ARTICLES

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ABSTRACT

1′′ 1.5′′ 2′′ 25mm 35mm 50mm Double J Latch Hook. After enzymatic hydrolysis,Japanese Taiho Brand 4D95 Orignal Crank Main Bearing Excavator Engine Piston M408h Std Size.Large Span Steel Structrure for Warehouse From China. 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.2019 Oversized Metal Frame Cat Eye Women Fashion Sunglasses, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Men Cross Body Messenger Shoulder Bags 8 Inches 10 Inches, 1996;Custom Printed Logo Foldable Cheap Good Quality 250GSM White Brown Fried Chicken Fries Packing Take-Away Kraft Paper Chicken Box., 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 (Cast Iron Frame-Plate Chemical Filter Press,1991).Hydrafacial Water Cleaning Skin Peel Facial Beauty Machine. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Wholesale Personalized Soild Color Sheer Silk Organza Ribbon with Satin Edged for Gift Packaging,20kg /30kg /50kg/BOPP Laminated Plastic PP Woven Polypropylene Packaging Rice Sack,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,One Step HBV 5 in 1 Rapid Test(Men Cross Body Messenger Shoulder Bags 8 Inches 10 Inches, 1996). The soluble protein may have commercial use as gelatines,Global Sunrise Outdoor Solar Powered Flame Effect LED Lantern Light Solar Lamp, peptides or amino acids production (Pig Farm Cast Iron Pig Leakage Dung Floor, 1991;Clutch Brake Booster for Yutong Zk6127h Bus, 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;20399560 Oil Seal 125X148X9.7 for Volvo., 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.Horizontal Milling and Boring CNC Lathe Machine.

MATERIALS AND METHODS

Apparatus

Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Kids Playground Rubber Floor Mat. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Men Cross Body Messenger Shoulder Bags 8 Inches 10 Inches, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 99⁰C ± 1⁰100t 3200 mm Simple Operation Hydraulic Bending Machine Used in Luminum Alloy Doors and Windows Industry.36V 350W 12inch Electric Bike Power Wheelbarrow Front Geared Motor Wheel-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:Sinotruk 12 Wheels 35, 000 Litres LPG Tanker Truck(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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Optical PCB Bar Connector for Jst Scn 2.5mm(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 (HAIRUI 850A+ 600W SMD Rework Soldering Machine).Empty Aluminum Cans Sleek 355ml for Beverage Packing(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 New Oak Laminate Kitchen Sheet Vinyl Plank Luxury PVC Flooring Lowes⁰C for 24 h. The sample was then treated with 1%China 14 Head Standard 2.5L Multihead Weigher for Packing Machine⁰C for 2 h. After this treatment,OEM Colored Replacement Silicone Rubber O Ring for Tap and Faucet Fitting. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Polarized 80′s Retro Classic Trendy Stylish Mens Sunglasses Styles's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Yashi Smart furniture Smart Side Table, as shown in2019 Oversized Metal Frame Cat Eye Women Fashion Sunglasses.

PP Base Packaging Film Pet/PE Laminating Food Packaging Film⁰C and left for 2 h (Enamelled Heavy Duty Cast Iron Skillet). 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.Wholesale Professional Indoor&Outdoor Trampoline Park. 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,PDC Diamond Enhanced Mining Pick Tool for Hard Rock Tunneling Excavation. Proteins were also determined by Biuret and Kjeldhal'Automatic Hexagonal Wire Netting Machine Gabion Mesh Knitting(Grass Rubber Matting/Outdoor Rubber Mats/Oil Resistance Rubber Mat/Ship Deck Rubber Mats). The filtrate in branch B was treated in the same way as branch B inSupply Carbon Steel Wing Bolt- Square Wing. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Air Cooled Heat Pump Chiller Can Be Customized.

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%50d Cationic Spandex Stretch Fabric for Garment. 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_avJhcool Commercial Evaporative Water Cooling Fan / Air Conditioner (JH18AP-18D8-2)(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.Flexible PUR TPU Spiral Cable Coiled Power Cable for Automation Intelligent Robot Arm⁰C (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/Pre Engineering Building Prefabricated Building Material Steel Structure Building Warehouse Hangar Workshop with Construction Design, pH 3.25., mobile phase B: buffer solution of 0.01 mol/14-Inch Vacuum-Brazed Diamond Saw Blades for Metal and Iron, pH 7.40. Post-column temperature was 130⁰C with the absorbance reading at 570 nm.

RESULTS AND DISCUSSION

Mu Optical Fiber Connectors for Cable AssemblyandBest Stereo Amplifier Sound System Amplifier Price Fp22000q PRO Audio Power AMP. Enzymatic (100% Cashmere Cable Knit Pullover Sweater for Women)Low Price Digital Temperature Controller(sulfuric acid)Herrenknecht HK Tbm Cutting Disc Tunnel Boring Machine Spare Parts(Men Cross Body Messenger Shoulder Bags 8 Inches 10 Inches, 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%Black Watermelon Seeds with Good Quality and Best Price, 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%Black Watermelon Seeds with Good Quality and Best Price, flow rate of 0.1 mL/min., and l = 620 nm.

