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Application of permanganate to reduce microbial contamination and sugar loss in raw-sugar production in Louisiana, USA

Author:
Boone, Stephanie A., Ihli, Sam, Hartsough, Dan, Hernandez, Louis, Sanders, John, Klasson, Kjell T., Lima, Isabel M.
ISSN:
0020-8841
Subject:
Leuconostoc, bacterial contamination, brix, harvest date, laboratory experimentation, manganese, manganese dioxide, mannitol, microbial growth, microbial load, molasses, raw sugar, sugar industry, sugarcane juice, Louisiana
Abstract:
During the 2016-2018 harvest seasons, some sugarcane factories in Louisiana applied permanganate to mill tandems and other factory locations. Brix, purity, sugar content, microbial growth and mannitol were evaluated, as well as manganese distribution in the raw sugar process. Sample collection included crusher juice, mixed juice, clarified juice, syrup and final molasses. In concurrent studies, samples were collected and brought back to the laboratory for studies under controlled conditions. Both laboratory and factory samples treated with permanganate indicated a reduction in microbial contamination. Leuconostoc contamination was reduced by 94% in laboratory tests and microbial load in factory mixed juice was reduced from 2.2 OD600nm to 0.8-1.3 OD600nm. Factory treated samples also showed decreases in mannitol and increases in glucose:fructose ratio and purity. These trends were taken as strong indication of lower microbial load. There was a statistically significant difference between treated and untreated mixed juice purity. Juice purity losses (from crusher to mixed juice) were reduced from 1.55% to 0.80% during permanganate application, when long term factory data were evaluated. During permanganate application, the highest concentration of manganese was found in clarifier mud, indicating that permanganate is passively discarded from raw-sugar processing as insoluble manganese dioxide. Leuconostoc contamination was reduced by 94% in laboratory tests and microbial load in factory mixed juice was reduced from 2.2 OD600nm to 0.8-1.3 OD600nm. Factory treated samples also showed decreases in mannitol and increases in glucose:fructose ratio and purity. All this was taken as strong indication of lower microbial load. There was a statistically significant difference between treated and untreated mixed juice purity. Juice purity loss (from crusher to mixed juice) were reduced from 1.55% to 0.80% during permanganate application, when long term factory data were evaluated. During permanganate application, the highest concentration of manganese was found in clarifier mud, indicating that permanganate is passively discarded from raw-sugar processing as insoluble manganese dioxide.
Agid:
6937448
Handle:
10113/6937448