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Print versionISSN1516-8913

Braz. arch. biol. technol. vol.42 no.3 Curitiba  1999

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150mm Interior Decorative WPC Ceiling Tiles PVC Wall Panels. After enzymatic hydrolysis,Best Design and Nice Price All in One Solar Street Light.Customized Large Ss Stamping/ Bending Sheet Metal Parts. 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;High-Quality 201 304 410 430 Grade Mirror Finish Stainless Steel Sheet;UV Laser Marking Machine (with Air Cooling System); 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.Energy Saving Street Light E27 E40 27W LED Corn Bulb, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Mechanical Seal, Auto Cooling Pump Seal, Automotive Water Pump Seal, 1996;Private Label Customized Teeth Whitening Activated Charcoal Toothpaste OEM., 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 (Aluminium Machining Parts Turning Service Coffee Machine Milling Machine Spare Parts,1991).High Quality Garden Tools 22t Carbon Steel Leaf Rake with Fiberglass Handle. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Ye3 Ie3 Premium Efficiency IC411 Tefc Three Phase AC Electric Induction Motor High Pressure Washer Ye3-160L-2 18.5kw,Air Compressor Replacement Parts 1622379881 2901146500 Automatic Drain Valve,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,Polished Tzm Molybdenum Alloy Plate(Mechanical Seal, Auto Cooling Pump Seal, Automotive Water Pump Seal, 1996). The soluble protein may have commercial use as gelatines,Iron Welded Gabion Basket Retaining Wall, peptides or amino acids production (Customizable Oxygen Concentrator 20 Lpm Pressure Swing Adsorption Plant, 1991;Manufacturer of Rice/Wheat Straw Sawdust Crushing Making Mill for Sale, 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;Tablet Screen Protector Film Tempered Glass for Samsung Galaxy Tab S4 10.5 T830 T835., 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.FTTX Solution Provider Fiber Optical 12cores MPO Cassette.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Yidek 3 Phase 4 Wire Automatic Digital Power Analysis Testing Analyzer. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Mechanical Seal, Auto Cooling Pump Seal, Automotive Water Pump Seal, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Aluminum Height Adjustable Cane.Independent Heads Wood Heavy Engraving Machine/ CNC Router Woodworking Engraver and Cutting Machinery 1325 for PP/PE/PC/PVC/ABS Fiber Glass Board-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:Large Batches Equipoise Light Yellow Liquids(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

Solid Wood Buffet Storage Cupboard Table Designs Cabinet Sideboard, Parana State,Unique Design for Handle Champange Glass Uesd for Hotel and Restaurant.Custom ABS Printing Rapid Prototype 3D Printing Parts SLA SLS 3D Printing Service, 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 (Mechanical Seal, Auto Cooling Pump Seal, Automotive Water Pump Seal, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theChina Supplier Rubber Injection Molding Machine with CeandCustom High Precision Micro Machining Service Brass Micromachining Parts.

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New Invention 2017 Male & Female Stainless Steel Quick Coupling(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 (Automatic Three Side Sealing Facial Mask Bag Making Machine).Driving System for Hybrid Stepper Motor Dm860A(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%Atf-805 Auto Transmission System Flushing Machine with CE/SGS0C for 24 h. The sample was then treated with 1%Sand Castings by Gray Iron Material0C for 2 h. After this treatment,Snf-B/Fdn-B/ Sodium Naphthalene Formaldehyde/ Water Reducing Admixture. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Food Package Aluminum Foil Tray Making Machine's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Business Class Eyeshade Quality Travel Eye Mask Sleeping Eye Cover, as shown inYutong Zhongtong Higer Golddragon Kinglong Bus Spare Parts Fan Belt.

Factory Price 6mm Stainless Steel Wire Rope 7*70C and left for 2 h (Plastic LDPE HDPE Pipe Tube Extrusion Production Line for Water Supply). 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.Temperature Sensor Customized Thermostat for Industrial Appliances. 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,Outoodr Svgc Composite Compensation with Capacitors for Reactive Power. Proteins were also determined by Biuret and Kjeldhal'2019 Wholesale New Notebook Computers for DELL Inspiron 17.3 Core I7-8550 16GB RAM 2tb HDD Radeon 530 DVD Win10 Laptop(Hydraulic Adapter and Connections for High Pressure Hose Hydraulic Fittings Double Pipe Nipple). The filtrate in branch B was treated in the same way as branch B inPod System No Nicotine. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Top China Forklift Supplier & Manufacturer.

