Peroxidase(s) in Environment Protection

Bansal, Neelam; Kanwar, Shamsher S.

doi:https://doi.org/10.1155/2013/714639

The Scientific World Journal

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Abstract Introduction Applications Conclusion Acknowledgments References Copyright Related Articles

Review Article | Open Access

Volume 2013 | Article ID 714639 | https://doi.org/10.1155/2013/714639

Peroxidase(s) in Environment Protection

Neelam Bansal¹and Shamsher S. Kanwar¹

Academic Editor: S. Menoret, P. Poltronieri

Received30 Aug 2013

Accepted05 Oct 2013

Published24 Dec 2013

Abstract

Industrial discharges of untreated effluents into water bodies and emissions into air have deteriorated the quality of water and air, respectively. The huge amount of pollutants derived from industrial activities represents a threat for the environment and ecologic equilibrium. Phenols and halogenated phenols, polycyclic aromatic hydrocarbons (PAH), endocrine disruptive chemicals (EDC), pesticides, dioxins, polychlorinated biphenyls (PCB), industrial dyes, and other xenobiotics are among the most important pollutants. Peroxidases are enzymes that are able to transform a variety of compounds following a free radical mechanism, thereby yielding oxidized or polymerized products. The peroxidase transformation of these pollutants is accompanied by a reduction in their toxicity, due to loss of biological activity, reduction in the bioavailability, or the removal from aqueous phase, especially when the pollutant is found in water. The review describes the sources of peroxidases, the reactions catalyzed by them, and their applications in the management of pollutants in the environment.

1. Introduction

Two unpredicted challenges for human being are energy and environment. Functioning of society as a whole and its future progress are dependent on the availability of new and renewable sources of energy and on the capacity to change polluting productive processes for new environment friendly processes. Together, these developments have led to a growing awareness of the central importance for the environmental sciences as humankind attempts to transition to a more sustainable relationship with the Earth and its natural resources [1]. Peroxidases have potential to decrease environmental pollution by bioremediation of waste water containing phenols, cresols, and chlorinated phenols, for biopulping and decolourization of synthetic textile azo-dyes. Peroxidases (EC 1.11.1.7) are oxidoreductases that catalyse the reduction of peroxides, such as hydrogen peroxide (H₂O₂) and the oxidation of a variety of organic and inorganic compounds [2, 3]. Specifically, peroxidase activity involves donating electrons that bind to other substrates such as ferricyanides and ascorbate, in order to break them into harmless components.

Peroxidases have potential for bioremediation of waste water contaminated with phenols, cresols, and chlorinated phenols, for biopulping [4] biobleaching in paper industry, textile-dye degradation, and removal of peroxide from materials such as food stuffs and industrial wastes. Process water from textile mills often features a strong coloration due to presence of rhodamine dyes which are resistant to conventional bleaching treatment and can be degraded by peroxidase [5]. The unique ability of white rot fungi to degrade lignin is largely attributable to the nonspecific free radical mediated oxidizing reactions carried out by their extracellular peroxidases [6]. Peroxidase oxidizes dimethoxybenzene, lignin dimers, phenols, amines, dyes, and aromatic alcohols in the absence of Mn(II); peroxidase oxidizes phenolic and nonphenolic substrates. Yet another peroxidase, designated dye-decolorizing peroxidase from Agaricus type fungi, was reported to catalyze the oxidation of dyes and phenolic compounds [7]. Peroxidases from different sources are relatively nonspecific and provide white rot fungi the unique ability to degrade abroad array of environmental pollutants such as dioxins, polychlorinated biphenyls, petroleum hydrocarbons, munitions wastes (such as trinitrotoluene), industrial dye effluents, herbicides, and pesticides [8].

