Preparing sugar syrup with high fructose content, by preparing clarified and demineralized sweet juice from herbal material, treating juice by hydrolyzing sucrose into fructose and glucose, and separating glucose from fructose fraction

摘要

The process for preparing a sugar syrup with high content of fructose, comprises preparing a clarified and demineralized sweet juice from a herbal material, treating the juice by hydrolyzing the sucrose into fructose and glucose to obtain a simple sugar composition having a first fructose fraction and a glucose fraction, separating the glucose fraction from the first fructose fraction and isomerizing the glucose into fructose to form a second fraction of fructose, and combining the first and second fractions of fructose and then concentrating into a sugar syrup rich in fructose. The process for preparing a sugar syrup with high content of fructose, comprises preparing a clarified and demineralized sweet juice from a herbal material, treating the juice by hydrolyzing the sucrose into fructose and glucose to obtain a simple sugar composition having a first fructose fraction and a glucose fraction, separating the glucose fraction from the first fructose fraction and isomerizing the glucose into fructose to form a second fraction of fructose, and combining the first and second fractions of fructose and then concentrating into a sugar syrup rich in fructose. The process is carried out with a fruit such as apple, peach, nectarine and grapes. The sweet juice has a color less than ICUMSA 45 (international commission for uniform methods of sugar analysis), and presents a rate of conductimetric ash of less than 0.4%. A partial elimination of sorbitol present in the fruit is carried out by elution chromatography prior to prepare the juice. The juice is subjected to centrifugation of 5000 g, ultrafiltration on a porous membrane having cut-off threshold of 2.5 kDa by applying a transmembrane pressure of 7 bars, electrodialysis for eliminating ionic charges of the juice, and chromatography. The electrodialysis is carried out with selected working parameters for obtaining a liquid composition of conductivity of less than 800 mu Scm - 1 at 50[deg] C. The chromatography is carried out on ion exchange resins with a strong cationic resin and a weak anion resin. The sweet juice is prepared before subjecting it to centrifugation and to pectolytic enzyme action. The simple sugar composition is purified and isomerized by subjecting the simple sugar composition to the elution chromatography on a Ca 2 + cationic resin column for glucose-fructose separation, and subjecting the glucose fraction to isomerization of glucose into fructose. The cationic resin column comprises two exit valves operated alternately to perform a glucose-fructose separation and a fructose-sorbitol separation. The final fructose fraction is subjected to demineralization on two resin mixed bed, a strongly acidic cation and anion exchanger, active carbon treatment at 60[deg] C, and concentration using a vacuum evaporation technique at low temperature. Filtration is carried out at the exit of the active carbon treatment. The final fructose fraction is concentrated until the sugar syrup obtains a sugar concentration of 60%. Independent claims are included for: (1) a sugar syrup; and (2) an installation for preparing a sugar syrup.