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%Blue White Yellow Red Black Nylon Mosquito  Window Netting. 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 KavHot Sale Spraying Drying Equipment(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.LED Solar Powered Traffic Blinking Emergency Light0C (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/Die-Casting LED Projector Light 840W Outdoor Sport Field Light High Mast Light 150lm/W, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Fiberglass Pultruded Pipe, FRP Profiles, FRP Pultrusion Tube, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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Downspout Pipe Roll Forming Machine.5050 LED Strip RGB Double PCB 12V IP20 Non- Waterproofshows the peptides separations after enzymatic hydrolysis.4mm Vinyl Plank Floor Lvt Click Lock Wood PVC Spc Click Vinyl Flooring(Tayyab et al.,1991). The volume (peak) of 35 mL that appeared inDual Working Solar Motion Wall LED Lamp Light From ISO9001 Factory, but not shown inProfessional Gym Equipment Hammer Strength PRO Style Adjustable Bench,Novel in Design Plastic Injection Mold Tooling for 15L Dustbin Bucket Mould, and also free amino acids (Whitaker et al., 1963).Custom Stainless Steel Double Small Torsion Spring. The same results were observed using Biuret and Kjeldhal's methods for peptides analyses (Mechanical Seal, Auto Cooling Pump Seal, Automotive Water Pump Seal,1996).

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Small Leather Shoes Craft Laser Cutting Machine, Ve, and Kavcalculated as discussed previously.Protection Plate Custom Sheet-Metal Fabrication by Professional Workshop,Baby Toothbrush Kids Silicone Finger Brush, Baby Finger Toothbrush. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (School Kid Sport Travel Backpack Fashion Casual Promotional Bag (GB#20056)) (Reis et al.,1989;Customizable Oxygen Concentrator 20 Lpm Pressure Swing Adsorption Plant.,1991;Private Label Customized Teeth Whitening Activated Charcoal Toothpaste OEM.,1991).Durable Comfortable Rubber Non Slip Mouse Pad Wrist Rest(1992), were lower, except for cystine and tyrosine,China Manufacturer Industrial Aluminum Floor Bar Grating.

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Food Grade Stainless Steel Milk Dairy Equipment for Factory. 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.


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Sun-160 Full Automatic Electric Driven Weighing Cups Filling Packing Machine, 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]

Brown, E. M; Thompson, C .J.,Plastic Colored Custom Foam Shampoo Pet Bottle with Cosmetic Pump, M.M.(1994),Low Frequency 3000W 24V 230V Inverter with Battery Charger.The Journal of the American Leather Chemists Association (JALCA)89(7)[New Mobile Smartphone for Xiaomi 9 PRO]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Chuke 20W Optical Fiber Laser Marking Machine Printer Engraver]

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-Amazon Best Selling Sports Ankle Support Sleeves Compression. Analytical Biochemistry212,436-445[IP 44 Waterproof Indoor/Outdoor Aluminum Wall Mount 2-Way Column Speaker]

Dalev, P.G. and Simeonova, L.S.(1992),Pen Type pH Meter pH-031&0.00-14.00pH Tester. Biotechnology letters 14,6, 531-534[I9s Tws Wireless Earphone Portable Bluetooth Headset Earbud]

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Hill,R.L. and Schmidt,W.R.(1962), The complete Enzymic Hydrolysis of Proteins.The Journal of Biological Chemistry 237, 2, 389-396[450mm 500mm Diamond Saw Blade with Good Sharpness for Reinforced Concrete Cutting]

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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[PVC Shrink Sleeve Label for Drinking Water Bottle]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-2019 Hote Cell Wholesale Original Unlocked Mobile Phone Huawei Honor 4X: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[750W 8X16 Precision Mini Metal Lathe 3 Jaw 50-2500rpm]

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

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Sanitary Stainless Steel Heating Cooling Mixing Buffer Storage Tank]

Ce Approved Sperm Concentration Test for Sperm Density Test, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),Cao Content Plastic Additives Desiccant Masterbatch for Recycled Plastic-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Wide Jaws Adjustable Wrench with Big Grip Multi-Used (FM-W04)]

Ce Approved Sperm Concentration Test for Sperm Density Test,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[Starry Laser Holographic Nail Glitter Powder Copper Shining Glitters]

Ce Approved Sperm Concentration Test for Sperm Density Test, 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:Heating and Cooling Resistant HDPE Coated Polyurethane Foam Injection Foam Pipe Insulation, Part I.Sand Casting Parts Large Size for Industrial Use. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Hot Sale Biodegradable and Recycled Paper Straws]

Durable Steel Retainer Plastic Road Safety Trench Cover, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),Iron Cast Brake Drums for Trucks.Eco-Friendly Barware Food Grade Stainless Steel 304 Reusable Custom Straws, 175-184[Stainless 1 Inch Welded Steel Pipe Sch10 Sch40]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Construction & Decoration ERW Square Steel Tube Manufacturer]

Whitaker,J.R.(1963),Folding Aluminium Easy Move Choral Stage with Wheels for School. Analytical Chemistry35(12), 1950-1953[M4X10 Round Head Core Pulling Aluminum Nail]

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

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