International Journal of Current Research and Review
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IJCRR - 4(21), November, 2012

Pages: 17-22

Date of Publication: 15-Nov-2012


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APPLICATION OF EXTRACTED PEROXIDASE ENZYME FROM TURNIP ROOTS (BRASSICA NAPUS) IN CLINICAL DIAGNOSTIC KIT

Author: Khaled E. El-Gayar, Mahmoud A. Ibrahim, Shimaa H. Mohamed, Zainab Zakaria, Amany S. Abd Alhameed

Category: General Sciences

Abstract:The peroxidase enzyme was extracted by juicing the turnip roots followed by centrifugation at 12000 rpm. Partial purification of the enzyme was carried out by precipitating of crude enzyme solution with solid (NH4)2SO4 and dialyzed against phosphate buffer saline (PBS) then fractionated by gel filtration on Sephadex G-75 column. The fractionation pattern of the pre-dialyzed enzyme illustrated that two peaks of protein content (absorbance at 280 nm) were present. The 1st peak contained most of the peroxidase activity. The 2nd peak contained other proteins. The enzyme activity showed 2.5 Ku/1ml when guaicol was used as a substrate. For glucose clinical diagnostic kit, two reagents were prepared: The 1st was commercial glucose kit as control. The 2nd was completely prepared using the extracted peroxidase (100 units/100ml reagent). The stability of the prepared kits was in agreement with those of commercial kit. They were stable up to one year when tested corresponding to the reference range of glucose; Normal: 74-102 mg/dl and Pathogenic: 235-325mg/dl.

Keywords: Peroxidase, Turnip, Extraction, Purification, and clinical diagnostic kit

Full Text:

INTRODUCTION
Peroxidases represent a group of enzymes widely distributed in the plant kingdom and has been extracted from several plants including horseradish (Armoracia rusticana), peach (Prunus persica), yam (Alocasia macrorhiza), manioc (Manihot utilissima), artichoke (Cynara scolymus), sweet potato (Ipomoea batatas), zucchini (Cucurbita pepo) and others. In this sense, another potentially interesting source of peroxidase is turnip (Brassica napus) 1, 2, 3 . Peroxidases are a group of haem – containing enzymes that present wide substrate specificity. The reaction catalyzed is the reduction of peroxides at the expense of electron donating substrates. This characteristic makes peroxidases useful in a number of industrial and analytical applications 4. They can be used for the treatment of wastewater containing phenols and aromatic amines, in bio-bleaching processes, in lignin degradation, in fuel and chemical production from wood pulp, and in the biotransformation of organic compounds 1, 4, 5 . Peroxidase enters in the production of Glucose, Uric acid, Triglycerides and Cholesterol diagnostic kits. Immunoassay techniques as ELISA with labeling of reactants by horseradish peroxidase and applying of its catalytic properties are proposed 6 . METHODS Extraction and partial purification of peroxidase from turnip roots: Peroxidase was partial purified from 10 kg of turnip roots as mentioned before 2,3,7,8. The roots were washed, sliced, and homogenized with 1 liter of distilled H2O in a blender. Homogenates were then filtered through four thicknesses of cheesecloth then centrifuged at 12000 rpm for 20 minutes. Solid ammonium sulfate (NH4)2 SO4 was added to crude enzyme solution to reach 65% saturation through stirring slowly in an ice bath. After standing at 4?C for one hour , the precipitate was removed by centrifugation at 12000 rpm for 30 minutes at 4C. Pellets were re ? -suspended in a small volume of phosphate buffer saline (PBS), pH 7.5 containing 10 mM CaCl2, and dialyzed overnight at 4C against the same ? buffer. Samples were then taken to determine enzymatic activity. The enzyme was purified further through Sephadex G-75 gel filtration column. Sephadex G75; 5 g was suspended in excess of PBS buffer containing 10 mM CaCl2 in order to be swelled. The slurry was poured carefully into (1.5 × 30cm) column. The bed height was adjusted to 30 cm by settling the gel beads. The column was then washed and equilibrated with PBS buffer at a flow rate of 36 ml/ hr using a peristaltic pump at 4C? . The dialyzed peroxidase was applied to the Sephadex G-75 column with the aid of an adaptor. The enzyme was eluted with PBS buffer, pH 7.5 containing 10 mM CaCl2 at a flow rate of 36 ml/hour. Fractions were collected at 4?C after which the absorbance at 280 nm (an indication for protein content) and the enzyme activity were determined. Active fractions were collected and re-precipitated on ice with solid (NH4)2 SO4. Peroxidase activity and total protein determinations: Peroxidase activity was determined in triplicate by measurement of the absorbance at 470 nm of tetraguaiacol. The reaction mixture was 450 µl 0.1M Acetate buffer, 750µl 0.04M guaicol, 200 µl , 0.02M H2O2 and 100 µl sample as described 9 . Unit of enzyme is that amount of enzyme which catalyses the conversion of one micromole of hydrogen peroxide per minute at 25°C. Total protein concentration was determined in triplicate, using bovine serum albumin as standard, according to Bradford method 10 . Protein electrophoresis (SDS – PAGE): The partial purified peroxidase was used for protein electrophoresis. For SDS-PAGE; 100µg from each sample were boiled in the presence of sodium dodecyl sulfate (SDS) and 2- mercaptoethanol then separated in a 12% gel according to Laemmli method 11. The proteins were stained with coomassie brilliant blue R-250. Glucose level assay Enzymatic determination of glucose: In order to determine the glucose concentration in human serum, two reagents were prepared: The 1st was commercial clinical glucose diagnostic kit. The 2nd was completely prepared in our lab using the extracted peroxidase (100 units/100ml reagent) as described before 12 . Assay Principle Glucose is determined after enzymatic oxidation in the presence of glucose oxidase. The formed hydrogen peroxide reacts under catalysis of peroxidase with phenol and 4-aminoantipyrine to form a red violet quinoneimine dye as indicator 12 . Glucose + 2H2O + O2 GOD Gluconic acid + H2O2 2 H2O2 +Phenol +4-amino-antipyrine peroxidase 4H2O+ Quinoneimine Procedure Ten µl specimen was added to 1.0 ml Reagent mixture (Phosphate Buffer; 100 mmol/L, Phenol; 4.0 mmol/L, 4-amino-antipyrine; 1.0 mmol/L, Glucose oxidase ; > 20 KU /L, Peroxidase ; > 2.0 KU/L and Sodium Azide 8 mmol/L.) Glucose standard (St) concentration was 100 mg/dl, 5.55 mmol/L .The tubes were mixed and incubated for 10 minutes at 37oC or 20 minutes at 15 -25oC. The absorbance of specimen (A specimen) and standard (A standard) against reagent blank within 30 minutes at 550 nm was measured.

