Bean cells that have been habituated to grow in a lethal concentration （12 μM） of 2,6-dichlorobenzonitrile （dichlobenil or DCB, a cellulose biosynthesis inhibitor） are known to have decreased cellulose content in...Bean cells that have been habituated to grow in a lethal concentration （12 μM） of 2,6-dichlorobenzonitrile （dichlobenil or DCB, a cellulose biosynthesis inhibitor） are known to have decreased cellulose content in their cell walls. Xyloglucan, which is bound to cellulose and together with it forms the main loading network of plant cell walls, has also been described to decrease in habituated cells, but whether the change on cellulose affects the xyloglucan structure besides its abundance has not been analyzed. Fragmentation analysis with xyloglucan-specific endoglucanase （XEG） and endocellulase revealed that habituation to DCB caused a change in the fine structure of xyloglucan, namely a decrease in fucosyl residues attached to the galactosyl-xylosyl residues along the glucan backbone. After the removal of herbicide from the medium （dehabituated cells）, xyloglucan recovered its fucosyl residues. In addition, some cello-oligosaccharides could be detected only in habituated cells＇ xyloglucan digested by XEG and endocellulase, corresponding to a glucan co- valently bound or co-precipitated with the hemicelluloses. These results show that structural flexibility of cell walls relies in part on the plasticity of xyloglucan composition and opens up new perspectives to further research in this field.展开更多
以预处理后的大豆乳清废液为原料,采用模拟移动色谱分离系统对大豆低聚糖进行纯化。以大豆低聚糖纯度和回收率为指标,对进料量、进料流速、解吸流速、循环量流速等技术参数进行优化,结果表明,在进料量15%,进样流速5 m L/min,切换时间720...以预处理后的大豆乳清废液为原料,采用模拟移动色谱分离系统对大豆低聚糖进行纯化。以大豆低聚糖纯度和回收率为指标,对进料量、进料流速、解吸流速、循环量流速等技术参数进行优化,结果表明,在进料量15%,进样流速5 m L/min,切换时间720 s,解吸流速10 m L/min,循环量流速13 m L/min条件下,获得的大豆低聚糖纯度为89%,收率在89%以上。展开更多
文摘Bean cells that have been habituated to grow in a lethal concentration （12 μM） of 2,6-dichlorobenzonitrile （dichlobenil or DCB, a cellulose biosynthesis inhibitor） are known to have decreased cellulose content in their cell walls. Xyloglucan, which is bound to cellulose and together with it forms the main loading network of plant cell walls, has also been described to decrease in habituated cells, but whether the change on cellulose affects the xyloglucan structure besides its abundance has not been analyzed. Fragmentation analysis with xyloglucan-specific endoglucanase （XEG） and endocellulase revealed that habituation to DCB caused a change in the fine structure of xyloglucan, namely a decrease in fucosyl residues attached to the galactosyl-xylosyl residues along the glucan backbone. After the removal of herbicide from the medium （dehabituated cells）, xyloglucan recovered its fucosyl residues. In addition, some cello-oligosaccharides could be detected only in habituated cells＇ xyloglucan digested by XEG and endocellulase, corresponding to a glucan co- valently bound or co-precipitated with the hemicelluloses. These results show that structural flexibility of cell walls relies in part on the plasticity of xyloglucan composition and opens up new perspectives to further research in this field.
文摘以预处理后的大豆乳清废液为原料,采用模拟移动色谱分离系统对大豆低聚糖进行纯化。以大豆低聚糖纯度和回收率为指标,对进料量、进料流速、解吸流速、循环量流速等技术参数进行优化,结果表明,在进料量15%,进样流速5 m L/min,切换时间720 s,解吸流速10 m L/min,循环量流速13 m L/min条件下,获得的大豆低聚糖纯度为89%,收率在89%以上。
