Tesco Fast Action Dried Yeast - Review - Baking Ways

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Tuesday, February 21, 2012

Tesco Fast Action Dried Yeast - Review

The Tesco Fast Action Dried Yeast can be easily found in some Tesco shop in Ireland.If we look at the back of the packet we can read"A blend of dried yeast with yeast improvers"IngredientsYeast (93%)Calcium SulphateEmulsifier (Sorbitan Monostearate)Flour treatment Agent (Ascorbit Acid)Alpha AmylaseIt is pretty clear that what Tesco sells for dried yeast, it is actually a blend of yeast and dough improvers.Let's look now at the action of each of themCalcum Sulphate = pH regulatorEmulsifier (Sorbitan Monostearate) = It is a chemical that are soluble in both water and oil and should strengthen the dough and act as a rehydrating factorAscorbic Acid = It strengthen the dough as an oxidiser which encourages the formation of cross-bonds interlinking the gluten network. Alpha Amylase = From wiki "Amylases find use in bread making and to break down complex sugars, such as starch (found in flour), into simple sugars. Yeast then feeds on these simple sugars and converts it into the waste products of alcohol and CO2. This imparts flavour and causes the bread to rise. While amylases are found naturally in yeast cells, it takes time for the yeast to produce enough of these enzymes to break down significant quantities of starch in the bread. This is the reason for long fermented doughs such as sour dough. Modern bread making techniques have included amylases (often in the form of malted barley) into bread improver, thereby making the process faster and more practical for commercial use."While it is kind of common to find ascorbic acid in Instant Yeast or Calcium Sulphate, I don't think that the presence of Alpha Amylase make this yeast suitable for long fermentation dough I would not recommend using the Tesco Dried Yeast Blend for serious home baking.Measuring and Weighting Tesco Dried Yeast.After few empirical test, I found that the following inequalities hold truetsp = teaspoon2 tsp= 2 teasoopn1/2 tps = half teaspoon1/4 tsp = tad1/16 tsp = pinch1/32 tsp = smidgen2 tsp + 1/2 tsp + 1/4 tsp + 1/16 tps + 1/32 tsp < 7gr2 tsp + 1/2 tsp + 1/4 tsp + 1/16 tps + 1/32 tsp + 1/32 tsp > 7gr 2 tsp + 1/2 tsp + 1/4 tsp + 1/16 tps + 1/32 tsp + 3/4 * 1/32 tsp =~ 7grThe first two tells me that a teapoon of Tesco Dried Yeast must be2.43gr < tsp < 2.46grThe third says that it is likely that 1tsp = 2.44grSo if you want to measure up Tesco Dried-Yeast (which is a blend)1 tsp = 2.44gr1/2 tsp = 1.22gr1/4 tsp = tad = 0.6gr1/8 tsp = dash = 0.3gr1/16 tsp = pinch = 0.15gr1/32 tsp = smidgen = 0.08gr1/64 tsp = drop = 0.04grSo if you need to prepare a 12hr Poolish which requires 0.2% of fresh yeast for 250gr of flour, using a conversion factor of 40% from frest to instant you get250gr * 0.2% * 40% = 0.2grYou will need a Pinch + a Drop of Instant YeastOr if you don't have a drop (not easy to find here in the shops in Dublin)a Pinch + half a smidgen. Posted by Pierpaolo Labels: acid, alpha amylase, ascorbic acid, blend, dried, emlsifier, fast action, intstant, tesco, yeast

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    • Tesco Fast Action Dried Yeast - Review
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