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Scientific Opinion on the safety and efficacy of aliphatic and aromatic mono- and di-thiols and mono-, di-, tri-, and polysulphides with or without additional oxygenated functional groups (chemical group 20) when used as flavourings for all animal species

EFSA Journal 2013;11(5):3208 [34 pp.]. doi:10.2903/j.efsa.2013.3208
  EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) Panel Members Gabriele Aquilina, Alex Bach, Vasileios Bampidis, Maria De Lourdes Bastos, Lucio Guido Costa, Gerhard Flachowsky, Mikolaj Antoni Gralak, Christer Hogstrand, Lubomir Leng, Secundino López-Puente, Giovanna Martelli, Baltasar Mayo, Fernando Ramos, Derek Renshaw, Guido Rychen, Maria Saarela, Kristen Sejrsen, Patrick Van Beelen, Robert John Wallace and Johannes Westendorf Acknowledgment The Panel wishes to thank the members of the Working Group on Feed Flavourings, including Georges Bories, Paul Brantom, Andrew Chesson, Joop de Knecht, Jürgen Gropp and Anne-Katrine Lundebye Haldorsen, for the preparatory work on this scientific opinion. Contact FEEDAP@efsa.europa.eu
Type: Opinion of the Scientific Committee/Scientific Panel On request from: European Commission Question number: EFSA-Q-2010-00998 Adopted: 17 April 2013 Published: 13 May 2013 Last updated: 03 June 2013. This version replaces the previous one/s. Affiliation: European Food Safety Authority (EFSA), Parma, Italy
Abstract

Chemical group 20 consists of aliphatic and aromatic mono- and di-thiols and mono-, di-, tri-, and polysulphides with or without additional oxygenated functional groups, of which 31 are currently authorised for use as flavours in food. The FEEDAP Panel was unable to perform an assessment of six compounds (methanethiol, methyl propyl disulphide, dipropyl trisulphide, 3-mercaptobutan-2-one, 3-(methylthio)butanal and 3-methyl-1,2,4-trithiane) because of issues related to the purity of the compounds. The FEEDAP Panel concludes that the following 25 compounds are safe for the target species at the proposed maximum dose level (0.05 mg/kg complete feed): 3-(methylthio)propionaldehyde, methyl 3-(methylthio)propionate, allylthiol, dimethyl sulphide, dibutyl sulphide, diallyl disulphide, diallyl trisulphide, dimethyl trisulphide, dipropyl disulphide, allyl isothiocyanate, dimethyl disulphide, 2-methylbenzene-1-thiol, S-methyl butanethioate, allyl methyl disulphide, 3-(methylthio)propan-1-ol, 3-(methylthio)hexan-1-ol, 1-propane-1-thiol, diallyl sulphide, 2,4-dithiapentane, 2-methyl-2-(methyldithio)propanal, 2-methylpropane-1-thiol, methylsulfinylmethane, propane-2-thiol, 3,5-dimethyl-1,2,4-trithiolane and 2-methyl-4-propyl-1,3-oxathiane. No safety concern for the consumer would arise from the use of these 25 compounds of CG 20 up to the highest safe level in feedingstuffs for all animal species, with the exception of allyl isothiocyanate. Although additional exposure to this substance through its low use level in animal feeds would not substantially increase consumer exposure, the FEEDAP Panel notes that the estimated exposure of consumers is already higher than the acceptable daily intake (ADI). All compounds should be considered irritant to skin, eyes and respiratory tract and as skin sensitisers. The proposed concentration of 0.05 mg flavour/kg feed is not expected to cause detrimental effects to the environment, except for 2-methylpropane-1-thiol, for which 0.04 mg/kg is expected to be safe. Since all 25 compounds are used in food as flavourings and their function is essentially the same as that in food, no further demonstration of efficacy is necessary.

© European Food Safety Authority, 2013

Summary

Following a request from the European Commission, the Panel on Additives and Products or Substances used in Animal Feed (FEEDAP) was asked to deliver a scientific opinion on the safety and efficacy of 32 compounds (aliphatic and aromatic mono- and di-thiols and mono-, di-, tri- and polysulphides with or without additional oxygenated functional groups belonging to chemical group 20) when used as flavourings for all animal species. All additives except dimethyl tetrasulphide are currently authorised for use as flavours in food and all have been detected in plant materials, fruits and processed foods; however, reports of their distribution vary greatly. During the assessment, the applicant withdrew the application for dimethyl tetrasulphide.

The FEEDAP Panel was unable to perform an assessment of six compounds (methanethiol, methyl propyl disulphide, dipropyl trisulphide, 3-mercaptobutan-2-one, 3-(methylthio)butanal and 3-methyl-1,2,4-trithiane) because of issues related to the purity of the compounds.

The FEEDAP Panel concludes that the following 25 compounds are safe for the target species at the proposed maximum dose level (0.05 mg/kg complete feed): 3-(methylthio)propionaldehyde, methyl 3-(methylthio)propionate, allylthiol, dimethyl sulphide, dibutyl sulphide, diallyl disulphide, diallyl trisulphide, dimethyl trisulphide, dipropyl disulphide, allyl isothiocyanate, dimethyl disulphide, 2-methylbenzene-1-thiol, S-methyl butanethioate, allyl methyl disulphide, 3-(methylthio)propan-1-ol, 3-(methylthio)hexan-1-ol, 1-propane-1-thiol, diallyl sulphide, 2,4-dithiapentane, 2-methyl-2-(methyldithio)propanal, 2-methylpropane-1-thiol, methylsulfinylmethane, propane-2-thiol, 3,5-dimethyl-1,2,4-trithiolane and 2-methyl-4-propyl-1,3-oxathiane.

No safety concern for the consumer would arise from the use of these 25 compounds belonging to CG 20 up to the highest safe level in feedingstuffs for all animal species, with the exception of allyl isothiocyanate. Although additional exposure to this substance through its low use level in animal feeds would not substantially increase consumer exposure, the FEEDAP Panel notes that the estimated exposure of consumers is already higher than the acceptable daily intake (ADI).

The FEEDAP Panel considers it prudent to treat all 25 compounds under assessment as irritant to skin, eyes and respiratory tract and as skin sensitisers.

The proposed concentration of 0.05 mg flavouring compound/kg feed is not expected to cause detrimental effects to the environment, except for 2-methylpropane-1-thiol, for which 0.04 mg/kg is expected to be safe.

Since all 25 compounds are used in food as flavourings, and their function in feed is essentially the same as that in food, no further demonstration of efficacy is necessary.

Keywords

Sensory additives, flavourings, aliphatic and aromatic mono- and di-thiols and mono-, di-, tri- and polysulphides with or without additional oxygenated functional groups, chemical group 20