Evaluation of Two Sets of Sorghum Bagasse Samples as the Feedstock for Fermentable Sugar Recovery via the Calcium Capturing by Carbonation (CaCCO) Process

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  • Shiroma Riki
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO) Department of Subtropical Biochemistry and Biotechnology, Faculty of Agriculture, University of Ryukyus
  • Li Yuan
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO)
  • Park Jeung-yil
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO)
  • Wu Long
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO)
  • Kaneko Satoshi
    Department of Subtropical Biochemistry and Biotechnology, Faculty of Agriculture, University of Ryukyus
  • Takai Tomoyuki
    Forage Crop Breeding Unit, National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • Gau Mitsuru
    Forage Crop Breeding Unit, National Agricultural Research Center for Kyushu Okinawa Region, NARO
  • Ike Masakazu
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO)
  • Tokuyasu Ken
    Carbohydrate Laboratory, Food Resource Division, National Food Research Institute, National Agriculture and Food Research Organization (NARO)

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  • Evaluation of Two Sets of Sorghum Bagasse Samples as the Feedstock for Fermentable Sugar Recovery <i>via</i> the Calcium Capturing by Carbonation (CaCCO) Process

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<p>Abstract: Sorghum bagasse samples from two sets (n6 and bmr6; n18 and bmr18) of wild-type and corresponding “brown midrib” (bmr) mutant strains of sweet sorghum were evaluated as the feedstock for fermentable sugar recovery via the calcium capturing by carbonation (CaCCO) process, which involves Ca(OH)2 pretreatment of bagasse with subsequent neutralization with CO2 for enzymatic saccharification. Saccharification tests under various pretreatment conditions of the CaCCO process at different Ca(OH)2 concentrations, temperatures or residence periods indicated that bmr strains are more sensitive to the pretreatment than their counterparts are. It is expected that variant bmr6 is more suitable for glucose recovery than its wild-type counterpart because of the higher glucan content and better glucose recovery with less severe pretreatment. Meanwhile, bmr18 showed higher scores of glucose recovery than its counterpart did, only at low pretreatment severity, and did not yield higher sugar recovery under the more severe conditions. The trend was similar to that of xylose recovery data from the two bmr strains. The advantages of bmr strains were also proven by means of simultaneous saccharification and fermentation of CaCCO-pretreated bagasse samples by pentose-fermenting yeast strain Candida shehatae Cs 4R. The amounts needed for production of 1 L of ethanol from n6, bmr6, n18, and bmr18 samples were estimated as 4.11, 3.46, 4.03, and 3.95 kg, respectively. The bmr strains seem to have excellent compatibility with the CaCCO process for ethanol production, and it is expected that integrated research from the feedstock to bioprocess may result in breakthroughs for commercialization.</p>

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