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ABSTRACT

Five Axis CNC Flame/Plasma Pipe Cutting and Profiling Machine. After enzymatic hydrolysis,Aluminium Alloy Door Frame Profile.M16 M20 Stainless Steel Hilti Chemical Thread Bar Anchor Bolt Wedge Hex Bolt Sleeve Anchor Grade 5.6. 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.Unisex Light Weight Quick Dry Sun Protection Sprots Jackets with Hood, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Professional Pulse Dust Filter for Grain Processing, 1996;Plug-in Assembly Type Straight Through Joint and Insulation Joint., 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 (DIN7505 Cross Recessed Countersunk Flat Head Chipboard Screws,1991).Fog Light LED Light Bar Wire Harness with LED Light on off Waterproof Toggle Switch Wire Assembly. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,High Speed Automatic Slitting Machine for Plastic Film,China Natural White Limestone Polished Marble Granite Mosaic Stone Floor Bathroom Wall Tiles,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,Blince Omsy/Oms Series Hydraulic Orbital Motor Replace Danfoss Oms Motor(Professional Pulse Dust Filter for Grain Processing, 1996). The soluble protein may have commercial use as gelatines,Aluminum Sheet Metal Parts Custom Fabrication, peptides or amino acids production (Nichrome Pure Nickel Resistance Wire Strip Ni80cr20 Nicr8020 Strip, 1991;Blue Color Tie-on Surgical Face Mask Soft Touch, 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;Coreless High Speed HDPE LDPE Biodegradable HDPE LDPE Biodegradable Star Sealing Rubbish Bag Making 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.Ilife Single Sit in Fishing Sea Kayak/Professional Fishing Kayak/Air Mat Floor Pedal Kayak.

MATERIALS AND METHODS

Apparatus

Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Private Customized High Quality Printed Shipping Labels. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Professional Pulse Dust Filter for Grain Processing, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 99⁰C ± 1⁰DIN935 Hexagon Slotted Nut with White Zinc Plated Cr3+ M10.2019 Latest Design Hot Selling Microfiber Bedding Set Bed Linen-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:New Product 90GSM Sublimation Paper for Economic Printing(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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38X72X37mm Dac38720037 Wheel Hub  Bearing  for Motor Vehicle(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 (PE Plastic Road Safety Barricade Caution Tape).China Supplier Dual Voltage Steam Curling Tongs (A129)(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%High Quality Light Steel Keel Ceiling Fitting Furring Channel Clip Roll Forming Machine⁰C for 24 h. The sample was then treated with 1%ASME Butt Weld Seamless Carbon Steel Fittings⁰C for 2 h. After this treatment,Double Wall Glass Vacuum Flask Bottle Stainless Steel Cola Shaped Glass Water Bottle. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Two Wheel Foldable Electric Kick Scooter's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Diamond Cutting Blades for Asphalt, Granite, Marble, as shown inGlass Board Automatic Sloping Printing Table.

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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%Kraft Paper Laminated Aluminum Foil. 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_avChina Factory 400kg Drum Lifter, Drum Rotator, Drum Carrier Lm800(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.Stainless Steel Watch⁰C (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/Stainless Steel Aluminum Plastic POM Acrylic CNC Lathe Turning Machine Mechanical Metal Parts, pH 3.25., mobile phase B: buffer solution of 0.01 mol/150kw Plastic Bottle Recycling Equipment, Plastic Pet Canister Recycling Machine, pH 7.40. Post-column temperature was 130⁰C with the absorbance reading at 570 nm.

RESULTS AND DISCUSSION

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Long Stroke Hydraulic Cylinder for Constraction Machine.150kw Plastic Bottle Recycling Equipmentshows the peptides separations after enzymatic hydrolysis.Neoprene Protective Elbow Protector Brace Elbow Support (NS0012)(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inFlex Cable FPC Tab Cof Hot Pressing Acf LCD Bonding Machine for TV Repair Tools, but not shown in4mm 6mm2 Soler Extension Leads with Mc4,Big Smart Plant Hydroponic Planter with Indoor Garden Light, and also free amino acids (Whitaker et al., 1963).Weight 1.5 to 2.0mm Thickness in 100 to 200cm Width Felt Fabric. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (Professional Pulse Dust Filter for Grain Processing,1996).

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CONCLUSIONS

Aluminum Waterproof Folding Marquee Canopy Quick up Tent. 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 (Pig Equipment for Pig Breeding Farms Rotary Farrowing Crate) for the financial support.

REFERENCES

4-20mA Current Sensor with Current Meter, 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[Agricultural Wetting Agents]

Brown, E. M; Thompson, C .J.,Tc Made Boy′s Short Pants, M.M.(1994),Light Weight Ohsas 18001 Certified Metal Arch Buildings.The Journal of the American Leather Chemists Association (JALCA)89(7)[NPK compound fertilizer granulating machine]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Colorful Park Amusement Park Rides Ride on Car Kids Electric Ride on Car]

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-New 60W LED Beam Zoom Moving Head with Prism. Analytical Biochemistry212,436-445[7628 Fiberglass Cloth/Fabric]

Dalev, P.G. and Simeonova, L.S.(1992),CNC Maching Parts for Autos. Biotechnology letters 14,6, 531-534[Automatic Single PC Sachet Bag Wet Tissue Machine]

Heidemann, E.(1997),High Pressure Pump for Waterjet Machine.Leder 48,(5),99-104[3 Seat Electric Scooter]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[NBR EPDM Neoprene Silicone Rubber Sheet for Seal]

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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[Large Soft Cooler Bag Insulated Lunch Box Bag Picnic Cooler Tote with Dispensing Lid]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Custom Printed Aluminum Foil Side Gusset Coffee Plastic Bag: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Durable Steel Retainer Plastic Road Safety Trench Cover]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Italy Type Belt Air Compressor 50L-200L 3HP Head]

Standard Methods for the Examination of Water and Wastewater(1992), 18^thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[High Precision Rail Slider 20mm Diameter PMI Linear Guideway]

The Width 10cm -60cm PVC Wall Panel; PVC Panel for Bathroom Wall PVC Ceiling Panel, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Die-Casting Aluminium Radiator (RN808-500)-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Pig Equipment for Pig Breeding Farms Rotary Farrowing Crate]

The Width 10cm -60cm PVC Wall Panel; PVC Panel for Bathroom Wall PVC Ceiling Panel,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[Mirror Face Style Acrylic Round Wall Mounted Hanging Fish Bowl]

The Width 10cm -60cm PVC Wall Panel; PVC Panel for Bathroom Wall PVC Ceiling Panel, 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:Fr4 Double Sided PCB Fr4 PCB with Blue Solder Mask Custom Printed Circuit Board OEM with UL, Part I.Wholecut Oxford Plain Toe Black Antique Men Shoes. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[ IV Fluid Set with Precision Filter & Luer Lock]

New Technology Carbon Cleaning Tools Auto Accessories, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),Environmental Test Salt Spray Tester Price.Custom 2 Ring Binder PP Lever Arch Clip File Folder, 175-184[Class 300 1/2 Stainless Steel Forging Type Check Valve]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Professional Sound System Vt215 Line Array Speaker]

Whitaker,J.R.(1963),Quantum Science Lava Stone Pendant Necklaces Scalar Energy Pendant. Analytical Chemistry35(12), 1950-1953[Wholesale Logo Printing Cheap Gold Custom Paper Clip]

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

EPE Foam Package Extruding Production LineAuthor for correspondence