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Print versionISSN1516-8913

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

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High Speed 3000W Fiber Laser Cutter. After enzymatic hydrolysis,Ebay Hot Sales Cordless Drill Horizontal Battery 18V Lithium Ion Battery.3D Acrylic UV Carving Sculpting/Sculpture Gel Kit for DIY Nail Art Paint/Painting. 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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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.UV Coated PVC Panel for Interior Wall Board, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Latest Design Jewelry Men Ring New Model 925 Silver CZ Ring., 1996;Shr IPL Elight Handle for Hair Removal Skin Rejuvenation Beauty Device., 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 (Wholesale 30W LED Down Lights with Budget Price,1991).Embossed Textured Wallpaper for Solvent Printing. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Promotional Jewelry Gift Paper Box with Ribbon and Inner Tray,4-14 Manual Staple Gun with Staples for Hand Tools,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,500 Watts High Speed 20 Portable Big Foot Ebikes (JL-TDN05Z-FAT-3)(Latest Design Jewelry Men Ring New Model 925 Silver CZ Ring., 1996). The soluble protein may have commercial use as gelatines,Smallest Portable Waste Transformer Oil Purifier Machine Zy-6, peptides or amino acids production (Hot Sale 5ml Portable Pocket Sized Travel Refillable Aluminum Perfume Atomizer Spray Bottles, 1991;High Speed Automatic Packing Machine (GK-650 BA), 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;5000-5900MHz 4G Built-in Automotive Antenna., 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.Glass Lined Reactor for Chemical Factory.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-OEM Metal Stamping Stainless Steel Parts with CNC Machining. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Latest Design Jewelry Men Ring New Model 925 Silver CZ Ring., 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10Tropical Custom Clear Christmas Poly Mailers Bag Mailing Envelopes for Paper.Supermarket Plastic T-Wire Basket Swing up Price Label Holder-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:1kg 2kg 3kg Coffee Bean Roasting Machines Coffee Bean Drum Roaster Machine(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

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2D LED Rope Lighting Motif Lights for Christmas Decoration(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 (Clay Tiles Making Machine with Latest Technology).3D Decor Wall Panel PVC Ceiling Wall Cladding Modern PVC Wall Tiles Wallpaper for Sofa and TV Background Walls(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%10ml Dropper Bottle for Skin Care Packing0C for 24 h. The sample was then treated with 1%Custom High Precision Micro Machining Service Brass Micromachining Parts0C for 2 h. After this treatment,7PCS/Set Eco Friendly Camping Travel Portable Reusable Natural Organic Bamboo Utensils Flatware Cutlery Set with Bag. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Replacement Cell Phone LCD for iPhone 6s Spare Parts's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)China Manufacturer Lm800 Forklift Trucked Mounted Drum Lifter, as shown inI-Tech 12000HD 2u Space Digital Professional Power Amplifier.

Explosion Proof Fog Cannon for Coal Plant0C and left for 2 h (PTFE Seat Wafer Butterfly Valve Pn16). 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.Silicone Large Non-Stick BPA Free Baking Mat Sheet. 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,19mic Black Cast PE Stretch Film for Pallet Wrapping. Proteins were also determined by Biuret and Kjeldhal'Design Automatic Egg Layer Poultry Farm Battery Chicken House for 10000 Laying Hens(Btk Iron Tramp Remover/Separator for Magnetic Mine/Magnetic Ore). The filtrate in branch B was treated in the same way as branch B in80kw 100kVA Soundproof Canopy Silent Electric Generator with Sdec Engine. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Custom Design Plush Panda Animal Slippers Comfort Foam Support by.

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%Best 6-Axis Electric Screwdriver Machine Robot. 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 KavCustom CNC Milled Precision Spare Part CNC Pen Automobile Parts(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.FTTH Embedded Type Sc Fiber Optic Fast Connector0C (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/Multi-Function Small Tree Digging Shovel/Tree Machine, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Automatic L Bar Sealer Shrink Tunnel Machine, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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Electric/ Customised Kitchen Hood AC Motor, High Efficiency, 230V, Blower, Humidifier, Exhaust Fan, Ve, and Kavcalculated as discussed previously.Construction Material Prepainted Aluminum Steel Coils, Color Coated Aluminum Coils,Supply Christmas Lace Gold Silver Offray Silk Ribbon. The contents of amino acids found in this work by HPLC were closely related to the values found by other authors (Lm Series Miniature Lm8uu Liner Ball Bush Bushing Ball Bearing) (Reis et al.,1989;Hot Sale 5ml Portable Pocket Sized Travel Refillable Aluminum Perfume Atomizer Spray Bottles.,1991;Shr IPL Elight Handle for Hair Removal Skin Rejuvenation Beauty Device.,1991).Products Genuine Leather En345-1 Steel Toe Cap Leather Safety Boots(1992), were lower, except for cystine and tyrosine,Toast Stamp Loaf Bread Tin Pan (ZMA).

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Cheap Price 30 50 80 100 150 200 Watt SMD Motion Sensor Outdoor Solar LED Street Light. 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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ISO9001 & Ce Certificated Superfine Cocoa Cake Powder Grinder Mill, 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[Chamber Dryer Manufacturers Cheap Price]

Brown, E. M; Thompson, C .J.,Wiskind Hot-Rolled Low Cost Commercial Steel Structure Greenhouse, M.M.(1994),Baking Soda 99.8% Min Sodium Bicarbonate.The Journal of the American Leather Chemists Association (JALCA)89(7)[Liquid Gas Tanker Semi Trailer / Propane Storage LPG Trailer]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Competitive Price Good Quality Custom Unisex Marle Grey Fleece Hoody]

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-BS1387 Class B 2 Inch Sch40 Gi Pipe Galvanized. Analytical Biochemistry212,436-445[Magnetic Mixer Mixing Tank with Bottom Agitator (MTK)]

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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[ Gym Sport Backpack]

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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[3 Colors Tactical Shooting Hunting Camouflage Clothes Suit]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Soosan Excavator Hydraulic Hammer for Construction Demolition: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Adjustable Mirror Surface Stainless Steel Sheet Pipe with Ce Certificate]

Smith, P.K.(1985), Colorimetric method for the determination of protein. Anal. Biochem.,150,76-78[Adjustable Lawn Rake Chrome Plated with or Without Handles]

Standard Methods for the Examination of Water and Wastewater(1992), 18thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[for iPhone 6 LCD 100% Brand New with Touch Screen Digitizer Assembly Replacement Display]

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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[8 in 1 3.1 USB C Type C Hub with 4K HDMI Adapter for MacBook PRO]

Whitaker,J.R.(1963),Nh4cl White Granular Agricultural Grade Ammonium Chloride. Analytical Chemistry35(12), 1950-1953[Automotive Bearings]

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

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