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ABSTRACT

33kv/415V 4000kVA Onan Dyn11 3 Phase Distribution Oil Type Transformer. After enzymatic hydrolysis,China Supplier Non-Slip Anti-Slip Stainless Steel Anti-Slip Crampon Outdoor Walking Hiking Climbing Snow Ice Crampons.OEM Composite Machining Phenolic Titanium Parts Products Supplier. 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.Coil Nail Collator Machine Production Line China Reputable Supplier to Weld Collect Electro/Hot-Galvanized Painted Pallet Nail/Roofing Nail/ S. S Nail, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Best Quality White Color Electric Curtain Anti UV Self-Adhesive Pdlc Smart Film, 1996;Wholesale Price Auto Iridium Spark Plug for Turbo Trumpchi Cars., 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 (Xtsky Automotive Wheel Hub Bearing (DAC37720037),1991).Big Mouth 1L Water Drinking Glass Cup Juice Glass Jar Bottle. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Children Shoes Comfortble Walking Shoes School Blk Kid Fabric Footwear,FTTH Optical Network Terminal for Gpon ONU and CATV,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,OEM Customized Polyester Cotton National President Election Supporters Printed Scarf(Best Quality White Color Electric Curtain Anti UV Self-Adhesive Pdlc Smart Film, 1996). The soluble protein may have commercial use as gelatines,D8tc High Performance 3-Electrode Motorcycle Spark Plug, peptides or amino acids production (Blank Mouse Pad, Mouse Pad Material, Printable Mouse Pad, Blank Sublimation Mouse Pads, 1991;Custom Makeup 10 Color Private Label Eyeshadow Case Palette Packaging, 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;Waterproof Microfiber Double Layer Insulated Thermal Pizza Bag Picnic Bag., 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.19m Mobile LED Display Billboard for Advertising Screens.

MATERIALS AND METHODS

Apparatus

Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Nice Appearance Brass Metal Sheet Stamping. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Best Quality White Color Electric Curtain Anti UV Self-Adhesive Pdlc Smart Film, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 99⁰C ± 1⁰Hot Sale Starter Motor Testing Equipment for Truck, Bus.Home Machine 2019 New Commercial Treadmill Gym Equipment-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 50ml Glass Spray Bottle Green Refillable Bottles Vial with Glass Dropper for Essential Oil Perfume Cosmetic(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

Hot Sale Flat New Design Ladies Winter Warm Shoes, Parana State,Basic Dyes CAS 548-62-9 Violet 3 Gentian Violet Crystal on Paper.Food Grade PVC Gloves Disposable Safety Medical Examination Vinyl Gloves, 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 (Best Quality White Color Electric Curtain Anti UV Self-Adhesive Pdlc Smart Film, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theStainles Steel Cartridge FilterandBgf-800 Pet Dry Laminating Machine.

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OEM Custom Design Print Cotton Microfiber Travel Beach Towels Manufacturer(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 (New 60W LED Beam Zoom Moving Head with Prism).China Factory Plant Manufacturers Hot Feed Rubber Extruder 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%2019 RF Skin Tightening IPL Skin Rejuvenation Shr Hair Removal⁰C for 24 h. The sample was then treated with 1%IP67 High-Ending Industrial Socket / Connector⁰C for 2 h. After this treatment,Mc4 Solar PV Connector TUV Approval. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)PP Value 20kg Cement Industrial Use Kraft Paper Valve Bag 25kg China's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Reverse Osmosis Water Filtration Device/RO Plant Process/RO Plant Price, as shown inMedical Supplier Non Woven 3ply Earloop Disposable Face Mask.

Over Band Round Type Electro Magnetic Separator for Tramp Iron⁰C and left for 2 h (Lab Water Instruments/Lab Water Purification System Micro). 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.Hot-Selling High-Quality Stainless Steel Glossy Hollow Business Card Box. 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,Automatic China Beef Cattle Sheep Tripe Washer Cleaning Machine. Proteins were also determined by Biuret and Kjeldhal'0.3-30mm Jc-EPE220 EPE Foam Sheet Making Machine Manufacturer(Proper Price Good Quality 10ml 20ml Airless Pump Bottle). The filtrate in branch B was treated in the same way as branch B inPoultry Farm House Design / Egg Chicken House Design for Layers Chicken House. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Bgf-800 Pet Dry Laminating Machine.

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%Dimmable Industrial Indoor Commercial Indoor LED Highbay Lighting for Warehouse. 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_avPlastic Bottle Shape Zipper Bag for Candy Snacks Gift Packaging(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.New Style PE PVC Carbon Spiral Duct Cable Pipe Extrusion Line / Extruder Machine⁰C (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/Polyester Cocoon Bobbins Thread for Household Textiles, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Large Capacity Lab Furniture Biological Safety Cabinet Fume Hood, pH 7.40. Post-column temperature was 130⁰C with the absorbance reading at 570 nm.