2. Sources of Peroxidase

Peroxidases (EC 1.11.1.7) are widely distributed in nature. These enzymes are produced by a variety of sources including plants, animals, and microbes. Peroxidases produced from microbial sources such as bacteria (Bacillus sphaericus, Bacillus subtilis, Pseudomonas sp., Citrobacter sp.), Cyanobacteria (Anabaena sp.), fungi (Candida krusei, Coprinopsis cinerea, Phanerochaete chrysosporium), actinomycetes (Streptomyces sp., Thermobifida fusca), and yeast are used in decomposition of pollutants, production of animal feedstock, and raw materials for the chemical, agricultural, paper industries, textile dye degradation, paper-pulp industry for lignin degradation, dye decolorization, sewage treatment, and also as biosensors. Many plant sources for peroxidases production have been reported such as horseradish, papaya (Carica papaya), banana (Musa paradisiacal), and bare (Acorus calamus). Peroxidase obtained from horseradish (HRP) is extensively used in diagnostic kits, in ELISA for labeling an antibody, synthesis of various aromatic chemicals, and removal of peroxides from materials such as foodstuff and industrial wastes (Figure 1).

3. Characteristics of Peroxidase(s)

Peroxidases are oxidoreductases that catalyse a variety of reactions such as reduction of peroxides such as hydrogen peroxide and oxidation of a variety of organic and inorganic compounds. These are heme proteins and contain iron (III) protoporphyrin IX as the prosthetic group. They have a molecular weight ranging from 30 to 150 kDa. The term peroxidase represents a group of specific enzymes, such as NADH peroxidase (EC 1.11.1.1), glutathione peroxidase (EC 1.11.1.9), and iodine peroxidase (EC 1.11.1.8), as well as a variety of nonspecific enzymes that are simply known as peroxidases.

4. Applications and Peroxidase Biocatalysis in Management of Environmental Pollutants

4.1. Decolorization of Synthetic Dyes

Dye wastes represent one of the most problematic groups of pollutants considered as xenobiotics that are not easily biodegradable [9]. These dyes are mostly used in textile dyeing, paper printing, colour photography, and as additive in petroleum products. When these synthetic dyes are discharged into industrial effluents they cause environmental pollution. Textile industries play a vital role in the economic increases in India. Water is one of the major products of nature used enormously by human beings, and it is not unnatural that any growing community generates enormous waste water or sewage [10]. To achieve the biodegradation of environmentally hazardous compounds, white rot fungi appear as a valuable alternative. The capability of oxidation is based on the ability of white rot fungi to produce oxidative enzymes such as laccase, manganese peroxidase, and lignin peroxidase [11]. These oxidases and peroxidases have been reported as excellent oxidant agents to degrade dyes [12].

Several bacterial peroxidases have been used for decolorization of synthetic textile dyes. Removal of chromate Cr (VI) and azo dye Acid Orange 7 (AO7) using Brevibacterium casei under nutrient-limiting conditions has been studied. AO7 was used as an electron donor by the reduction enzyme of Brevibacterium casei for the reduction of Cr (VI). The reduced chromate Cr (III) complexed with the oxidized AO7 formed a purple intermediate [13]. Decolorization of different azo dyes by Phanerochaete chrysosporium RP 78 under optimized conditions was studied [14] by reaction mechanism via azo dye. Peroxidase was produced under aerobic conditions as a secondary metabolite in the stationary phase. Bacillus sp. VUS isolated from textile effluent contaminated soil showed capability for degrading a variety of dyes [15]. The production of ligninolytic peroxidases directly oxidizing aromatic compounds has been described in fungi [16]. Other peroxidases were detected in microorganisms responsible for the biodegradation of industrial dyes together with lignin peroxidase [17]. An edible macroscopic fungi Pleurotus ostreatus produced an extracellular peroxidase that can decolorize remazol brilliant blue and other structurally different groups including triarylmethane, heterocyclic azo, and polymeric dyes. Bromophenol blue was decolorized best (98%), while methylene blue and toluidine blue O were least decolorized 10% [18]. HRP was found to degrade industrially important azo dyes such as remazol blue. This dye contains at least one aromatic group in its structure making it a possible substrate of HRP [19]. The dyeing and bleaching unit’s contaminants seeping into the ground have polluted the ground water rendering it unsuitable for consumption (Table 1).

