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rice fructose syrup machine manufacturer-high fructose corn syrup manufacturing process


In the contemporary process, corn is milled to extract corn starch and an "acid-enzyme" process is used, in which the corn-starch solution is acidified to begin breaking up the existing carbohydrates. It is necessary to carry out the extraction process in the presence of mercuric chloride (0.01 M) in order to inhibit endogenous starch-degrading enzymes.:374–376 High-temperature enzymes are added to further metabolize the starch and convert the resulting sugars to fructose.:808–813 The first enzyme added is alpha-amylase, which breaks the long chains down into shorter sugar chains – oligosaccharides. Glucoamylase is mixed in and converts them to glucose; the resulting solution is filtered to remove protein, then using activated carbon, and then demineralized using ion-exchange resins. The purified solution is then run over immobilized xylose isomerase, which turns the sugars to ~50–52% glucose with some unconverted oligosaccharides and 42% fructose (HFCS 42), and again demineralized and again purified using activated carbon. Some is processed into HFCS 90 by liquid chromatography, then mixed with HFCS 42 to form HFCS 55. The enzymes used in the process are made by microbial fermentation.


On the following use the starch for example to introduce our high fructose corn syrup production plant. High fructose corn syrup production process mainly include three section, that is starch liquefaction, saccharification and isomerism process. The detail manufacturing process flowchart as below(you can click high fructose corn syrup production equipment to learn the complete production process):

(1) Liquefaction:


Starch slurry mixed with 30-35% dry solids and adjust its PH value to 6.0-6.4. Before put into α-enzyme, first add calcium, because calcium ions can stabilize the enzyme. Then mixed heat-stable α-enzyme (Novo’s Termamyl 120L) into the starch slurry, the slurry is instantaneously heated to 100 ℃ and held at this temperature for 10 min before it is cooled to 90 ℃. This temperature is maintained for 1-3h service for further hydrolyze the starch.


This process directly decided the yield in the high fructose corn syrup production plant, also can understand this as the starch using rate.


Liquefaction process technical parameters:


-Starch slurry concentration: 32%-36%


-α-enzyme: 8-10g per ton dry starch


-PH value: before: 6.0-6.4    after: 4.2-4.5


-Temperature: different value in different section


-Liquefaction solution DE value: 15%-20%

After this liquefying process completed in the high fructose corn syrup production plant, the starch has been transfered into dextrins with a dextrose equivalent (DE) between 15 and 20. (The physical properties of the syrup changed with the DE and the method of manufacture difference.) DE is the total reducing sugar in the syrup expressed as dextrose on a dry weight basis.


(2) Saccharification process introduction:


After liquefaction, the ph value is reduced to between 4.2 and 4.5, after the solution is cooled to 60 ℃. Added the glucomylase (Novo’s AMG 300L) immediately. The reaction time for saccharification is usually between 24-48 hour depending on enzyme reaction speed. Glucoamylase releases single glucose units from the ends of dextrin molecule. Syrups of 95% glucose or higher are manufactured. This is the saccharification process for the F42 high fructose corn syrup production plant process. This section high influenced on the flavour of the high fructose corn syrup production.


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