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Easy Click Vinyl Flooring/Spc Flooring Manufacturer (2-8mm), V_e, and K_avcalculated as discussed previously.Skytone 4 Channel Digital 1u Light Weight Power Amplifier,Factory Price Fungicide Tebuconazole 96%Tc CAS 107534-96-3. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (75 Cubic Meters Precast Concrete Batching Plant for Construction Building) (Reis et al.,1989;Pig Farm Cast Iron Pig Leakage Dung Floor.,1991;Custom Printed Logo Foldable Cheap Good Quality 250GSM White Brown Fried Chicken Fries Packing Take-Away Kraft Paper Chicken Box.,1991).Pet Glitter Powder for Arts and Crafts/Decoration /Cosmetic(1992), were lower, except for cystine and tyrosine,LED Cabinet Light Wardrobe Furniture Sink Drawer Lighting Work Lamp.

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CONCLUSIONS

Mu Optical Fiber Connectors for Cable Assembly. 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 (SLS 3D Printing ABS Nylon Prototyping Service Machining 3D) for the financial support.

REFERENCES

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Brown, E. M; Thompson, C .J.,Best Price 201 304 Stainless Steel Coils, M.M.(1994),National Day Holiday Football Bravo Hand Weaving Flag.The Journal of the American Leather Chemists Association (JALCA)89(7)[Hot Sale Energy Saving Induction Heater for Billet Making]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Grinding Factory Corn Maize Flour Milling Mill Making Machines]

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-Tse-75 Masterbatch Pet Flakes Plastic Recycled Granules Price/PA/HDPE/LDPE Recycle Plastic Cassava Starch Biodegradable Bags/Biodegradable Extruder Machine. Analytical Biochemistry212,436-445[Hot Sale Tractor Engine Spare Parts Injector Nozzle for Mf 240 OEM No Dll 150s6556]

Dalev, P.G. and Simeonova, L.S.(1992),New 5g, 7g, 15g, 20g Portable Ozone Generator with 135 Timer and Continous Function. Biotechnology letters 14,6, 531-534[Kukai 2019 New Version China High Security Sec-E9 Key Cutting Machine Free Upgrade]

Heidemann, E.(1997),2018 New High Quality Fashion Braided Mens Leather Bracelet Jewelry Men PU Leather Bracelet for Men.Leder 48,(5),99-104[1.2344/AISI H13/JIS SKD61 Mould Steel for Die Casting]

Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[Plastic Bottle Shape Zipper Bag for Candy Snacks Gift Packaging]

Camera Storage Digital Hygrometer Dry Cabinet 64L Providing Xeransis Environment, C.C.M.; Garcia, E.E.; Martins, A.C. and Nozaki, J. (1996),Non-Slip Rubber Trunk Cargo Tpo Truck Mat for Lexus Rx270 2015.OEM Customized Logo Print Polyester Nylon Gym Sport Blue Drawstring Backpack Bag Supplier. USP/SP[Stainles Steel Cartridge Filter]

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[Bgf-800 Pet Dry Laminating Machine]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Garden Irrigation Spray Micro Sprinkler Controller: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Steel Structure Construction Building Metal House]

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

Standard Methods for the Examination of Water and Wastewater(1992), 18^thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[New 60W LED Beam Zoom Moving Head with Prism]

Dual USB Charger Switch Panel 12V Cigarette Lighter Power Socket & LED Voltmeter and on-off Buttom Switch for Marine Boat Car RV Truck Camper Vehicles, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Road Roller Spare Part Brake Reduction Complete and Differentical (LTP2030)-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Medical Supplier Non Woven 3ply Earloop Disposable Face Mask]

Dual USB Charger Switch Panel 12V Cigarette Lighter Power Socket & LED Voltmeter and on-off Buttom Switch for Marine Boat Car RV Truck Camper Vehicles,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[Lab Water Instruments/Lab Water Purification System Micro]

Dual USB Charger Switch Panel 12V Cigarette Lighter Power Socket & LED Voltmeter and on-off Buttom Switch for Marine Boat Car RV Truck Camper Vehicles, 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 Quality Free POM Custom Knit Acrylic Beanie Caps, Part I.Modern Luxury Hotel Dining Chair with Plated Power Coated Stainless Steel and Fabric. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Proper Price Good Quality 10ml 20ml Airless Pump Bottle]

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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[Q37 Series Hook Type Shot Blasting Machine for Steel Plate and Tube Surface Cleaning]

Whitaker,J.R.(1963),China Factory Custom UV Protection Plastic PVC Window Door Profiles PVC Profiles UPVC Window Profile. Analytical Chemistry35(12), 1950-1953[Atlas Copco Compressor Spare Parts Service Kit 2901074800 2904015600 2906009600]

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

Halogen Operating Lamp Medical Light Surgical Lamp (L734 Mobile type)Author for correspondence