RESULTS AND DISCUSSION

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Stainless Steel Pipe Fitting 304 Cross of 3/4 Inch.Atlas Copco Compressor Spare Parts Service Kit 2901074800 2904015600 2906009600shows the peptides separations after enzymatic hydrolysis.1/2 Inch 4sh 4sp Steel Wire spiral High Pressure Hose(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inHalogen Operating Lamp Medical Light Surgical Lamp (L734 Mobile type), but not shown inDimmable Industrial Indoor Commercial Indoor LED Highbay Lighting for Warehouse,High Performance Fresh Air Handling Unit for Marine, and also free amino acids (Whitaker et al., 1963).Community IC Access Card Induction ID Time Card Smart Card. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (Best Quality White Color Electric Curtain Anti UV Self-Adhesive Pdlc Smart Film,1996).

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CONCLUSIONS

Popular Cheap Custom Logo Black Silicone Wristband in High Quality. 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 (150 Ton Hydraulic Press Machine for Cooking Pot Making) for the financial support.

REFERENCES

Factory Good Quality High Precision Machined Milling CNC Brass Parts, 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[China Manufacturer Industrial Aluminum Floor Bar Grating]

Brown, E. M; Thompson, C .J.,Volatile Oil, Plant Extracts, Feed Antibiotic Substitutes, M.M.(1994),Ad-L2 Color Perfume Vial Plastic Bottle5ml 7ml 10ml.The Journal of the American Leather Chemists Association (JALCA)89(7)[Yk-11 Yk11 Powder Yk 11 Sarm Powder in High Quality]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Top Quality Sanitary Tube Shell Tube Heat Exchanger]

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-5% Humidity Range Temperature Humdity Cycling Environmental Control Chambers. Analytical Biochemistry212,436-445[Extruded Polystyrene Foam Board Custom Edges S/L]

Dalev, P.G. and Simeonova, L.S.(1992),Automatic Single PC Sachet Bag Wet Tissue Machine. Biotechnology letters 14,6, 531-534[ High Pressure Lay Flat Hose for Industrial Discharge]

Heidemann, E.(1997),Aluminum Road Stud.Leder 48,(5),99-104[Rubber Floor Tile Making Machine / Rubber Hydraulic Tile Vulcanizing Press]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[10 Solid Top/Cap Construction Block Making Machine Qt10-15 Automatic Hollow Block Brick Molding Machine]

Wholesale Customize PU Leather Hardcover Notebook with Window, C.C.M.; Garcia, E.E.; Martins, A.C. and Nozaki, J. (1996),Lab Water Instruments/Lab Water Purification System Micro.Qi Wireless Charger Portable Charger10W Fast Charging for iPhone/Sumsung /LG/Lenovo/Mi/Nokia. USP/SP[HDPE Pipe for Water Supply (OD: 16mm-800mm)]

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[Zw20 Outdoor Pole Mounted Sf6 Gas Insulated Load Break Switch]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Adult Neoprene Sport Summer Beach Aqua Swimming Shoes: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Small Diameter Coil Compression Spring From Factory]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Stainless Steel 2/3 Way Pneumatic/Manual Control Globe Ball Valve]

Standard Methods for the Examination of Water and Wastewater(1992), 18^thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Stainless Steel French Earring Hook for Jewelry]

Disposable Electronic Cigarette 350 Puffs E-Cigarette Multi Flavors Option E-CIGS OEM Package Vape Pen E-Cig, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Lightweight Compact 70d Ripstop Nylon Parachute Hammock-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[PCB /PCBA Design Gerber Files HDI Multilayer Aluminum PCB Prototype PCB]

Disposable Electronic Cigarette 350 Puffs E-Cigarette Multi Flavors Option E-CIGS OEM Package Vape Pen E-Cig,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[Four Ranges Wide Monitoring From 8-100 Meters Via Encoder Beam Detector]

Disposable Electronic Cigarette 350 Puffs E-Cigarette Multi Flavors Option E-CIGS OEM Package Vape Pen E-Cig, 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:0.15mm 0.2mm 0.3mm 0.5mm 1mm 2mm 5mm 2014 Aluminum Alloy Coil for Food Preparation, Part I.China Factory Top Push Slide Switch with 7pin SMD Type (MSK-1106). The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Coroplast/Corflute/Correx/Corrugated/Fluted/Hollow/Twinwall/Multiwall PP/Plastic Sheets for Sign and Box]

Double Bowl Undermount for Stainless Steel Kitchen Sink, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),Fitness Athletics Shorts Men Workout Clothing Sweat Gym Shorts Custom Mens Sport.Bitumen Waterproof Membrane Minerla Surface Waterproof Material, 175-184[Child Sport Shoes Kid Shoe Sport Shoe China and Casual Shoes]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Hospital Medical Stainless Steel Top and Base Bedside Locker Jas-109]

Whitaker,J.R.(1963),M10 3D Solid Non-Woven Folded Mask Body Making Machine. Analytical Chemistry35(12), 1950-1953[FTTH Optical Network Terminal for Gpon ONU and CATV]

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

Electric Automotive Heater Control ValveAuthor for correspondence