4.2. Bioremediation of Waste Water: Removal of Phenolic Contaminants and Related Compounds

Industrial pollution has been a major factor causing the degradation of the environment around us, affecting the water we use; its quality and human health is directly related issues. Improved quality and increased quantity of water would bring forth health benefits. Safe water eliminates the infective agents associated with water borne diseases; availability of greater quantity of water can improve health by allowing improved personal hygiene. Water pollution caused industrial waste products to release into lakes, rivers, and other water bodies that make marine life no longer hospitable. Peroxidases have been applied to the bioremediation of waste waters contaminated with phenols, cresols, and chlorinated phenols [2, 9]. Aromatic compounds including phenols and aromatic amines constitute one of the major classes of pollutants. They are found in the waste waters of a wide variety of industries, including coal conversion, petroleum refining, resins and plastics, wood preservation, metal coating, dyes and other chemicals, textiles, mining and dressing, and pulp and paper industries [34]. Phenols and halogenated phenols present in textile industries processed water are known to be toxic and also some of them are hazardous carcinogens that can accumulate in the food chain [5].

Peroxidases comprise an important class of enzymes able to catalyze the oxidative coupling reactions of a broad range of phenolic compounds [35]. Lignin peroxidase from Phanerochaete chrysosporium, HRP, myeloperoxidase, lactoperoxidase, microperoxidase-8, a versatile peroxidase from Bjerkandera adusta, and chloroperoxidase from Caldariomyces fumago [36] were able to transform pentachlorophenol totetrachloro-1,4-benzoquinone by an oxidative dehalogenation in the presence of H₂O₂. An extracellular manganese peroxidase produced by P. chrysosporium, P. sordida, C. subvermispora, P. radiata, D. squalens, and P. rivulosu. Two electron oxidation of that extracellular peroxidase by H₂O₂ yields Compound I which undergoes two consecutive one-electron reduction steps by oxidizing Mn²⁺ into Mn³⁺ that in turn oxidizes phenolic compounds [37]. Many toxic aromatic and aliphatic compounds occur in waste water of a number of industries. Among these, phenol is the most common aromatic pollutant and is also found in contaminated drinking water. Phenol can be toxic when present at an elevated level and is known to be carcinogenic. It has an effect on health even at low concentration. A laboratory phenol was treated with turnip root enzyme (peroxidase) extract in the presence of H₂O₂ as an oxidant to form corresponding free radicals. Free radicals polymerize to form substances that are less soluble in water. The precipitates were removed by centrifugation and residual phenol was estimated [38]. The results showed that turnip root enzyme extract degraded phenol more efficiently. Another versatile peroxidase produced by P. eryngii and P. ostreatus oxidized Mn²⁺ into Mn³⁺ similar to the action of MnP, and also high redox potential aromatic compounds, as LiP does, had broad specificity and oxidized nonphenolic compounds [39].

4.2.1. Mechanism of HRP-H₂O₂-Phenol Reaction

Horseradish peroxidase undergoes a cyclic reaction when reacting with phenolic substrates. This sequence is summarized in the following reactions: The enzyme starts in its native form (E) and is oxidized by H₂O₂ to form an active intermediate compound known as compound 1 (Ei). Compound 1 oxidizes one molecule of phenol (PhOH) to form a phenol free radical (PhO) and become compound II (Eii). Compound II oxidizes a second phenol molecule to produce another phenol free radical and complete the cycle by returning to its native form E. The free radicals polymerize and form insoluble compounds which precipitate from solution [40]. The polymerization reaction is illustrated in Yet another peroxidase, designated dye-decolorizing peroxidase (EC 1 : 1 : 1 : ) from Agaricus type fungi, was reported to catalyze the oxidation of dyes and phenolic compounds [7] (Figure 2).

4.3. Removal of Endocrine Disruptive Chemicals (EDCs)

Several classes of oxidative enzymes have shown promise for efficient removal of EDCs that are resistant to conventional waste water treatments. Although the kinetics of reactions between individual EDCs and selected oxidative enzymes such as HRP are well documented in the literature, there has been little investigation of reactions with EDC mixtures [41]. EDCs are a group of compounds that due to their chemical structure are able to act as agonists or antagonists of hormones. They can disturb the synthesis, secretion, transport, binding, action, and elimination of the endogenous hormones, which are responsible for maintaining homeostasis, reproduction, development, and integrity in living organisms and their progeny [42]. They are widely dispersed in the environment but are mainly found in waste water effluents. Several works reported the EDC oxidation by manganese peroxidase. Using 10 U/mL of manganese peroxidase from Pleurotus ostreatus, 0.4 mM bisphenol was eliminated in 1 h [43]. Peroxidases are also helpful in removal or degradation of other potent environmental pollutants such as chloroanilines and polycyclic aromatic hydrocarbons [44].

