What is High Fructose Starch-based Syrups?
glucose syrup processing
High Fructose Starch-based Syrups are produced from refined very high DE glucose syrups. An enzymatic process using isomerase fixated on a resin facilitates the conversion of glucose to fructose. By using more resin columns in parallel the enzyme activity is completely exhausted before a refill.
The isomerase catalyses the formation of 42% fructose in equilibrium with glucose. This syrup may be refined and evaporated as such and it is an excellent all-purpose sweetener.
In order to obtain a more perfect match with sucrose based liquid sugar (cane and beet sugar) the fructose content has to be increased to 55% by enrichment. A stream of HFSS-42 is fractionated. Previous attempts to do this by crystallisation have never gained industrial acceptance. The fractionation is done more elegantly by chromatography. By auto-matically switching the injection point an endless ring column is simulated and the HFSS-42 is fractionated in fructose and glucose. Water or condensate is used to eluate the column. The fructose fraction is backmixed with the HFSS-42 to make up an HFFS-55. In this way a perfect match with traditional sucrose based liquid sugar is obtained. The HFSS-55 finds widespread use as sweetener in soft drinks.
The fructose fraction from the chromatographic column can of course be refined and evaporated to a syrup separately as HFSS-90 finding applications in low calorie foods.
Demineralisation throughout the HFSS-process and precautions against de-cross-linking by oxygen extends the lifetime of the resins. An HFSS-section should preferably run continuously non-stop.
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