Preliminary Study on the Use of Inexpensive, Unsaturated Vegetable Oils as Surface Sealants in the Long- and Short-Term Storage of Syrup Feedstocks from Sweet Sorghum
- 65 Downloads
For large-scale manufacture of biofuels and bioproducts from sweet sorghum (Sorghum bicolor L. Moench) biomass feedstocks, the long-term storage of 65 Brix (% dissolved solids) syrups is urgently needed for year-round supply and operation, efficient transport, and acceptable end-product yields. Shorter-term storage of lower Brix syrups is also required for direct fermentation. Three unsaturated, inexpensive, and readily available vegetable oils were preliminary evaluated as surface sealants (0–1.7 cm-deep layers) on stored 65 Brix sweet sorghum syrups at 25 °C. Compared to no sealant, soy bean, canola, and sunflower oil sealants preserved the 65 Brix syrups for up to 1 year. There was generally a strong surface oil layer effect, with 1.7 cm-deep layers providing the most significant (P < 0.05) protection. Soy bean oil (up to 0.5 cm) did not preserve 28 Brix syrups against severe microbial deterioration over 7 days of storage. More replicated studies are now needed to validate the results.
KeywordsSweet sorghum Bioproducts Syrup feedstocks Storage stability Surface sealants Vegetable oils
The authors thank Dr. Michael Dowd of USDA-ARS-SRRC in New Orleans for undertaking the oil analyses experiments. Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. USDA is an equal opportunity provider and employer.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Adams, J. 2016. Oil technology in food product development. Prepared Foods. May Edn: 74–86.Google Scholar
- Eggleston, G., and M. Grisham. 2003. Oligosaccharides in cane and their formation on cane deterioration. In ACS symposium series 849, ed. Eggleston G and Cote G., Chapter 16, 211–232. Oxford: Oxford Univ. Press.Google Scholar
- Eggleston, G., and J.M. Huet. 2012. The measurement of mannitol in sugar beet factories to monitor deterioration and processing problems. Zuckerindustrie 137: 33–39.Google Scholar
- Eggleston, G., B. Andrzejewski, C. Alexander, A. Monge, E. St, M. Cyr, H.Sohljoo Marquette, and K. Pontif. 2011. Design and operation of a pilot-plant for the processing of sugarcane juice into sugar at the Southern Regional Research Center in Louisiana. International Sugar Journal 113: 863–872.Google Scholar
- Eggleston, G., B. Andrzejewski, M. Cole, C. Dalley, S. Sklanka, Y.J. Chung, E. St. Cyr, and R. Powell. 2015a. Novel storage technologies for raw and clarified sweet sorghum syrup biomass feedstocks from sweet sorghum (Sorghum bicolor L. Moench) pilot plant conditions. Biomass and Bioenergy 81: 424–436.CrossRefGoogle Scholar
- Eggleston, G., S. Boone, L. Wartelle, A. Triplett, M. Heckemeyer, R. Powell, and M. Wright. 2017. Use of inexpensive vegetable oils to ensure the long-term stability of sweet sorghum syrups for the manufacture of bioproducts. Proceedings in Advances in Sugar Crop Processing and Conversion conference 1: 202–223.Google Scholar
- Hatch, R.O., M. Giles, S. Creiglow, and D.R. Smith. 2013. Propylene glycolate used as a top coat seal to protect thick juice from degradation in ellipsoid storage tanks. Zuckerindustrie 138: 215–218.Google Scholar
- Katz, D.S. 2008. The streak plate protocol [Laboratory Protocols]. Retrieved from http://www.microbelibrary.org/component/resource/laboratory-test/3160-the-streak-plate-protocol.
- Koninckx, J. 2013. Biorefinery beckons. Iowa plant will produce ethanol from corn stover. Chemical Processing Jan edn: 38–39.Google Scholar
- Muller, V. 2001. Bacterial fermentation. Encyclopedia of Life, 1–7. www.els.net.
- Ottewell, S. 2016. Chemical makers roll out more bio-based feedstocks. Chemical Processing Nov edn: 20–24.Google Scholar
- Reiner, K. 2010. Catalase test protocol [Laboratory Protocols]. Retrieved from http://www.microbelibrary.org/library/laboratory+test/3226-catalase-test-protocol.
- Reynolds, J. 2005. Serial dilution protocol [Laboratory Protocols]. Retrieved from http://www.microbelibrary.org/component/resource/laboratory-test/2884-serial-dilution-protocols.
- Shields, P., and Cathcart, L. 2010. Oxidase test protocol [Laboratory Protocols]. Retrieved from http://www.microbelibrary.org/library/laboratory+test/3229-oxidase-test-protocol.
- Thaer, R.K., K. Jundergmann, and K. Decker. 1977. Energy conservation in chemotrophic anaerobic bacteria. Bacteriology Reviews 41: 100–180.Google Scholar
- Wise, H. 2006. Preparing spread plates protocols [Laboratory Protocols]. Retrieved from http://www.microbelibrary.org/component/resource/laboratory-test/3085-preparing-spread-plates-protocols.