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They concluded that thermal decomposition of sucralose commences at 119ºC with liberation of HCl and water. More recently, Rahn and Yaylayan (2010) raised new concerns about the stability and safety of sucralose in heated applications. Like Hutchinson et al. (1999) and Bannach et al. (2009), Rahn and Yaylayan (2010) concluded that sucralose undergoes thermal degradation. Further, Rahn and Yaylayan (2010) found that chloropropanols were generated when sucralose was heated in the presence of glycerol. Chloropropanols comprise a group of contaminants that include known genotoxic, carcinogenic, and tumorigenic compounds (Biles and Piper, 1983; Cho et al., 2008, Tritscher, 2004; SCF, 2001; WHO, 2002). Rahn and Yaylayan (2010) concluded that "caution should be exercised in the use of sucralose as a sweetening agent during baking of food products containing glycerol and or lipids due to the potential formation of toxic chloropropanols." Other chlorinated compounds including dibenzo-p-dioxins and dibenzofurans, dioxin-like polychlorinated biphenyls, and polychlorinated naphthalenes were also generated by heating sucralose in the presence of foods (Dong et al., 2011, 2013; Wu et al., 2011). Overall, these studies indicate that sucralose is not stable at elevated temperatures, and that the compounds generated were affected by the other ingredients in the mixture.

The TFA wild blueberry is quite a mild flavour as a stand alone it needs another blueberry adding to give it some body, but it's a great fresh taste for adding a subtle hint to a mix.

Blueberry is my favorite flavour so far I've got a few steeping so cant say which is best for me yet.

TFA Blueberry wild, nice and fresh but weak. Needs around 8-15% in a mix.
TFA Blueberry extra, stronger and more sweet/fake taste, good mixed with the wild.
Flavour west Blueberry, steeping but maybe 10% as a single mix is recommeded to start.
Inawera Blueberry, Steeping 3% is recommeded smells nice though.
Solub Arome Blueberry, not sure yet first try seems ok and not over sweet I've started at 10% but I think it will need more
Alchemists cupboard Blueberry, works well with the TFA wild, not sure on % yet.

I find with all that I've tried so far is too much flavour seems to give a bad aftertaste that and some sweetners kill the flavour (cap super sweet) where as flavour west sweetner did not and if you cant taste anything at 15% then it's time for a week or two of menthol only.