NUCLEODUR--新一代對(duì)稱的硅球
NUCLEODUR 是采用合成，并在嚴(yán)格工藝控制下生產(chǎn)的硅球。使它具有近乎的球型表面。從下圖中可以看到NUCLEODUR 的硅球表面十分光滑對(duì)稱和均勻的粒度大小分布。

研究表明液相色譜硅球中除了硅醇基活性基團(tuán)外，金屬雜質(zhì)，如鐵，鈉等的存在，同樣會(huì)與被測(cè)樣品中的胺和酚類化合物產(chǎn)生吸附，影響分析結(jié)果。

NUCLEODUR 不但嚴(yán)格控制硅球表面的硅醇基團(tuán)，還特別成功地消除了硅球內(nèi)的金屬雜質(zhì)。

右表是使用AAS（原子吸收）方法檢測(cè)NUCLEODUR 100A-5um 規(guī)格的硅球，顯示其金屬雜質(zhì)含量極低。

Summary of available NUCLEODUR® phases

Phase

Modification

% C

pH range

Particle sizes [μm]

USP

Structure

C18 Gravity

octadecyl, high density coating, multi-endcapping

18

1–11

1.8 · 3 · 5

L1

C8 Gravity

octyl, high density coating, multi-endcapping

11

1–11

1.8 · 5

L7

C18 Isis

octadecyl, specially cross-linked modification, endcapped

20

1–10

1.8 · 3 · 5

L1

C18 Pyramid

octadecyl with polar endcapping

14

1–9

1.8 · 3 · 5

L1

PolarTec

octadecyl with embedded polar group

17

1–9

1.8 · 3 · 5

L1 L60

Phenyl-Hexyl

special phenylhexyl phase

10

1–10

1.8 · 3 · 5

L11

PFP

pentafluorophenyl-propyl with multi-endcapping

8

1–9

1.8 · 3 · 5

L43

Sphinx RP

bifunctional, balanced ratio of propylphenyl and octadecyl, endcapping

15

1–10

1.8 · 3 · 5

L1 L11

C18 HTec

octadecyl, high density coating, high capacity, multi-endcapping

18

1–11

1.8 · 3 · 5
7 · 10

L1

C18 ec

octadecyl, medium density, endcapping

17.5

1–9

3 · 5
ａnd larger

L1

C8 ec

octyl, medium density, endcapping

10.5

1–9

3 · 5

L7

HILIC

ammonium – sulfonic acid

7

2–8.5

1.8 · 3 · 5

CN/CN-RP

cyano (nitrile) for NP and RP separations

7

1–8

3 · 5

L10

NH2/NH2-RP

aminopropyl for NP and RP separations

2.5

2–8

3 · 5

L8

SiOH

unmodified NUCLEODUR®

–

2–8

3 · 5
ａnd larger

L3