Similarly, for fraction II (Fig. 3B), three consecutive1,4A-ions (1,4A2+Na at m/z 417,1,4A3+Na at m/z 563 and1,4A4+Na at m/z 709) demonstrated that all the glycosidic linkages are 3-linked.
The glycosidic fragment ions (B2+Na at m/z 473, C2+Na at m/z 491, B3+Na at m/z 619 and C3+Na at m/z 637) reflected the existence of two linked nonsulphated fucose residues, but the positions of the two sulphate groups are still ambiguous. For fraction III (Fig. 3C),1,4A-ions(1,4A2+Na at m/z 417,1,4A3at m/z 563,1,4A4+Na at m/z 709, and1,4A7+2Na at m/z 664)were found which suggested that fucose residues in fraction III are 3-linked. The glycosidic fragment ions(B6+2Na at m/z 628, B5+Na at m/z 911, and C5+Na at m/z 929)confirmed that a nonsulphated fucose residue exists at one terminal and that a disulsphated fucose residue is linked to it. The glycosidic fragment ions (B2+Na/C2+Na at m/z 473/491, B3+Na/C3+Na at m/z 619/637, and B4+Na/C4+Na at m/z 765/783) indicated the other two sulphate groups might exist at two fucose residues on the other terminal. The ions of fraction IV produced (Fig. 3D) were identical to those of fraction III, except for a glycosidic fragment ion (B7+ 2Na at m/z
692). This indicates that fraction IV consists of fraction III and a terminal nonsulphated fucose residue. ESI–CID–MS/MS provided critical information for the structural determination of the oligosaccharides, such as the nature of the glycosidic linkage, the partial sequence and the position of the sulphated residue. However, the NMR experiment was still necessary
in order to uncover the definitive structure
同样,对于组分 ⅱ (图 3B),三个 consecutive1、 4A 离子 (1,4A2 + m/z 417,1、 4A3 + m/z 563 和 1、 4A4 + m/z 709 Na Na Na) 表明所有糖苷 3 链接。糖苷片段离子 (m/z 473 B2 + 钠、 C2 + Na 在 m/z 491、 B3 + Na 在 m/z 619 和 C3 + Na 在 m/z 637) 反映的两个链接的 nonsulphated 岩藻糖残基,存在两种硫酸集团的立场却仍然含糊不清。只是小部分 III (图 3),1,4A ions(1,4A2+Na at m/z 417,1,4A3at m/z 563,1,4A4+Na at m/z 709, and1,4A7+2Na at m/z 664) 被发现的建议中分数三岩藻糖残留量是 3 链接。糖苷片段离子 (B6 + 2Na m/z 628,m/z 911,B5 + 钠和 C5 + 钠在 m/z 929) 牢固性 nonsulphated 岩藻糖渣存在一个码头和一个 disulsphated 岩藻糖残留物链接到它。糖苷碎片离子 (B2 + 钠 / C2 + Na 在 m/z 473/491、 B3 + 钠 / C3 + Na 在 m/z 619/637 和 B4 + 钠 / C4 + Na 在 m/z 765/783) 表示其他两种硫酸群体可能存在于其他终端上的两个岩藻糖残基。分数第四产生 (图 3D) 离子含量相同的分数 III,除了糖苷片段离子 (B7 + 2Na m/z692).这表明分数四组成分数 III 和终端 nonsulphated 岩藻糖残渣。ESI — — CID — — MS 提供关键信息以低聚糖,例如糖苷键、 硫酸盐残留量的位置及部分序列的性质结构测定。然而,核磁共振实验是仍有必要为了揭露 definitive 结构
正在翻譯中..
![](//zhcntimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)
同样,对组分II(图3b),三consecutive1,4a-ions(1,4a2 Na m/z 417,1,4a3 Na在m/z 563 and1,4a4 Na m/z 709)表明所有的糖苷键是3。
糖苷碎片离子(B2 Na在m/z 473,m/z 491 C2 Na B3,Na在m/z 619和m/z 637 C3 NA)反映两存在联系nonsulphated岩藻糖残基,但两硫酸基团位置尚不明确。对于组分III(图3C),1,4a-ions(1,4a2 Na m/z 417,1,4a3at m/z 563,1,4a4 Na在m/z 709,and1,4a7 2Na m/z 664)发现提示第三岩藻糖基杆。糖苷(B6 2Na碎片离子m/z 628,m/z 911 B5 Na,和C5娜在m/z 929)CONfi出现在一个终端和一个disulsphated岩藻糖残基连接到它存在一个nonsulphated岩藻糖残基。糖苷的碎片离子(Na Na / B2 C2 m/z 473 / 491,B3 C3 NA NA / m / z为619 / 637,Na Na / C4和B4 m/z 765 / 783)表示,其他两组可能在两硫酸岩藻糖残基的另端存在。离子组分IV(图3d)产生了这些分数III相同,除了一个糖苷碎片离子(m/z
B7 2Na 692)。这表明,部分IV由分数III和终端nonsulphated岩藻糖残基。–CID–ESI MS / MS的寡糖结构分析提供了重要的信息,如糖苷键的性质,部分序列和硫酸渣的位置。然而,还是核磁共振实验是为了必要的
揭开defi认知结构
正在翻譯中..
![](//zhcntimg.ilovetranslation.com/pic/loading_3.gif?v=b9814dd30c1d7c59_8619)