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Bhagia, Samarthya; Ferreira, Jorge F. S.; Kothari, Ninad; Nunez, Angelica; Liu, Xuan; da Silva Dias, Nildo; Suarez, Donald L.; Kumar, Rajeev; Wyman, Charles E.
Biotechnology and bioengineering, June 2018, Letnik: 115, Številka: 6Journal Article
Currently, major biofuel crops are also food crops that demand fertile soils and good‐quality water. Jerusalem artichoke (Helianthus tuberosus, Asteraceae) produces high tonnage of tubers that are rich in sugars, mainly in the form of inulin. In this study, plants of the cultivar “White Fuseau” grown under five salinity levels were evaluated for tuber yield. Results indicated that this cultivar is moderately salt‐tolerant if the goal is tuber production. Hydraulic pressings of the tubers produced juice that contained 15% (wet weight) or 55% (dry weight) free sugars, with 70% of these in the form of inulin and the rest as fructose, sucrose, and glucose. Importantly, salinity did not affect the total free sugar or inulin content of the tubers. Tubers were composed of about 12% dry washed bagasse (wet weight) or 44% (dry matter basis) and bagasse retained such high quantities of free sugars after pressing that washing was required for complete sugar recovery. Chemical composition analysis of tuber bagasse suggested that it had low lignin content (11–13 wt%), and its structural sugar composition was similar to chicory root bagasse. Because of the high hemicellulose and pectin content of the bagasse, adding xylanase and pectinase to cellulase substantially improved sugar yields from enzymatic hydrolysis compared to at the same protein loading as cellulase alone. In addition to the high total sugar yield of tuber, these first findings on the sugar and lignin content and enzymatic hydrolysis of tuber bagasse can lead to low‐cost production of ethanol for transportation fuels. The high free sugars and bagasse yields measured after hydraulic pressings of tubers of Jerusalem artichoke irrigated with low to high salinity water show Jerusalem artichoke to be very promising for biofuels production. The structural sugar composition of tuber bagasse was similar to that of chicory root bagasse. Application of a mixture of cellulase, xylanase, and pectinase proved to release more sugars by enzymatic hydrolysis of tuber bagasse than when cellulase alone was used at the same mass protein loading.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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