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High‐conversion hydrolysates and corn sweetener production in dry‐grind corn process
Author(s) -
Wang Zhaoqin,
Sharma Vivek,
Dien Bruce S.,
Singh Vijay
Publication year - 2018
Publication title -
cereal chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.558
H-Index - 100
eISSN - 1943-3638
pISSN - 0009-0352
DOI - 10.1002/cche.10030
Subject(s) - starch , chemistry , grind , wet milling , glucose syrup , food science , hydrolysate , fermentation , pulp and paper industry , hydrolysis , biochemistry , materials science , organic chemistry , grinding , engineering , composite material
Background and Objectives Industrial processing of the US corn is primarily for fuel ethanol, distillers dried grains with solubles ( DDGS ), and crude oil production, using the dry‐grind process. Refining of corn starch for glucose syrup production requires wet‐milling process. However, wet‐milling process is capital expensive, labor and energy intensive, compared with dry‐grind process. The liquefaction and saccharification steps of the corn dry‐grind process are similar to those used for processing wet‐milled starch into glucose syrup. The objective of this study was to determine the feasibility of adapting the corn dry‐grind process for corn syrup production. Findings In the adapted conventional dry grind with modified refining process, the starch to glucose conversion efficiencies (95.69 ± 0.29%) were similar with that from wet‐milled corn starch (95.05 ± 0.88%). High soluble protein content in starch hydrolysate can affect its conversion to syrup. The protein content of hydrolysates from the dry‐grind process was 0.4%, which is higher than the maximum concentration (0.3%) specified by the starch refining industry. To reduce the protein content, a thermal treatment was developed to remove soluble protein. Thermal treatment removed the soluble protein to negligible level without affecting the high starch to glucose conversion efficiency (94.61 ± 1.34%). Conclusions High‐purity corn syrup production was achieved in a conventional dry‐grind process with a modified refining process. Modified dry‐grind process has a comparable starch conversion efficiency with wet‐milling process. Significance and novelty Production of refined corn syrup (starch hydrolysate) from the dry‐grind process would be advantageous for expanding the number and value of possible co‐products. The potential of refined corn syrup production in dry‐grind process was evaluated.