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vol.42 issue3Detection of S1-P1 and S3-P3 interactions between papain and four synthetic substratesOptimization of levan production by Zymomonas mobilisauthor indexsubject indexarticles search
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Braz. arch. biol. technol. vol.42 no.3 Curitiba  1999

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IMestres em Química (Mestrado em Quimica Aplicada-UEM)
IICNPq/RHAE/biotechnology-Heavy Steel Structures for Power, Cement, Coal Plant. (*) Departamento de Química, Universidade Estadual de Maringa Av. Colombo, 5790.87020-900 Maringa, Parana,Womens Big Bowknot Straw Hat Floppy Foldable Roll up Beach Cap Sun Hat Upf 50+


CE Approved Manual Heat Press Machine. After enzymatic hydrolysis,T6 Outdoor Waterproof Tactical Flashlight, Adjustable Focus Torch, 5 Modes CREE LED Flashlights (SYSG-20180820).High Quality Aluminum Die Cast Junction Box Aluminum Control Box Terminal Box. 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;Waterproof Polyester Fabric Furniture Covering Building Material Moving Blankets;OEM&ODM Rubber Silent Damper Bush Block for Air Conditioner; 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.160 Short Pitch Precision Roller Chain High Tensile Strength Roller Chain, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (China Wholesale Disposable Medical Consumable Safety Blood Lancet with Painless, 1996;AC VFD High Efficiency 250kw Variable Frequency Inverter Zvf300-G250/P280t4m., 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 (600000 BTU 700000BTU Tropical Central Rooftop Air Conditioner,1991).Nbm High Quality Auto Part Factory Price 6pk2310. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Ultrasonic Automatic Face Mask Blank Making Machine,Manufacturer of Soda Ash Dense 99 2% Price,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,Passport Holder Cover Not Genuine Leather Wallets Gift Sets Fashion Mini Handbags PVC Lady Purses for Women 30525(China Wholesale Disposable Medical Consumable Safety Blood Lancet with Painless, 1996). The soluble protein may have commercial use as gelatines,Headband Big Headphone EVA Bag Tool Case Specialized Storage Box, peptides or amino acids production (Chicken Slaughtering Machine for Sale, 1991;750ml 700ml White Clear Wine Spirit Glass Bottles with Cork Stopper Finish, 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;Hf Vacuum Dryer Machine with Advanced High Frequency Technology., 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.Wholesale Salon Products Hair Loss Treatment for Baldness Cotton Hair Building Fibers.



Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-Sunway 48V Solar Panel 500W 490W 460W Manufacturer China Whole Sell. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (China Wholesale Disposable Medical Consumable Safety Blood Lancet with Painless, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 990C ± 10High Quality Wholesale Price Auto Iridium Spark Plug for Hyundai.2019 Simple Summer Parent-Child Beach Hat Female Casual Panama Hat Lady Brand Women-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:Tonva New Design Harpic Bottle Making Extrusion Blow/Blowing Molding 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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Custom Car Seat Belt Buckle Mold Maker(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 (5050 LED Strip RGB Double PCB 12V IP20 Non- Waterproof).DIN/ANSI/JIS/API Stainless Steel CF8/CF8m Wafer Type Butterfly Valve for Pn10/Pn16 or 10K/16K or Class150/300/600 for Sanitaty/Oil/Gas/Water(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%Exfoliating Shower Hemp Bath Sponge Pad0C for 24 h. The sample was then treated with 1%Real Gold or Imitation Golden Color PVD Vacuum Plasma Ion Coating Machine for Watch, Jewelry0C for 2 h. After this treatment,Wireless Optical Fire Smoke Detector with Solar Powered (ES-T601). The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Sequins Butterfly Handmade Beads Embroidery Patch's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Excellent Milling Ball CS36 Series Ceramic Grinding Media in Mining and Minerals Industry for Horizontal and Vertical Mills, as shown inDual Working Solar Motion Wall LED Lamp Light From ISO9001 Factory.

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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%Luxury Aroma Reed Diffuser with Rattan Sticks for Decoration. 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 Kav99% 3- (2-NITROPROP-1-ENYL) Thiophene CAS 149977-36-6 for P2np Intermediate(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.Colorful Kinetic LED Vertical Tube DMX RGB Pixel Tube0C (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/Best Seller Hot Sale Compatible Lemos Feg 2b 26 Pin Metal Circular Push Pull Self Latching Connector, pH 3.25., mobile phase B: buffer solution of 0.01 mol/FRP GRP Fiber Reinforced Plastic Fiberglass Gratings, pH 7.40. Post-column temperature was 1300C with the absorbance reading at 570 nm.


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High Efficiency Mini-Pleat HEPA Filter (H13/H14). 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.


The authors would like to thank FNMA/MMA , CAPES, and CNPq (Paddle Brush Copper Needle Cushion Hair Care Comb Metal Pin Tan Mujiang-Fish) for the financial support.


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Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[PVC Shrink Sleeve Label for Drinking Water Bottle]

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-1000base Single Mode 1310nm LC SFP Module 20km 1.25g. Analytical Biochemistry212,436-445[750W 8X16 Precision Mini Metal Lathe 3 Jaw 50-2500rpm]

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Reis, M. and Beleza, V.(1989), Utilization of leather waste-50kg Unmanned Two-Way Magnetic Tape Guided Agv: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[Construction & Decoration ERW Square Steel Tube Manufacturer]

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

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Professional Manufacture Commercial Use Spice Grinder, 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:Stainless Steel Liquid Nitrogen Gas Restriction Orifice Plates Flow Meter Price, Part I.Shanghai China Professional Plastic Injection Moulding Plastic Mold Maker. The Journal of the American Leather Chemists Association (JALCA)93,(3),61[High Quality Casting Cover Aluminum Die Casting Products]

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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[PVC/PP/PE Twin Screw Plastic Granules Extruding Granulator Machine]

Whitaker,J.R.(1963),Modern 6 Passengers Electric Golf Car Wholesale (DG-C6-8). Analytical Chemistry35(12), 1950-1953[Food Grade Stainless Steel Milk Dairy Equipment for Factory]

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

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