半纤维素

结果表明：（1）料液比1∶10,60℃浸提3h，米糠水溶性半纤维素提取率138%；

The optimal parameters were as follows : for water hemicellulose of rice bran : rice bran solvent ratio 1 ∶ 10 , at 60 ℃ for 3h , extraction rates 1.38 % ;

DTG曲线中有三个不同的峰，第一个是失水峰，第二个是半纤维素热解形成的肩状侧峰，第三个是由纤维素热解形成的热解主峰。

Moisture loss peak , the shoulder side peak formed by the hemicellulose pyrolysis , and the sharp main peak formed by cellulose pyrolysis are the three different peaks in the DTG curve .

可溶性米糠半纤维素B功能饮料的研制

Research and Manufacture of a Soluble Hemicellulose B Drink from Rice Bran

米糠半纤维素B的分离和鉴定

Isolation and Identification of Rice Bran Hemicellulose B

以新鲜米糠为原料，开发研制出可溶性米糠半纤维素B饮料。

A soluble hemicellulose B drink was developed from fresh rice bran as raw material .

采用X射线衍射分析和原子力显微镜研究半纤维素含量的变化对再生植物纤维的超分子结构及其成纸性能的影响。

The effect of hemicellulose content on the supramolecular structure and paper properties of second fiber was studied by X-ray diffraction and AFM .

DSC的结果说明柿叶的玻璃化温度约为182.92℃左右，高于纤维素和半纤维素。

The vitrification point is about 182.92 ℃, higher than that of the cellulose or semi cellulose .

FTIR光谱分析和化学分析结果表明，经碱处理的纤维中半纤维素含量降低；

The FTIR and chemical analyses indicated lowering of hemi-cellulose content by alkali treatment of the fibers .

结果表明，菌株B1对竹基质中木质素和半纤维素有明显的降解选择性。

The results indicated that strain B1 has apparent degradation selectivity for hemicellulose and lignin .

通过SEM观察，半纤维素呈现絮状或块状形态，与提取方法无关。

From SEM observations , the hemicellulose could present as sponge or solid piece structure , and that had nothing to do with the extraction method .

ATR图谱分析表明，过氧乙酸-过碳酸钠脱胶的精干麻中半纤维素和木质素等胶质的含量都进一步得到降低。

ATR analysis showed that the content of hemicellulose and lignin had been further reduced .

结果表明，与硫酸盐浆（KP）相比，碱性&亚钠法浆（ASP）中残余木素含有较少的缩合型结构以及木素与半纤维素的连接；

Results showed that the condensed structure and the connection between lignin and semi-cellulose in ASP were less than those in KP .

采用热重分析法（TGA）研究不同分离方法提取的半纤维素组分热分解规律。

Thermal decomposition characteristics of hemicelluloses extracted with different methods were analyzed by the thermal gravimetric analysis ( TGA ) method .

另外，经FTIR证实，铜与木材作用时，主要是半纤维素中的羧基团和木质素中的酚羟基及芳基酯基与铜成键。

The carboxylic groups in hemicellulose and the phenolic hydroxyl and ester groups in lignin are the major bonding sites for copper , as confirmed by FTIR .

不同来源纤维，由于其所含的NDF和半纤维素的含量不同，所以鹅对其利用情况也不同。

Due to different contents of NDF and hemicellulose in different fiber resources , they were utilized by geese differently .

ATR图谱分析表明，过碳酸钠脱胶后精干麻中的胶质基本去除，但精干麻中还含有半纤维素和木质素。

ATR analysis showed that the gum was removed after the sodium carbonate degumming . But the degummed ramie fiber contained hemicellulose and lignin .

通过X一射线衍射分析表明，爆破使纤维素的相对结晶度增大，而绝对结晶度下降，说明经过预蒸煮和爆破处理使半纤维素部分降解。

The X-ray diffraction spectrum analysis showed that the relative crystallinity of cellulose treated by explosion was increased , while the absolute crystallinity was decreased . The reasons for these could be that hemicellulose was degraded partially after explosion .

