This content only applies to transition applications that were received before 1 July 2014. The content will be relevant for these applications until 30 June 2015. For all other applications, including new applications, please visit www.apvma.gov.au AUSTRALIAN PESTICIDES AND VETERINARY MEDICINES AUTHORITY GUIDELINES FOR THE REGISTRATION OF ENZYME BASED PRODUCTS USED IN STOCK FEEDS Release date: 8 June 2001 Guideline Number: 10 APVMA PO Box E240 Kingston ACT 2604 Australia Phone: +61 (0)2 6272 3744 Fax: +61 (0)2 6272 5249 Email: [email protected] http://www.apvmagov.au Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds INTRODUCTION In an effort to achieve greater consistency in the review procedures for animal feed enzymes, this preamble sets out some relevant issues. An outline is also given of the information which must be presented for evaluation of enzymes used in animal feeds. What are enzymes? Enzymes are natural substances produced by all living cells. All living organisms depend on enzymes to carry out energy-releasing reactions, to synthesize the building blocks of cells and to conduct virtually all other physiological processes. Enzymes are high-molecular weight proteins composed of amino acids. They may also contain non-protein parts such as carbohydrates, lipids, phosphate groups and metals. The enzymes that are used in human and animal feeds or in the food processing industry may be of plant, animal or microbial origin. What do enzymes do? Enzymes are able to accelerate the rate of specific chemical reactions but do not themselves undergo any chemical change. Enzymes are specific in their catalytic properties Firstly, each enzyme acts on a restricted number of compounds (substrates). In many cases it is active on only one compound. Secondly, an enzyme when acting on its substrate, catalyses only one specific type of reaction, for instance, enzymes can break down complex molecules into smaller units, catalyse structural changes within one molecule or join the substrate molecules to other specific molecules. Some enzymes are not capable of acting alone but require the presence of a lowmolecular weight component called a co-factor. The most common co-factors are metal-ions and nucleotides. The specificity and catalytic activity of a particular enzyme is due to the molecular structure and three-dimensional shape of the enzyme molecule. The sequence of the different amino acids makes up the primary structure of the enzyme molecule. The characterisation and nomenclature of enzymes are based on the specific substrate and the type of reaction catalysed, and not on their molecular composition. Page 2 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds Production of microbial enzymes For the microbial sourced enzymes pure cultures of selected strains of microorganisms are used to produce specific enzymes. During fermentation, these microorganisms are grown on natural substances such as starch and molasses. The use of pure cultures of selected strains excludes the effects of competing micro-organisms and ensures consistency in the performance of the process and the quality of the product. In the recovery process the enzymes are separated from the fermentation broth. However the final enzyme preparation may still contain small amounts of fermentation residues. Standardisation of the main enzymatic activity must then be achieved by the addition of appropriate food grade materials. Safety Considerations The safety of animal feed enzymes can be evaluated at three different levels: • • • potential risk to the environment in which the micro-organisms and/or their products are released, possible health hazard for the staff working with the product, safety of use on the target animals. Since enzymes are readily biodegradable, their environmental release should not cause any environmental problems. Furthermore the containment of the production organism itself is controlled by the physical nature of the fermentation system and by the recovery plant meeting a high standard. Biological containment is ensured by the production organisms having been adapted to grow only under defined fermentation conditions. Some occupational health risks may arise from the handling of enzyme preparations. Enzyme dusts may lead to respiratory allergies in susceptible individuals while certain proteases may cause irritation to the skin, eyes or mucous membranes. These risks can be avoided by