4.4. Degradation of Polychlorinated Biphenyls (PAHs) Pesticides

Pesticides include a broad range of substances most commonly used to control insects, weeds, and fungi. Pesticide exposure in human is associated with chronic health problems or health symptoms such as respiratory problems, memory disorders, dermatologic conditions, cancer, depression, neurologic deficits, miscarriages, and birth defects [45]. Biological decomposition of pesticides is the most important and effective way to remove these compounds from the environment. Microorganisms have the ability to interact, both chemically and physically, with substances leading to structural changes or complete degradation of the target molecule [46].

Peroxidases extracted from some fungal species have great potential to transform several pesticides into harmless form(s). Transformation of organophosphorus pesticides by white rot fungi has been studied [47], and transformation of several organophosphorus pesticides by the chloroperoxidase from Caldariomyces fumago has been reported. PAHs are composed of two or more fused aromatic rings and are components of crude oil, creosote, and coal [48]. Most of the contamination by PAHs had originated from the extensive use of fossil fuels as energy sources. Peroxidases and phenol oxidases can act on specific PAH’s by transforming them to less toxic or products easier to degrade. PAHs are oxidized by peroxidases such as lignin peroxidase [49] and manganese peroxidase [50]. In spite of their versatility and potential use in environmental processes, peroxidases are not applied at large scale yet. Diverse challenges, such as stability, redox potential, and the production of large amounts, should be addressed in order to apply peroxidases in the pollutant transformation [51]. Peroxidases extracted from some fungal species have great potential to transform several pesticides into harmless form(s). In spite of their versatility and potential use in environmental processes, peroxidases are not applied at large scale yet. Diverse challenges, such as stability, redox potential, and the production of large amounts, should be addressed in order to apply peroxidases in the pollutant transformation.

4.5. Degradation of Chlorinated Alkanes and Alkenes

Contamination of soils and aquifers by the aliphatic halocarbons trichloroethylene (TCE) and perchloroethylene (PCE) widely used as degreasing solvents is a serious environmental pollution problem. TCE is subject to in vitro reductive dehalogenation catalyzed by LiP of P. chrysosporium in the presence of tertiary alcohol, H₂O₂, and EDTA (or oxalate) leading to the production of the corresponding reduced chlorinated radicals [52]. One strain of bacterium IM-4 capable of degrading imazethapyr (IMZT) was isolated from the IMZT-contaminated soil. This strain also showed the capability to degrade other imidazolinone herbicides such as imazapyr, imazapic, and imazamox [53]. Extracellular hydroxyl radicals produced by T. versicolor, via quinone redox cycling, were also shown to catalyze degradation of PCE and TCE [1]. TCE is mineralized by P. chrysosporium cultures grown aerobically. These investigators proposed that TCE is subject to in vitro reductive dehalogenation catalyzed by LiP of P. chrysosporium in the presence of tertiary alcohol, H₂O₂, and EDTA (or oxalate) leading to the production of the corresponding reduced chlorinated radicals [8].

4.6. Degradation of Phenoxy Alkanoic and Triazineherbicides

The most commonly used broad leaf herbicides around the world are 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyaceticacid (2,4,5-T). 2,4-D and perhaps 2,4,5-T are a component of Agent Orange that was widely used as a defoliant. 2,4-D is quite susceptible to bacterial degradation and generally does not persist for long in the environment. On other hand 2,4,5-T is relatively more resistant to microbial degradation and tends to persist in the environment. It has been blamed for serious illnesses in many veterans of Vietnam War, where they got exposed to Agent Orange that was used as a defoliant. These were also reported to be mutagenic agents and thus very toxic to humans. Ligninolytic peroxidases of P. chrysosporium and Dichomitus qualens were involved in the degradation of chlorinated phenolic intermediates of 2,4-D and 2,4,5-T. These results were based on the increased degradation of ring-labeled and side chain-labeled 2,4,5-T and 2,4-D by D. Squalens on addition of Mn²⁺ (a known inducer of MnP) to the medium and on increased degradation by P. chrysosporium in nitrogen-limited medium (in which production of both LiP and MnP is induced). Atrazine is a commonly used triazine herbicide and is degraded by a number of white rot fungi produced laccases and peroxidase [54].

