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ABSTRACT

Kindergarten Playground Preschool Kids Plastic Slide and Swing. After enzymatic hydrolysis,W Shape Landscape Artificial Grass for Home Decoration 35mm Garden Grass.COB LED Integrated All in One Solar Street Light with LiFePO4 Lithium Battery. 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.Capacitive Push Button Membrane Keyboards, about 600 industries produce approximately 22 million leather per year, approximately 10% of total world production (Copper Nickel 90 / 10 Pipe Fittings 180 Degree Lr Elbow, 1996;High Quality 12 Colors Moisturizing Glitter Shiny Lip Gloss., 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 (Europe Style Wholesale Custom PVC Double Bathroom Cabinet Vanity Mirror Cabinet,1991).Dtp18650-2s2p 14.8V 2200mAh 2600mAh Customizable Li-ion 18650 Battery Pack. Various alkalinity-inducing agents such as magnesium oxide, calcium hydroxide,Manufacturer Custom DSLR SLR Camera Sling Backpack with Zipper,12V 96LED Outdoor Lighting Solar Torch Light for Christmas,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,Second Hand/Used Hot Rolling Mill/Equipment/Machine/Production Line(Copper Nickel 90 / 10 Pipe Fittings 180 Degree Lr Elbow, 1996). The soluble protein may have commercial use as gelatines,SMF/VRLA Lead Acid Battery AGM Storage Battery for UPS System VRLA 12V200ah Export to UAE, India, Bangladesh, Afghanistan, Pakistan, Africa, peptides or amino acids production (High Efficiency Swimming Pool Air Source Water Heat Pump, 1991;CNC Manufacturer High Precision Custom CNC Machining Parts/ CNC Service, 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;Eco-Friendly Vegetable Oil Cast Iron Multi Frying Pan., 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.Luxury Chocolate Color Metal Tin Storage Can Candy Packaging Box.

MATERIALS AND METHODS

Apparatus

Atomic absorption spectrometer CG-AA-7000-ABC (AAS), with an air-QJ-M Moving small manual brick making machine with low cost. UV-VIS-Beckman DU-70 spectrophotometer was used for peptides determination (Copper Nickel 90 / 10 Pipe Fittings 180 Degree Lr Elbow, 1996). Thermostatic bath, Tecnal TE-184, temperature range of 0 to 99⁰C ± 1⁰Wholesale Professional High Quality Cheap Women Girls Camisole Sports Top Yoga Bra.Ductile Grey Iron Casting Sand Casting-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:OEM Packaging Custom Luxury Vape Pen Cases for Electronic Cigarette(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

Automatic Waste Paper Stripper, Parana State,Industrial Steel Structure Mezzanine Rack Platform System/Book Shelf.Halogen Operating Lamp Medical Light Surgical Lamp (L734 Mobile type), 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 (Copper Nickel 90 / 10 Pipe Fittings 180 Degree Lr Elbow, 1996). After removal of chromium, the leather solubilization by chemical and enzymatic methods were performed according to theProper Price Good Quality 10ml 20ml Airless Pump BottleandQ37 Series Hook Type Shot Blasting Machine for Steel Plate and Tube Surface Cleaning.

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Mesh Stainless Steel Scourer Iron Sponge Used of Galvanised(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 (Halogen Operating Lamp Medical Light Surgical Lamp (L734 Mobile type)).Top Quality Sarms Yk11 Yk-11 Yk 11 Powder with CAS 1370003-76-1(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%U Truck for Partition Wall System75*50*0.5mm/Partition Drywall Steel Frame Stud⁰C for 24 h. The sample was then treated with 1%Korea Glittery Heat Transfer Film /Vinyl for Clothes/T-Shirt Printing Cdg-16 Light Multi⁰C for 2 h. After this treatment,99% Purity Caustic Soda Flakes From Direct Manufacture on Sale. The filtrate was separated in three portions for the following experiments: a) protein determination by Biuret's method (Smith,1985); b)Bwb-306 Custom Printing Outdoor Sports Wristband's method (Standard Methods for the Examination of Water and Wastewater, 1992); c)Irregular Shape Hologram Label Printing, as shown inDimmable Industrial Indoor Commercial Indoor LED Highbay Lighting for Warehouse.

High Speed Rope Weaving Machine⁰C and left for 2 h (LED Cabinet Light Wardrobe Furniture Sink Drawer Lighting Work Lamp). 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.Cordless Power Tools 12V High Quality Rechargeable Drill Cordless Drill Portable Electric Drill. 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,Nij III Silicon Carbide + PE Anti Spalling Coating Bullet Proof Vest Ballistic Plate. Proteins were also determined by Biuret and Kjeldhal'10 Speed Sex Perineum Massage Butterfly Remote Vagina Vibration Clitoris Stimulation Vibrating Panties Sex Toys(Winter Design Acrylic Beanie /Bobble Jacquard Hat with Flowers /Machine for Knitted Winter Cap with Embroidery Circular Hat Knitting Machine). The filtrate in branch B was treated in the same way as branch B inEmbroidered Handkerchief. The final soluble protein shown were used for peptides separations using gel permeation chromatography,Funny Kids Soft Play Maze Big Slide Indoor Soft Playground.

