I've made my first secondary batch, using two table spoons of liquid whey /l from the BioGaia tablets batch:
(cow milk full fat, this time without cream. Again no inuline or starch. 12grs dextrose/l)
No whey separated at all.
The whole product is almost like a watery emulsion. Like almost liquid jello.
There's no particular smell. No particular taste. Very neutral. Totally different from my primary BioGaia tablet batches with their strong separation and tangy, cheesy flavor.
It made me wonder if there was any L.reuteri in the whey I had used.
Is this normal?
The pH is ≤4.0. So there's clearly been production of lactic acid.
Maybe I'll add half a gram of l-glutamine if that may help the reuteri to survive and duplicate even when not competing with other bacteria.
Accidentally, whilst looking for GABA-producing microbacteria (L. reuteri does not contribute, the small amount it produces merely helps its acid resistance. But it feeds of glutamine for that, much more than off glutamate),
The pH of the jars in which I had added 1g/l L-Glutamin is also ≤4.0.
Tastewise the L-Glut supplemented yoghurt is distinctly more sour!