4.7. Degradation of Chlorinated Dioxins

Polychlorinated dibenzodioxins (PCDDs) are a group of highly toxic environmental pollutants that are confirmed human carcinogens and tend to bioaccumulate in humans and animals due to their lipophilic properties. Polychlorinated dibenzodioxins (PCDD) and polychlorinated dibenzofurans (PCDF) have been shown to be degraded by several species of white rot fungi [55] suggesting the possible involvement of LiP and MnP. A fungus P. sordida produced MnP but no LiP; and crude MnP showed degradation of the dioxins.

4.8. Degradation of Chlorinated Insecticides

Lindane (c isomer of hexachlorocyclohexane) was a widely used pesticide in the past, and an estimated 600,000 tons of lindane were produced globally between the year 1950 and 2000. There is a global ban on the use of lindane now because of its environmental persistence as a pollutant. P. chrysosporium cultured under ligninolytic conditions was reported to partially mineralize lindane in liquid cultures and in a corncob-amended soils inoculated with P. chrysosporium [56] but lindane degradation was not observed in vitro using purified LiP and MnP from P. chrysosporium [57]. DDT (1,1,1-trichloro-2,2-bis [4-chlorophenyl] ethane), the first of the chlorinated organic insecticides, was used quite heavily after World War II. High levels of DDT found in agricultural soils are of deep concern, because they present serious threats to food security and human health. The white rot fungi P. chrysosporium, P. ostreatus, T. versicolor, and Phellinus weirii have been shown to mineralize DDT [58].

4.9. Peroxidase as Biosensors

Biosensors have been defined as analytical devices which tightly combine biorecognition elements with physical transducers for detection of the target compound. Several examples of biosensors developed for relevant environmental pollutants. Biosensors can be useful, for example, for the continuous monitoring of a contaminated area [59]. They may also present advantageous analytical features, such as high specificity and sensitivity (inherent in the particular biological recognition bioassay. H₂O₂ is considered the mediator of the biochemistry of cellular pathology and maybe involved in the etiology of aging and progressive neurodegenerative diseases such as Parkinson’s disease. Due to its crucial role in neurochemistry, determination of the concentration of H₂O₂ has been a considerable interesting research field. Electrochemical methods based on peroxidase biosensors have proved to be significantly advantageous to the biosciences due to their direct real-time measurements and capability for practical applications [60]. A novel third generation biosensor for hydrogen peroxide was constructed by cross-linking HRP onto an electrode modified with multiwall carbon nanotubes [61]. At the same time, biosensors offer the possibility of determining not only specific chemicals but also their biological effects, such as toxicity, cytotoxicity, genotoxicity, or endocrine disrupting effects, that is, relevant information that in some occasions is more meaningful than the chemical composition. Enzymatic biosensors are based on the selective inhibition of specific enzymes by different classes of compounds, with the decrease in activity of the immobilized enzyme in the presence of the target analyte as the parameter that is frequently used for quantification.

A novel myoglobin-based electrochemical biosensor based on a nanocomposite prepared from multiwalled carbon nanotubes that were coated with ceria nanoparticles has been developed [62]. Another application of whole-cell biosensors is the determination of the biological oxygen demand (BOD). Pesticides (herbicides, fungicides, and insecticides) are widely used in the agriculture and industry around the world due to their high insecticidal activity. Biosensors are potentially useful as they detected pesticides quickly and have been active in the research area for some years. Another valuable HRP-based biosensor was developed in which polyvinyl pyrrolidone (PVP) nanofibers were spun with incorporation of the enzyme HRP. Scanning electron microscopy (SEM) of the spun nanofibers was used to confirm the non woven structure which had an average diameter of 155 ± 34 nm. The HRP containing fibers were tested for their change in activity following electrospinning and during storage. A colorimetric assay was used to characterize the activity of HRP by reaction with the nanofiber mats in a microtiter plate and monitoring the change in absorption over time [63]. Rapid and sensitive detection methods are of utmost importance for the identification of pathogens related to health and safety. Peroxidase used in development of a nucleic acid sequence-based lateral flow assay which achieves a low limit of detection using chemiluminescence and enzymatic signal amplification [64].