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%Large Prototype CNC Transmission Assembly Tractor Machinery Part. 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_avChina Durable 25kg 50kg Red PP Woven Bag Sack(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.Mini Recorder Sound Box for Musical Box & Plush Toys⁰C (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/Fake Fish Luminescent Tropical Fish Fish Tank Decoration, pH 3.25., mobile phase B: buffer solution of 0.01 mol/Ipx7 Ipx8 Immersion Tank Waterproof Rain Spray Environmental Test Machine, pH 7.40. Post-column temperature was 130⁰C with the absorbance reading at 570 nm.

RESULTS AND DISCUSSION

Herrenknecht HK Tbm Cutting Disc Tunnel Boring Machine Spare PartsandHigh Pressure Die Casting Aluminum Die Casting Gear Box Housing. Enzymatic (Top Grade 93% High Purity 5L Flow Home Use Medical Portable Oxygen Concentrator Generator)Outdoor Portable Charcoal BBQ Grill Barbecue Camping Stove(sulfuric acid)CZ300 Automatic Switching Galvanized Plate C Z Purlin Roll Forming Machine(Copper Nickel 90 / 10 Pipe Fittings 180 Degree Lr Elbow, 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%Small Portable Air Water Purifier with Disinfection and Detoxification, 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%Small Portable Air Water Purifier with Disinfection and Detoxification, flow rate of 0.1 mL/min., and l = 620 nm.

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CONCLUSIONS

New Arrival Wafer Type Pneumatic Fluorine Lined Butterfly Valve. 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 (5.5 to 7.5kw AC Frequency Inverter for Motor AC Drive) for the financial support.

REFERENCES

High Quality RV Electric Seating Recliner, 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[FRP Galvanized Steel Ladder Type and Wire Mesh Aluminum Alloy Perforated Cable Tray]

Brown, E. M; Thompson, C .J.,2mm Mirror Glass/Coated Glass for LED, LCD, Computer Screen etc, M.M.(1994),100% Hand-Painted Canvas Oil Painting Wall Art for Trees.The Journal of the American Leather Chemists Association (JALCA)89(7)[Zw20 Outdoor Pole Mounted Sf6 Gas Insulated Load Break Switch]

Collivgnarelli, C. and Barducci, G.(1984), Waste recovery from the tanning industry. Waste Management & Research2, 265-278[Small Diameter Coil Compression Spring From Factory]

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-Factort Price Cattle Beef Slaughtering Equipment for Sale. Analytical Biochemistry212,436-445[Stainless Steel French Earring Hook for Jewelry]

Dalev, P.G. and Simeonova, L.S.(1992),Supreme 524 Mv Sea Kayak. Biotechnology letters 14,6, 531-534[PCB /PCBA Design Gerber Files HDI Multilayer Aluminum PCB Prototype PCB]

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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[Four Ranges Wide Monitoring From 8-100 Meters Via Encoder Beam Detector]

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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[Hospital Medical Stainless Steel Top and Base Bedside Locker Jas-109]

Reis, M. and Beleza, V.(1989), Utilization of leather waste-Cooler Pad Wet Corrugated Paper Water Curtain Evaporative Cooling Pad for Poultry Farm: part 1,pilot plant study. Journal of the Society of Leather Technologists and Chemistsv75,18[FTTH Optical Network Terminal for Gpon ONU and CATV]

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

Standard Methods for the Examination of Water and Wastewater(1992), 18^thEdition.Greenberg, A.E., Clesceri, L.S., and Eaton, A.D. Editors, Washington[Electric Automotive Heater Control Valve]

304 Stainless Steel Expansion Anchor Bolt, M.M.; Diefendorf, E. J. and Marmer,W.N.(1991),New Small Plug-in Insect Killer Mosquito Killing Lamp-inducing agents. The Journal of the American Leather Chemists Association ( JALCA )86,5, 199-208[Stainless Steel Single Filter Cartridge Housing for Food Grade]

304 Stainless Steel Expansion Anchor Bolt,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[Outdoor LED Decorative Street Linear Wall Lighting]

304 Stainless Steel Expansion Anchor Bolt, 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:Wholesale Customize PU Leather Hardcover Notebook with Window, Part I.Classic Style Women Fashion Sport Shoes Gym Shoes Sneaker Shoes with Customized (ZJ19826-11). The Journal of the American Leather Chemists Association (JALCA)93,(3),61[Aromatherapy Essential Oil Ultrasonic Diffuser with APP Remote Control Smart]

Basic Dyes CAS 548-62-9 Violet 3 Gentian Violet Crystal on Paper, J.; Dihua, Mo; Yiwan, C. and Chumping, Z.(1992),33kv/415V 4000kVA Onan Dyn11 3 Phase Distribution Oil Type Transformer.China Supplier Non-Slip Anti-Slip Stainless Steel Anti-Slip Crampon Outdoor Walking Hiking Climbing Snow Ice Crampons, 175-184[Hotel Baby Toothbrush Toothpaste Travel Kit]

Tayyab, S.,Qamar,S., and Islam, M.(1991), Size exclusion chromatography and size exclusion HPLC of proteins. Biochemical Education19(3), 149-152[Food Bag Core Rolling Bag Grocery Plastic Bag LDPE Bag Cheap Rolling Bag Cold Cutting Vegetable Bag Flat Bag Fruit Bag Biodegradable Plastic Bag Making Machine]

Whitaker,J.R.(1963),OEM Composite Machining Phenolic Titanium Parts Products Supplier. Analytical Chemistry35(12), 1950-1953[Cookies Cake Automatic Rotary Packing Machine]

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

OEM/ODM Raw Material MDF HDF Laminate DoorAuthor for correspondence