protective measures and the use of specific formulations of the enzyme preparations. To ensure safety to target animals the microbial enzymes must be obtained from nonpathogenic and non-toxicogenic micro-organisms grown on raw materials which do not contain components that might be hazardous to human health. Target animal safety must also be demonstrated in animal feeding trials. Whenever a new strain with improved enzyme production capabilities is developed or when production conditions are altered the possible impact on safety must be carefully considered. Each new strain must be checked for its key taxonomic characteristics. If the production strain contains recombinant DNA consultation with and approval by the Office of Gene Technology Regulator (OGTR) is an additional requirement. Page 3 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds The characteristics and safety record of each of the strains contributing genetic information to the production strain must be carefully assessed and appropriate safety tests performed. The safety of the final enzyme preparations is ensured by compliance with "Good Manufacturing Practice" (GMP). The purity of the preparations is checked for the level of contaminating micro-organisms and for absence of heavy metals, mycotoxins and antibacterial activity. Refer Section 2.3 and Appendix 3. Finally, since enzymes are always used at very low dosage levels in animal feeds and will be digested in the animals gut, no tissue residues will result. It can therefore be concluded that the enzymes do not in themselves present any hazard to human health. Consequently an Acceptable Daily Intake (ADI) for enzymes is generally not considered necessary. SUMMARY OF REGULATORY REQUIREMENTS The following information and documentation must be provided: 1. IDENTITY OF END-USE PRODUCT 1.1 Trade name 1.2 Qualitative and Quantitative composition • • • • each principal active substance(s) other components including incidental enzyme(s) any impurities and undesirable substance(s) typical composition of the commercial enzyme preparation including the content of proteins, carbohydrates, fats, ash, water and diluents identity of stabilisers, preservatives and any other formulating agents; these substances should be compatible with the intended use of the enzyme preparation. 1.3 Name and address of manufacturer(s) of enzyme(s). 1.4 Name and address of manufacturer of final end use product(s). 1.5 Name and address of distributor/agent of final end use product(s). 2 IDENTITY AND BIOLOGICAL SOURCE OF COMPONENT ENZYMES 2.1 Enzyme production strain(s) The taxonomy of the micro-organism should be precisely defined and the literature reviewed for reports of use in human or animal food as well as any toxicogenicity and pathogenicity associated with the species. Page 4 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds The names of the micro-organisms are those recommended in Bergey's Manual of Determinative Bacteriology (8th edition Baltimore Press, 1974), "The Genus Aspergillus" (Raper and Fennel, Baltimore Press, 1965) and "The Yeasts: a taxonomic study" (Lodder and Kreger van Raj, Delft, 1970). Where new production strains are obtained by classical mutation-selection or genetic engineering methods, a description of the origin of the strain should be included. For recombinant DNA organisms, the donor organism, vector system, inserted gene as well as the host organism should be described. 2.2 Classification of the enzyme The main enzyme activity with corresponding EC, IUB and CAS numbers should be declared. The activity of the commercial enzyme preparation should be standardised and may be expressed in international or manufacturer's units. The names of the enzymes are those recommended in Enzyme Nomenclature, Recommendations of the Nomenclature Committee of the International Union of Biochemistry (Academic Press, 1984). 