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Área de trabajo: Análisis de alimentos y bebidas.

Título: Análisis Multicomponente de Jarabe de Fructosa Usando un Analizador FT-NIR.

 Título original: Multi-component Analysis of Fructose Syrup using the Antaris FT-NIR Analyzer.

Autor: Chris Heil, Thermo Fisher Scientific, Madison, WI, USA.


Fructose corn syrup is produced in many parts of the world especially where corn supplies are abundant such as the United States. High fructose corn syrup (HFCS) is used in the soft drink and food industries as a direct replacement for sucrose (table sugar) as it has a similar sweetness. The most common grades of HFCS contain 42% and 55% fructose. High fructose corn syrup has many advantages over sucrose including longer shelf life, ease of transportation, ease of blending a liquid vs. a powder, and lower cost in areas where corn is plentiful. High fructose corn syrup is produced at large milling facilities that can process over 100,000 bushels of corn per day. If the process for making HFCS is disrupted, even for a short period of time, thousands of pounds of out-of-specification product can be produced. The process for making HFCS starts with separation of corn into its components, the main component of which is starch. Starch is a polysaccharide (C6H10O5)n consisting of a large number of glucose monosaccharide units joined together by glycosidic bonds. The corn starch is converted to individual glucose molecules by adding enzymes, heat, and by adjusting the pH in a process called saccharification. The saccharification product contains a very high percentage of glucose along with small percentages of maltose, triose and higher sugars due to incomplete conversion of the starch. Glucose and fructose are constitutional isomers (Figure 1) meaning they have the same molecular formula but different chemical structure. An isomerization enzyme (glucose isomerase) is added to the high glucose saccharification material to yield liquid containing 42% fructose. Further processing of this stream acts to increase the fructose percentage above 70%. The high fructose stream is then blended with a lower fructose stream to yield 55% HFCS. These two streams vary in fructose % over time due to the continuous flow nature of the milling process.


The precision, accuracy, and speed of FT-NIR spectroscopy combined with fiber optic probes for in-line analysis allows for real-time trending and closed-loop control of dynamically changing processes such as the blending of two process streams. The use of a multiplexing FT-NIR instrument capable of monitoring multiple process streams simultaneously, such as the Antaris MX FT-NIR process analyzer, would allow a production facility to monitor their entire process from reaction to purification to final product blending. For fructose syrup analysis, the Antaris FT-NIR analyzers are capable of monitoring the isomerization, adsorption separation, and fructose blending process steps due to its ability to accurately predict chemically similar carbohydrate components. The application of FT-NIR spectroscopy for carbohydrate profile will eliminate the use of HPLC in the QA lab and result in savings in disposable lab items such as eluent, columns, vials, syringes and filters. The ability of FT-NIR spectroscopy to perform real-time analysis on process streams allows for process optimization resulting in lower reprocess cost, higher plant production capacity, and an increase in the percentage of in-specification product.


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