why should ketoses not react with benedict's reagent
Benedict's reagent Generally, Benedict's test detects the presence of aldehydes and alpha-hydroxy-ketones, also by hemiacetal, including those that occur in certain ketoses. Thus, although the ketose fructose is not strictly a reducing sugar, it is an alpha-hydroxy-ketone, and gives a positive test because it is converted to the aldoses glucose and mannose by the base in the reagent.
High-fructose corn syrup Commercial production of corn syrup began in 1864.[3]:17 In the late 1950s, scientists at Clinton Corn Processing Company of Clinton, Iowa tried to turn glucose from corn starch into fructose, but the process was not scalable.[3]:17[24] In 1965â€“1970 Yoshiyuki Takasaki, at the Japanese National Institute of Advanced Industrial Science and Technology (AIST) developed a heat-stable xylose isomerase enzyme from yeast. In 1967, the Clinton Corn Processing Company obtained an exclusive license to a manufacture glucose isomerase derived from Streptomyces bacteria and began shipping an early version of HFCS in February 1967.[3]:140 In 1983, the FDA approved HFCS as Generally Recognized as Safe (GRAS), and that decision was reaffirmed in 1996[25]