2.3 Specifications of the enzyme preparation Physical, chemical and microbial specifications including purity and potency of the enzyme product must be presented. The requirements correspond with those given by the FAO/WHO Joint Expert Committee for Food Additives (JECFA) and Food Chemicals Codex (FCC), including, where appropriate, the General Considerations and Specifications for Enzymes from Genetically Manipulated Organisms. . The following limits for contaminants have been set: • • • • • • • • • Arsenic Lead Heavy metals Mycotoxins (fungal enzymes only) Antibiotic activity Coliforms Escherichia coli Salmonella Total viable count not more than 3 ppm not more than 10 ppm not more than 40 ppm negative by test negative by test not more than 30 per gram negative in 25 gram negative in 25 gram not more than 500 000 per gram Analytical methods must be defined. The activity of each enzyme with regard to appropriate types of substrates, shall be expressed as µmole of product released per minute per gram of the chemically pure enzyme. Optimum pH, moisture, temperature (and other appropriate properties) must be stated. Page 5 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds If the active substance is a mixture of active components, all the components must be described separately with an indication of their proportion in the mixture. 2.4 Approved Enzymes The Australia and New Zealand Food Authority (ANZFA), JECFA and USFDA have developed lists of microbial enzymes and source micro-organisms that are "generally regarded as safe" (GRAS). Such lists are published from time to time. ANZFA have published a list of approved enzymes and approved source organisms in the Australian Food Standards Code. The list appended to this document is constructed from lists published by ANZFA and includes those enzymes and source organisms approved for use up to June 2001. (Refer to Appendix 1). For the most up-to-date list of enzymes please refer to the Australian Food Standards Code on the ANZFA website (http://www.anzfa.gov.au) Wherever ANZFA, JECFA or USFDA have approved a food enzyme that is to be used as an animal food additive a minimal technical review of that enzyme will be required by the APVMA. However for any enzyme that has not previously been evaluated a more extensive review will be required. This may involve separate evaluations by the Therapeutic Goods Administration (TGA), National Occupational Health and Safety Commission (NOHSC), Office of Gene Technology Regulator (OGTR) and Environment Australia (EA). Where enzymes or enzyme based foodstuffs are imported there will also be a requirement that the Australian Quarantine Inspection Service (AQIS) have separately approved the importation of biologically derived materials (Refer Section 8). 3. JUSTIFICATION FOR USE OF PRODUCT The main enzymatic effects should be described indicating the likely benefit to result from the use of the enzyme preparation when fed in conjunction with specific feed substrates. Such substrates must be relevant to Australian feeding practices. Where the preparation is a mixture of effective components a justification for inclusion of each component must be provided. Where any other effects are known, or could be reasonably anticipated, these should be identified and discussed. Other known uses of the active substance or the preparation (in human or animal foodstuffs, human or veterinary medicine, food processing industry etc.) should be stated. 4. DIRECTIONS FOR USE OF PRODUCT Page 6 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds The particular uses in animal nutrition (species or classes of animal, type of feeding stuffs, period of use, etc.) must be specified. See Section 7 for specific requirements relating to efficacy claims. The proposed dosage in premixes and feeding stuffs expressed in appropriate units of biological activity such as activity units per gram. 5. TECHNICAL CONSIDERATIONS 5.1 Stability of product • • • effects of physical and chemical agents during production during the preparation of premixes and feeding stuffs within the end-use product packaging during storage. 5.2 Manufacturing processes and quality control • description of the process of manufacture and methods used to control the quality of the product during manufacture, identity and purity of the raw materials. Principles in the manufacturing procedure, including the operations applied in recovery, should also be described, control procedures ensuring pure culture conditions and chemical and micro biological purity should also be described, micro biological control procedures will be expected to conform to Good Manufacturing Practice. • • • 5.3 Assay methods for component enzymes Analytical methods for the determination of each enzyme present in premixes and final feed stuffs must be provided. Literature references may suffice. 