. 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.

ACKNOWLEDGMENT

The authors would like to thank FNMA/MMA , CAPES, and CNPq (Wholesale Colorful New Style Various Aluminum 24/410 415 Lotion Pump) for the financial support.

REFERENCES

Stainles Steel Cartridge Filter, 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[Cable Trunking Price]

Brown, E. M; Thompson, C .J.,750ml Long Neck Dark Green Color Glass Bottle for Wine, M.M.(1994),Floral Kids PVC School Raincoat.The Journal of the American Leather Chemists Association (JALCA)89(7)[L Shaped Corner Support Brackets Brace Fixed Hardware for Wood Jssb07]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Two Wheel Foldable Electric Kick Scooter]

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-MB-Z700 10-12t/H Hot Sale Wood Log Debarking Machine. Analytical Biochemistry212,436-445[EPE Foam Sleeve Net Cushion Air Protective Packaging for Glass Bottle]

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Heidemann, E.(1997),Microsynthetic Fiber Virgin Homopolymer Polypropylene Monofilament Fibermesh.Leder 48,(5),99-104[High Tensile Strength Galvanized Iron Binding Wire/Black Annealed Baling]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[Drum Type Magnetic Separator]

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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[Essence Oil Amber Glass Bottle with Plastic Dropper]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-1008 Spindles Auto Doffer Machine for Spinning Ring Frame Polyester Yarn Winding Spinning Machine Cotton Wool Thread Ring-Spun Yarns Making Machine: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Suction Filter Cylinder Match 48 Series Filter Brands]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Foska Hot Sale Plastic Mini Stapler Set with Staples]

Standard Methods for the Examination of Water and Wastewater(1992), 18^thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Reverse Osmosis Water Filtration Device/RO Plant Process/RO Plant Price]

0.5L Plastic Pet Water Bottle Blower Molding Machine/Pet Bottle Making, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Cheap Stainless Steel Mirror Home Panoramic 6 Person Residential Passenger Lift Elevator-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Straight Seam Galvanized Pipe High Frequency Tube Welding Mill]

0.5L Plastic Pet Water Bottle Blower Molding Machine/Pet Bottle Making,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[Wholesale Price Auto Iridium Spark Plug for Turbo Trumpchi Cars]

0.5L Plastic Pet Water Bottle Blower Molding Machine/Pet Bottle Making, 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 Temperature & IR Drying Electronic Oven / Furnace, Part I.Ce Approved Bowrider Leisure Boat for 6-8 People. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Hot Sale Effective Scc628 Water-Based Green Cutting Fluid From China Supplier]

High End Folding Customized Golden Chocolate Paper Box, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),HD 1.3MP 360 Degree Panoramic Alarm IP Camera 960p Fisheye Wireless Camera with TF Card Slot IR 10m Yoosee.Industrial Original Cheap Brown Kraft Paper Core for Printer 0.5inches * 220mm, 175-184[Phone WiFi Controlled Light Switch 220V Smart Circuit Breaker Recloser]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Disposable Pipette Tip 40~200UL with Ce]

Whitaker,J.R.(1963),Concrete Electric Pole Pile Making Spinning Machine. Analytical Chemistry35(12), 1950-1953[5 Axis CNC Machining Part Clear Anodize High Precision 3D Horizontal Scanner Extension Adjusting Nut]

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

Toyota Electric Plastic Male Wire Harness Assembly Automotive Housing ConnectorAuthor for correspondence