Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, People's Republic of China; College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, People's Republic of China.
Nanjing Hydraulic Research Institute, R&D High Technology Corporation, People's Republic of China.
Bioresour Technol. 2018 Aug;261:288-293. doi: 10.1016/j.biortech.2018.04.040. Epub 2018 Apr 10.
One of the major obstacles in process of lignocellulosic biorefinery is the utilization of pre-hydrolysate from pre-treatment. Although lignocellulosic pre-hydrolysate can serve as an economic starting material for xylonic acid production, the advancement of xylonic acid or xylonate is still limited by further commercial value or applications. In the present study, xylose in the high concentration wheat straw pre-hydrolysate was first in-situ biooxidized to xylonate by Gluconobacter oxydans. To meet the needs of commercialization, crude powdered calcium xylonate was prepared by drying process and calcium xylonate content in the prepared crude product was more than 70%. Then, the calcium xylonate product was evaluated as concrete admixture without any complex purification steps and the results demonstrated that xylonate could improve the performance of concrete. Overall, the crude xylonate product directly produced from low-cost wheat straw pre-hydrolysate can potentially be developed as retarding reducer, which could subsequently benefit lignocellulosic biorefinery.
木质纤维素生物炼制过程中的主要障碍之一是预处理后的水解物的利用。虽然木质纤维素预处理水解物可以作为生产戊二酸或戊酸盐的经济起始原料，但戊二酸或戊酸盐的进一步发展仍然受到进一步商业价值或应用的限制。在本研究中，首先通过氧化葡萄糖酸杆菌将高浓度的小麦秸秆预处理水解物中的木糖原位生物氧化为戊酸盐。为满足商业化需求，通过干燥工艺制备了粗粉状的戊酸钙，所制备的粗产品中的戊酸钙含量超过 70%。然后，在无需复杂的纯化步骤的情况下，将戊酸钙产品用作混凝土外加剂进行评估，结果表明戊酸盐可以改善混凝土的性能。总的来说，直接从低成本的小麦秸秆预处理水解物生产的粗戊酸钙产品有可能被开发为延迟减水剂，这将有利于木质纤维素生物炼制。
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