6. TARGET ANIMAL SAFETY AND OCCUPATIONAL HEALTH • Where the component enzyme(s) have not been approved by ANZFA and/or JECFA and/or USFDA evidence of non-toxicogenicity of the enzyme preparations must be provided by extensive animal feeding trials. • Evidence of the non-pathogenicity of the production strain should be provided either be literature search or by actual experiments. • Recommendations concerning potential hazards and protection from occupational exposure during manufacture and handling. • The information required for the safety evaluation of immobilised enzyme preparations will not differ substantially from the above, except that a detailed description of the immobilisation system will be essential. Here tests for physical and chemical stability of the carrier, immobilisation agent and the Page 7 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds enzyme will be the key to the safety assessment. For systems where no leakage of carrier, immobilisation agent or enzyme can be demonstrated in validated assays, toxicological tests will not be necessary. 7. EFFICACY CONSIDERATIONS A two tiered structure of clearance/registration is envisaged. (a) Where non-specific or generic claims are made Such claims shall be restricted to "to increase the digestibility of certain feeds [e.g. barley/oats/wheat based diets] fed to specific animals [e.g. pigs/poultry including, where relevant, specific classes of those animals]". The types of diets must be relevant to Australian conditions and evidence provided from local and/or overseas trials that "increased digestibility" of these diets will result from the use of that particular enzyme(s). In this situation the information required relates only to the identity and specifications of the ingredient(s) and end use product as specified above i.e. identity, purity and potency and freedom from extraneous organisms, antibiotic activity or mycotoxins and heavy metal contaminants. No Australian efficacy data will be required here. (b) Where specific efficacy claims are made Such claims might include improved Feed Conversion Efficiency (FCE) or specific productivity gains in target animals. Where such claims are made, detailed efficacy studies, in support of those claims, must be provided. A significant component of Australian field trials is a requirement. It is however recognised that overseas data might comprise the bulk of the data submitted. 8. APPROVAL TO IMPORT BIOLOGICALLY ACTIVE SUBSTANCES Where the final end-use product or any component enzymes are imported it will be an absolute requirement that the applicant holds a current Australian Quarantine Inspection Service (AQIS) import permit. A copy of the AQIS certificate should be provided at the time of any Application for Clearance by the APVMA. Implicit in the issue of the AQIS certificate will be that the product conforms to the above specifications in terms of identity, purity and potency and that the products are free from extraneous organisms, antibiotic activity or mycotoxin contaminants. It is considered that the evidence provided and accepted by AQIS, at the time of their issuing an importation permit, shall be acceptable to the APVMA. Page 8 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds 9. INTERIM OFFICE OF GENE TECHNOLOGY (IGOT) APPROVAL If the production strain contains recombinant DNA, a separate application to the IOGT is a requirement. In addition, the donor organism, vector system, inserted gene as well as the host organism should be described. 10. OTHER APPROVALS Whenever it is proposed that a ANZFA-, JECFA- or USFDA- approved food enzyme is to be used as an animal feed enzyme minimal technical review by the APVMA will be required. However for any new enzyme that has not previously been evaluated by ANZFA and/or APVMA will require a more extensive review. This may involve separate evaluations by the Therapeutic Goods Administration (TGA), the Office of the Gene Technology Regulator (OGTR), Environment Australia (EA) and National Occupational Health and Safety Commission (NOHSC). Page 9 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds APPENDIX 1 Enzymes approved for use by ANZFA as Food Processing Aids – for the most up-to-date list of enzymes approved for use by ANZFA please see the Food Standards Code available from the ANZFA website (http://www.anzfa.gov.au) GROUP 1 - Animal Origin Enzyme Source α-Amylase (EC 3.2.1.1) Porcine pancreas Lipase (EC 3.1.1.3) Bovine stomach; Salivary glands or forestomach of calf, kid or lamb; hog or bovine pancreas Pepsin (EC 3.4.23.1) Bovine