YenzoWhat is E1105 (lysozyme)?
E1105 is lysozyme. In Appendix 1 of Circular 24/2019/TT-BYT the functions listed for it are preservative.
E1105Lysozyme
E1105 is lysozyme (INS 1105). In Circular 24/2019/TT-BYT it is listed in Appendix 1 with the functions: preservative. Lysozyme is also an active ingredient in throat lozenges; this page is about its role as a food preservative (E1105). (source: Therapeutic comparison of throat lozenges (Munch Med Wochenschr 1981))
Did you know? In EFSA's 2025 opinion, the lysozyme food enzyme under evaluation is produced from hens' eggs.
- Code
- E1105 · INS 1105
- Group
- Preservative
In Vietnam✓ PermittedOn the list of permitted additives — Circular 24/2019, Appendix 1
Risk level on the Yenzo Scalevery low?Based on the Open Food Facts additives taxonomy
How E1105 appears on labels
IngredientsIllustrative example
Wheat flour, vegetable oil, salt, sugar, preservative (1105), dried onion and garlic, pepper, natural colour (160a).
preservative (1105)preservative 1105E1105INS 1105On Vietnamese labels: Lysozym
Lysozyme in food
Questions about lysozyme
Is lysozyme harmful?
In 2025 EFSA evaluated the food enzyme lysozyme from hens' eggs and concluded that it does not give rise to safety concerns under the intended conditions of use. EFSA also noted that lysozyme from egg is an allergen and considered that there is a risk of allergic reactions for egg-allergic individuals.
Is E1105 permitted in Vietnam?
Yes. Lysozyme (INS 1105) is listed in Appendix 1 of Circular 24/2019/TT-BYT, the list of additives permitted in food.
Other preservatives
E283Potassium propionatelowE284Boric acidhighE285Sodium tetraborate (borax)highE290Carbon dioxidevery lowE385Calcium disodium EDTAlowE386Disodium EDTAlow
See all preservatives →Updated 22 October 2026
Sources (3)
- Open Food Facts additives taxonomy (Yenzo's table cites no EFSA opinion for this code). Open Food Facts additives taxonomy, https://github.com/openfoodfacts/openfoodfacts-server/blob/main/taxonomies/additives.txt (entry en:e1105)
- Thông tư 24/2019/TT-BYT (văn bản hợp nhất 09/VBHN-BYT), Phụ lục 2A: nhóm thực phẩm được phép dùng INS 1105
- EFSA Journal (2025). Safety evaluation of the food enzyme lysozyme from hens' eggs