半纤维素是仅次于纤维素含量第二丰富的可利用自然资源，其主要成分是木聚糖（xylan）。

Second only to cellulose in natural abundance , xylan is a major component of hemicellulose fraction of the plant cell walls .

GPC检测结果表明，改性后半纤维素分子质量比未改性的半纤维素分子质量低，证明半纤维素在化学反应中发生了降解。

The molecular weight of the modified hemicelluloses is lower than that of the native hemicelluloses , which is illustrated that the hemicellulose is degraded in the reaction .

不同提取方法所得半纤维素TG-DTG曲线特征非常相似。

The characteristics of the TG-DTG curves obtained for the hemicellulose derived from three extraction methods were very similar .

干旱胁迫导致胡萝卜品质发生变化，心柱所占比例、可溶性固形物、纤维素和半纤维素含量随着干旱胁迫程度加强而增大，B-胡萝卜素和和维生素C含量则表现为下降，食用价值下降。

Water stress led to change the qualities of carrot , size of xylem , soluble solids , cellulose and hemicellulose when the extent of water stress increased , but content of B-carotene , vitamin C is showed to drop , edible value was decresed . 5 .

同时也研究了白水中的DCS物质，包括无机盐、半纤维素和木素对纸页强度和光学性能的影响，并采用Tappi标准抄片器模拟来说明白水封闭循环对纸页性能的影响。

The effects of the closed white water on paper strength and optical properties have been also studies in this part .

碱溶性半纤维素最佳提取工艺参数为，料液比为1∶10、4h、25℃、碱液浓度为1.0N。

For alkaline-hemicellulose extraction , the parameters were as follows : meal-solvent ratio 1 ∶ 10 , extraction time 4 hours , temperature 25 ℃, alkaline concentration 1.0 N.

半纤维素含量在处理时间为1h时，随着处理温度的升高，表现为下降的趋势。当处理时间为3h时，表现为上升的趋势。

The content of Hemicelluloses has shown a downward trend with increasing temperature when the processing time is 1h . When the processing time is 3h , the performance for the upward trend .

TG-FTIR分析表明，半纤维素的大量分解是稻壳理化特性变化的主要原因。

The results of TG-FTIR indicated that the change of physicochemical property of rice husk was mainly owed to the decomposition of the hemicellulose .

爆破工艺条件对爆破浆的纤维素、半纤维素和木素含量均有一定的影响，且NaOH用量和爆破压力是主要影响因素。

There were some influences on the cellulose , hemicellulose and lignin content of explosion pulp by the explosion parameter . It also showed that parameter of NaOH charge and explosion pressure were the main influencing factors . 3 .

FT-IR和TG-DTA分析结果表明H2O2和O2不会引起半纤维素结构上明显的化学改变，木质素和碳水化合物的降解程度可能有所差异。

The results of FT-IR and TG-DTA analysis show that H2O2 and O2 can not cause obvious chemical change in the structure of hemicellulose . Also , the degree of degration of lignin and carbohydrate may be different .

这个结果表明，白腐菌Cyathusstercoreus对芦苇中的纤维素，半纤维素和木质素均有不同程度的降解能力，且对纤维素和半纤维素的降解要高于对木素的降解。

This means the degradation by Cyathus stercoreus of cellulose and semi-cellulose in the reed is higher than that of lignin .

根据GC-MS分析，亚、超临界醇解产物的组成很复杂，可检测出数十种化合物，主要是糠醛（纤维素和半纤维素的主要醇解产物）、含氧有机物、含苯环化合物和杂环化合物。

Dozens of organic compounds were detected by GC-MS analysis from supercritical alcoholysis products , and most of the species detected are furfural which is the main product of the cellulose and the hemicellulose and oxygen-containing organic chemicals , especially the methoxy compounds .

另外，伴随酶解的进行，酶解作用使得纤维微晶体尺寸逐渐减小。这说明杨木SGW浆酶改性主要发生在纤维表面的半纤维素存在区域和纤维素的无定形区域。

This increase indicated that the complex cellulases readily attacked the more accessible amorphous region of cellulose and the location of hemicellulose on the surface of the fibers .