stomach; Hog stomach Phospholipase A2 (EC 3.1.1.4) Porcine pancreas Rennet (crude rennin) (EC 3.4.23.4) Bovine, calf, goat, kid, sheep or lamb stomach Trypsin (EC 3.4.21.4) Porcine or bovine pancreas GROUP 2 - Plant Origin Enzyme β-Amlyase (EC 3.2.1.2) Source Sweet potato (Ipomoea batatas) Bromelain (EC 3.4.22.4) Pineapple stem (Ananas Comosus) Malt carbohydrases (α-Amylase & β-Amylase combined (EC 3.2.1.1 & EC 3.2.1.2) Malted barley and barley Ficin (EC 3.4.22.3) Ficus sp Papain (EC 3.4.22.2) Carica papaya Page 10 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds GROUP 3 - Microbial Origin Enzyme Sources α- Acetolactate decarboxylase (EC 4.1.1.5) Bacillus subtilis1,3 Aminopeptidase (EC 3.4.11.1) Lactococcus lactis α-Amylase (EC 3.2.1.1) Aspergillus niger2 Aspergillus oryzae Bacillus licheniformis4 Bacillus subtilis3,4 β- Amylase (EC 3.2.1.2) Bacillus subtilis3 Arabinase (EC 3.2.1.99) Aspergillus niger2 Carboxyl proteinase (EC 3.4.23.6) Aspergillus melleus Aspergillus niger2 Aspergillus oryzae Bacillus lentus Bacillus subtilis Catalase (EC 1.11.1.6) Aspergillus niger2 Micrococcus lysodeikticus Cellulase multicomponent enzyme (EC 3.2.1.4) Aspergillus niger2 Trichoderma reesii6 Dextranase (EC 3.2.1.11) Chaetomium gracile Penicillium lilacinum Esterase (EC 3.1.1.1) Rhizomucor meihei5 Fructosyl transferase Arabino-furanosidase (EC 3.2.1.55) Aspergillus niger2 α-Galactosidase (EC 3.2.1.22) Aspergillus niger2 β-Glucanase (EC 3.2.1.6) Bacillus subtilis3 Aspergillus niger2 Penicillium emersonii Trichoderma harzianum Trichoderma reesii6 Aspergillus oryzae Disporotrichum dimorphosphorum Humicola insolens Glucoamylase (EC 3.2.1.3) Aspergillus niger2 Aspergillus oryzae Rhizopus niveus β-Glucosidase (EC 1.1.3.4) Aspergillus niger2 Page 11 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds Glucose isomerase (xylose isomerase) (EC 5.3.1.5) Bacillus coagulans Actinoplanes missouriensis Streptomyces murinus or Streptomyces rubiginosus Microbacterium arborecens Glucose oxidase (EC 1.1.3.4) Aspergillus niger2 Hemicellulase (Multicomponent enzyme identified by EC 3.2.1.78) Aspergillus niger2 Bacillus subtilis3 Trichoderma reesii6 Hemicellulase endo-1,3-β-D xylanase (EC3.2.1.32) Humicola insolens Hemicellulase endo-1,4-β-D xylanase (EC 3.2.1.8) Humicola insolens Trichoderma reesii6 Hesperidinase (EC 3.2.1.21/EC 3.2.1.43) Aspergillus niger2 Invertase (EC 3.2.1.25) Saccharomyces cerevisiae Saccharomyces cerevisiae var carlsbergensis Inulinase (EC 3.2.1.7) Aspergillus niger2 Lactase (β-Galactosidase) (EC 3.2.1.23) Saccharomyces fragilis7 Saccharomyces lactis8 Aspergillus niger2 Aspergillus oryzae Lipase (EC 3.1.1.3) Aspergillus niger2 Aspergillus oryzae9 Candida antarctica Rhizomucor miehei5 Rhizopus arrhizus Maltase (α-glucosidase) (EC 3.2.1.20) Aspergillus oryzae Metalloproteinase (EC 3.4.24.4) Aspergillus oryzae Bacillus subtilis3 Bacillus coagulans Naringinase (EC 3.2.1.21/EC 3.2.1.40) Aspergillus niger2 Pectinase (multicomponent enzyme) (EC 3.2.1.15) Aspergillus niger2 Aspergillus oryzae Trichoderma reesii6 Pentosanase (multicomponent enzyme) Humicola insolens Phytase (EC 3.1.3.8) Aspergillus niger2 Pullulanase Bacillus acidopullulyticus Page 12 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds (EC 3.2.1.41) Bacillus subtilis3 Klebsiella aerogenes Renin (chymosin) (EC 3.4.23.4) Rhizomucor meiheih Mucor pusillus Endothia parasitica Serine proteinase (EC 3.4.21.14) Bacillus licheniformis 1 α-Acetolactate decarboxylase is produced by a genetically manipulated strain of Bacillus subtilis containing the gene for α- Acetolactate decarboxylase isolated form Bacillus brevis and inserted by plasmid pUW235 2 The Apergillus niger group covers strains known under the names Aspergillus aculeatusa, A.awamori, A. ficum, A.foetidus, A.japonicus, A. phoenicis, A. saitor, and A. usamii. 3 Bacillus subtilis also known as Bacillus amayloliquefaciens 4 α- amylase may be produced from: (i) a genetically manipulated strain of Bacillus licheniformis containing the gene for α-amylase isolated from Bacillus stearothermophilus and inserted by plasmid pPL1117,or (ii) a genetically manipulated strain of Bacillus subtilis containing the gene for α-amylase isolated from Bacillus stearothermophilus and inserted by plasmid pDN1413. 