Notice of modification to the List of permitted food enzymes to authorize the use of chymosin B from Trichoderma reesei GICC03546 in sour cream and various cheeses

Notice of Modification – Lists of Permitted Food Additives
Reference Number: M-FAA-24-03
March 22, 2024


Food additives are regulated in Canada under Marketing Authorizations (MAs) issued by the Minister of Health and the Food and Drug Regulations (Regulations). Authorized food additives and their permitted conditions of use are set out in the Lists of Permitted Food Additives that are incorporated by reference in the MAs and published on the website. A petitioner can request that Health Canada authorize a new additive or a new source or a new condition of use for an already permitted food additive by filing a food additive submission with the Department's Food Directorate. Health Canada uses this premarket authorization process to determine whether the scientific data support the safety of food additives when used under specified conditions in foods sold in Canada.


Health Canada's Food Directorate received a food additive submission seeking authorization for the use of chymosin B from Trichoderma reesei GICC03546 in the manufacture of sour cream and various cheeses. The requested maximum level of use for this food enzyme is Good Manufacturing Practice.

At the time of the petitioner's submission, chymosin B from other sources was already permitted for use in the manufacture of the requested foods. However, the new source organism, T. reesei GICC03546, was not a permitted source for any food enzyme in Canada.

Rationale for action

Health Canada's Food Directorate completed a premarket safety assessment of chymosin B from T. reesei GICC03546 for use as a milk clotting enzyme in the manufacture of sour cream and various cheeses. The Directorate considered allergenicity, chemistry, microbiology, molecular biology, nutrition, and toxicology in the assessment. The results of the assessment support the safety of chymosin B from T. reesei GICC03546 for its requested use. Therefore, Health Canada has modified the List of Permitted Food Enzymes to authorize the use of chymosin B from T. reesei GICC03546 by adding this new source and its corresponding entries to columns 2, 3 and 4 of item "C.3 (ii) Chymosin B", as shown below (in bold font in this Notice to illustrate the addition). For the definition of "Good Manufacturing Practice" set out in column 4 as a Maximum Level of Use, see the Marketing Authorization for Food Additives That May Be Used as Food Enzymes.

Modification to the List of Permitted Food Enzymes
Item No.
Column 1
Column 2
Permitted Source
Column 3
Permitted in or Upon
Column 4
Maximum Level of Use and Other Conditions
C.3 (ii) Chymosin B Trichoderma reesei GICC03546 Cheddar cheese; (naming the variety) cheese; Cottage cheese; Cream cheese; Cream cheese with (naming the added ingredients); Cream cheese spread; Cream cheese spread with (naming the added ingredients); Sour cream Good Manufacturing Practice

Other relevant information

Food additives such as chymosin B are required to meet food-grade specifications set out in Part B of the Regulations, where such specifications exist, or those set out in the most recent edition of the Food Chemicals Codex or the Combined Compendium of Food Additive Specifications where there are no specifications in Part B. The Food Chemicals Codex is a compendium of food-grade specifications for food ingredients, including food additives, published by the United States Pharmacopeial Convention. Specifications in the Combined Compendium of Food Additive Specifications and its associated General Specifications and Considerations for Enzyme Preparations are prepared by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), both of which are published by the Food and Agriculture Organization of the United Nations.

Implementation and enforcement

The above modification came into force March 21, 2024, the day it was published in the List of Permitted Food Enzymes.

The Canadian Food Inspection Agency is responsible for the enforcement of the Food and Drugs Act and its associated regulations with respect to foods.

Contact information

Health Canada's Food Directorate is committed to reviewing new scientific information on the safety in use of any permitted food additive. Anyone wishing to submit an inquiry or new scientific information on the use of a permitted food additive may do so in writing, by regular mail or e-mail. If you wish to contact the Food Directorate by e-mail about chymosin B from T. reesei GICC03546, please use the words "chymosin B (M-FAA-24-03)" in the subject line of your e-mail.

Bureau of Chemical Safety, Food Directorate
251 Sir Frederick Banting Driveway
Tunney's Pasture, PL: 2202C
Ottawa, Ontario K1A 0K9

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