Glucose concentration (mg/dl) = Glucose standard conc. x (A) specimen (A) Standard RESULTS AND DISCUSSION Extraction and partial purification of peroxidase from turnip roots The fractionation pattern of the pre-dialyzed enzyme sample (3ml each) using Sephadex G-75 column is shown in (Figure1). The pattern illustrated that two peaks of protein content (absorbance at 280 nm) were present. The larger peak (fractions 10–25) contained most of the peroxidase activity, with a maximum activity of 2.5k units/ml. The smaller protein peak (fractions 26-40) contained proteins other than peroxidase. SDS – PAGE was carried out to check the presence and purity of the peroxidase enzyme sample. About 100 µg protein sample from enzyme after dialysis, and enzyme after Sephadex G-75 column was applied separately to 12% SDS PAGE. Sample after dialysis showed several protein bands more than that after gel filtration but still it needs more purification. Previously, it was proved that; the molecular weight of peroxidase is located between 38 – 45KDa 4, 7,13,14,15. The results showed that peroxidase is located in this region and corresponds to a molecular weight about 40 KDa (Figure 2) as compared to the molecular weight marker (200 – 19 KDa). The results showed that; 10 Kilogram turnip roots gave 5 liter juice contained about 80 K units. After purification, it gave about 50 kilo units. This quantity satisfies for manufacturing of 50 liters Glucose kit reagents (500 kits/ 100Test). Glucose level assay Oxidation of glucose present in the peripheral blood represents the major source of cellular energy in the body. Dietary glucose is stored in the liver in the form of glycogen or converted to fatty acids and stored in the adipose tissues. The accurate estimation of glucose is important in the diagnosis and management of hyperglycemia and hypoglycemia. The most frequent cause of hyperglycemia is diabetes mellitus resulting from a deficiency in insulin secretion or action. Hypoglycemia may be the result of an insulinoma, insulin administration, and inborn error of carbohydrate metabolism or fasting. The concentration of glucose in the blood is controlled within narrow limits by many hormones, the most important of which are produced by the pancreas. The mean normal blood glucose level in humans is about 4 mM (4 mmol/L or 72 mg/dL, i.e. milligrams/deciliter); however, this level fluctuates throughout the day 16, 17,18,19,20 . In order to check the applicability of peroxidase, the enzymatic determination of a serum metabolite such as glucose was performed. In these reactions the enzyme must be present in saturating amounts in order to be sure that H2O2 produced in the test is converted into a colored substance 4 . The optimal concentration of peroxidase, which gave a linear response with time, was 100 units/100 ml reagents. The present study shows that, in spite of peroxidase have not been completely purified, it gave good stability in glucose kit for one year as demonstrated in (Table 1 and Fig.3). The stability of the prepared kits was in agreement with those of commercial kits. They were stable up to one year at 37 ?C when be tested corresponding to the reference range of glucose; Normal: 74-102 mg/dl and Pathogenic: 235-325mg/dl. CONCLUSION In general, these results will promote using the turnip roots as alternative source of peroxidase in clinical diagnostic kits in which H2O2 is generated and then determined using peroxidase as glucose, uric acid, triglycerides and cholesterol or in immunoassay reagents as Western blot, Dot Blot and ELISA 4, 21,22,23 .