4.10. Use in Pulp-Paper Industries

The pulping byproducts (black liquor) and pulp mill waste water cause serious environmental problem due to its high pollution load. Solving the pulp and paper industries’ environmental problems is essential to maintaining the forest industry and accommodating the changing economic needs of forest communities [65]. Pulp manufacturing in pulp paper industries involve two main processes, that is, wood digestion and bleaching. In the process of wood digestion, wood chips are cooked in the solution of sodium hydroxide and sodium sulphate at elevated temperature and pressure to break chips into fiber mass. The chemical reaction with wood fibers dissolves all the depository materials which are hard to degrade, and these derivatives are washed away from the fiber during washing and dewatering process. Various extracts during washing include mainly lignins, cellulose, phenolics, resins, fatty acids, and tannins mixed together to make a dark black viscous alkaline waste known as black liquor. The alkaline effluent consists only in 10%–15% of total waste water but contributes in almost above 90%–95% of the total pollution load in terms of high pH, BOD, COD, and color which makes it significantly toxic to the environment [66]. Hence, the adequate treatment of black liquor prior to its discharge into environment is warranted. The biological methods for the treatment of black liquor involving the use of fungi, bacteria, algae, and enzymes as single step treatment or in combination with other physical and chemical methods seem to be more economical and ecofriendly [4]. Among biological methods tried so far, most of the literature is confined to a few genera of white rot fungi because of their nonspecific extracellular enzymatic system (LiP, MnP, and Laccase) involved in lignin biodegradation [67].

5. Conclusion

Importance of peroxidase in the detoxification of polluted environments relies on their capability to catalyse the reduction of peroxides, such as hydrogen peroxide and the oxidation of a variety of organic and inorganic compounds and the polymerization of toxic compounds or, by cross reaction, with other phenolics or with cosubstrates with toxic and harmless characteristics and generates polymeric products (dimmers, trimmers, hybrid oligomers), which will very likely accumulate in soil and/or in water systems. Peroxidases have potential for bioremediation of waste water contaminated with phenols, cresols, and other industrial effluents, for decolourization of textile dyes, removal of endocrine disruptive chemicals, degradation of pesticides, polychlorinated biphenyls, chlorinated alkanes and alkenes of soil, phenoxy alkanoic herbicides, triazine herbicides, chlorinated dioxins, and chlorinated insecticides. Peroxidases are also used as biosensors. Rapid progresses in the use of peroxidase for the degradation of pollutants have thrown more light on sustainable bioremediation strategies for polluting compounds and environmental protection by using different enzymes. Environmental protection is influenced by three interwoven factors: environmental legislation, ethics, and education. Each of these factors plays an important role in influencing national-level environmental decisions and personal-level environmental values and behaviors. For environmental protection to become a reality, it is important for societies and the nations to develop each of these areas that together will inform and drive environmental decisions.

Acknowledgments

This work has been funded by Council for Scientific and Industrial Research, New Delhi, under CSIR-NET Junior Research Fellowship awarded to one of the authors (NB). The authors are thankful to CSIR, New Delhi, and Department of Biotechnology, Himachal Pradesh University, Shimla.

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Copyright © 2013 Neelam Bansal and Shamsher S. Kanwar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Peroxidase(s) in Environment Protection

Abstract

1. Introduction

2. Sources of Peroxidase

3. Characteristics of Peroxidase(s)

4. Applications and Peroxidase Biocatalysis in Management of Environmental Pollutants

4.1. Decolorization of Synthetic Dyes

4.2. Bioremediation of Waste Water: Removal of Phenolic Contaminants and Related Compounds

4.2.1. Mechanism of HRP-H2O2-Phenol Reaction

4.3. Removal of Endocrine Disruptive Chemicals (EDCs)

4.4. Degradation of Polychlorinated Biphenyls (PAHs) Pesticides

4.5. Degradation of Chlorinated Alkanes and Alkenes

4.6. Degradation of Phenoxy Alkanoic and Triazineherbicides

4.7. Degradation of Chlorinated Dioxins

4.8. Degradation of Chlorinated Insecticides

4.9. Peroxidase as Biosensors

4.10. Use in Pulp-Paper Industries

5. Conclusion

Acknowledgments

References

Copyright

4.2.1. Mechanism of HRP-H₂O₂-Phenol Reaction