5 Mucor miehi is the former name for Rhizomucor miehei 6 Trichoderma reesii is also known as Trichoderma longibrachiatum and Trichoderma viride 7 Saccharomyces fragilis is also known as Kluyveromyces fragilis 8 Saccharomyces lactis is also known as Kluyveromyces lactis 9 Lipase may be produced from a genetically manipulated strain of Aspergillus oryzae containing the gene for lipase isolated from Humicola lanuginosa and inserted by plasmids pBoe1960 and p3SR2 Page 13 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds APPENDIX 3 Good Manufacturing Practice in microbial food enzyme production General Good Manufacturing Practice in the microbial food enzyme industry ensures that enzyme preparations are produced, packed and handled in a hygienic way. All operations are designed to avoid contamination, formation of undesirable byproducts, deterioration and handling errors. The principles of GMP include systems of quality control and quality assurance, employee qualifications, maintenance standards for equipment, control of raw materials and product stability. The key issues in GMP are the microbiological control of the micro-organism selected for enzyme production, the control and monitoring systems ensuring pure culture and optimum enzyme productivity conditions during fermentation and control of the hygienic conditions throughout recovery and finishing of the enzyme preparations. Identity control and laboratory management of the production strain When a micro-organism has been selected for enzyme production, its taxonomic identity is checked. The master culture is kept as spores, on slants or as a dried preparation and stored at temperatures , sufficiently low to avoid degeneration and secure genetic stability. All vials or-slants for seed cultures are clearly labelled and in revival of the culture, strict aseptic techniques are applied. The seed culture is also checked for identity by morphological characterization and comparison with the taxonomic characteristics originally identified. Its purity is checked before transfer to the fermentation equipment by serial dilutions, plating and macroscopic and microscopic inspection for any foreign micro-organisms. Control of pure culture and operational parameters during fermentation Prior to fermentation the growth medium, consisting of a mixture of food or feed grade quality substances, is sterilized and, in the case of submerged fermentation’s, it is checked for sterility. Contamination during fermentation is prevented by the use of a large inoculum, carefully controlled optimum growth conditions for the production strain, overpressure in fermentation vessel, appropriate foam control in submerged fermentation and the use of sterile air. The culture liquid from submerged fermentation is sampled at regular intervals throughout processing and inspected by microscopy. To ensure sterility, incubated plates are checked for the presence of foreign micro-organisms. In semi-solid surface fermentation, sterility control is restricted to visual inspection. If a significant contamination develops, the batch is rejected from further food grade processing. Enzyme activity and operational parameters like temperature, pH and oxygen content are monitored during fermentation and kept within predetermined. ranges based on experience. Deviations from these ranges may indicate a contamination before it can be detected in microbial assays Page 14 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds Hygienic control during enzyme recovery GMP will ensure that contamination of the product during recovery is minimized. Hygienic conditions are assured by careful cleaning of equipment. Samples from down-stream processing are analyzed for the level of contamination and the finished enzyme preparation is analyzed for total viable counts, as well as for pathogenic micro-organisms. The final product has to meet the criteria formulated by the WHO/FAO Joint Experts Committee on Food Additives (JECFA) and the Food Chemicals Codex (FCC), including, where appropriate, the General Considerations and Specifications for Enzymes from Genetically Manipulated Organisms. Page 15 of 16 Guidelines for the Registration of Enzyme Based Products Used in Stock Feeds ATTACHMENT ENZYME BASED PRODUCTS USED IN ANIMAL FEEDS CLEARANCE/REGISTRATION PROCESS AQIS EXISTING ENZYME WITH PRIOR APPROVALS FOR USE IN FOOD (ANZFA, JECFA, FDA) IDENTITY EFFICACY SPECIFIC CLAIMS AQIS NEW ENZYME/SOURCE OGTR WITH NO PRIOR APPROVALS FOR USE IN FOODS TGA EA NOHSC ANZFA EFFICACY SPECIFIC CLAIMS Page 16 of 16
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