ACKNOWLEDGMENT
Authors acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. The authors are also grateful to authors /editors/publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed. Authors offer thanks to the Holding Company of Biological Products and Vaccines (Vacsera), Egypt, who’s funded this project.

 

References:

1. Conroy JM, Borzelleca DC, Mcdonell LA. Homology of Plant Peroxidases. Plant Physiol. 1982; 69: 28-31.

2. Agostini E, Milrad DE, Forchetti S.R and Tigier H.A. Characterization and application of an anionic peroxidase isoenzyme from Brassica napus roots. Plant peroxidase newsletter. 1999; 13: 153-159.

3. Toyama M, Marangoni MS, Pastore GM. Extraction, Purification and biochemical characterization of a peroxidase from Copaifera langsdorffii leaves. Quim Nova. 2007; 30(5):1067-1071.

4. Agostini E, Herna J, Arnao MB, Milrad SR, Tigier HR, Acosta M. A peroxidase isoenzyme secreted by turnip (Brassica napus) hairy-root cultures: inactivation by hydrogen peroxide and application in diagnostic kits. Biotechnol. Appl Biochem 2002; 35:1–7

5. Hamid, M , Ur-Rehman K. Potential applications of peroxidases. Food Chemistry. 2009; 115( 4):1177–1186

6. Rodriguez-Cabrera NA, Regalado C, GarciaAlmendarez BE. Cloning, heterologous expression and properties of a recombinant active turnip peroxidase. J Agric Food Chem. 2011; 59(13):7120-6.

7. Rudrappa T1., Lakshmanan VA., Kaunain RA., Singara MA and Neelwarne B. Purification and characterization of an intracellular peroxidase from genetically transformed roots of red beet (Beta vulgaris L.). Food Chemistry. 2007; 105(3): 1312- 1320

8. Zamorano L.S, Cuadrado N.H, Galende P.P, Roig M.G, Shnyrov V.L. Steady-state kinetics of Roystonea regia palm tree peroxidase. Journal of Biophysical Chemistry. 2012; 3(1): 16-28.

9. Bergmeyer H.U. Methods of Enzymatic Analysis 1, Academic Press, New York. 2nd Edition. 1974; 495 10. Bradford, M. A rapid and sensitive for the quantitative of microgram quantities of protein utilizing the principle of protein- dye binding. Analytical biochemistry. 1976; 72:248-254.

11. Laemli, U.K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970; 227:680- 685.

12. GLUCOSE–Liquizyme GOD-PAP (Single Reagent). Egyptian Company for Biotechnology (Spectrum) (S.A.E). 2007. www.spectrum-diagnostics.com

13. Singh N, Gade WN, Singh J. Purification of turnip peroxidase and its kinetic properties. Prep Biochem Biotechnol. 2002; 32(1):39-49.

14. Singh N , Singh J. A method for large scale purification of turnip peroxidase and its characterization. Prep Biochem Biotechnol. 2003; 33(2):125-35.

15. Dalal S, Gupta MN. Purification and characterization of a peroxidase isozyme from Indian turnip roots. J Agric Food Chem. 2010; 58(9):5545-52.

16. Weissman M, klien B. Evaluation, of glucose determination. In: untreated serum samples. Clin Chem. 1958; 4:420-422 17. Trinder P. Determination of Glucose in blood using Glucose Oxidase with an alternative Oxygen Acceptor. Ann Clin Biochem.1969;6:24-25

18. Howanitz PJ, Howanitz JH. Carbohydrates. In: Henry JB,ed. Clinical diagnosis and mana-Gement by laboratory methods. 17th ed Philadelphia: WB Saunders. 1984; 165-179.

19. Caraway WT, Watts NB. Carbohydrates. In: Tietz NW, ed. Fundamentals of Clinical Chemistry. 3ry ed. Philadephia WB saunders. 1987; 422-447.

20. Tietz NW. Clinical guide to laboratory tests. 3rd ed. Philadelphia: WB Saunders. 1995. 268-273.

21. Koonakosit R. Semiquantitative determination of urinary glucose: comparison of home-made strip and routine tests. J Med Assoc Thai. 2000; 83(1):152-60.

22. Regalado C, Blanca E, Almendárez G, Miguel A , Vázquez D. Biotechnological applications of peroxidases. Phytochemistry Reviews. 2004; 3 (1-2): 243-256.

23. Cao J, Chen Q, Zhang H, Qi P, Liu C, Yang X, Wang N, Qian B, Wang J, Jiang S, Yang H, Sun S , Pan W. Novel evolved immunoglobulin (Ig)-binding molecules enhance the detection of IgM against hepatitis C virus. PLoS One. 2011; 6(4):18477.

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A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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Disclaimer: International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal.



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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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