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Other Special Columns

Special columns are a central concern in our company. With an appropriate column you can solve nearly all separation tasks, not laboriously by high plate numbers, but simply by tailor made selectivities. l us your problem!

By the way, the following packings are only available from SEPSERV. They were mostly developed due to orders of customers. For reasons of discretion it is not possible in every case to name the separation problems worked on.

· UltraSep ES POLYOL, optically active as
a) UltraSep ES AMINOPOLYOL H
(Aminodesoxyhexitol)

b) UltraSep ES AMINOPOLYOL G
(Aminodesoxy-d-glucose)

· UltraSep ES AMINOTETRAOL

Alcoholic hydroxyls and amino groups on the surface of this packing are responsible for a blocking of residual silanols. This means, that polar compounds can be excellently separated by normal phase chromatography. Example: Stereoisomeric organic N-oxides. AMINOTETRAOL is a very versatile phase. In the pharmaceutical industry it is advantageously used also with aqueous and aqueous-organic eluents. One can use the phase to separate sugars and more. Furthermore, the packing works as a weak ion exchanger and separates with weak eluents, e. g., organic carbon acids at pH 3.

· UltraSep ES DTA (= Diethylenetriamine)
This packing is designated for special applications with amino packings. To this group belongs also UltraSep ES TTA

– CH₂ – NH – CH₂ – CH₂ – NH – CH₂ – CH₂ – NH₂

· UltraSep ES Tetraminool (TTA)
(= Triethylenetetramine)
This packing has in comparison with DTA a doubled spacer chain and three ethylene residues connected by nitrogen atoms. Beside the primary amino group at the end of the chain there exists an alcoholic hydroxyl group at the spacer.

– CH₂ – NH – (CH₂ – CH₂ – NH)₂– CH₂ – CH₂ – NH₂

· UltraSep ES RP8F (Fluorooctylsilica)
This packing is a fluorooctylsilica, where the H-atoms of each C-atom are substituted by 17 fluorine atoms. This packing is an alternative RP phase with relatively rigid strong hydrophobic chains for special applications.

– (CF₂)₇ – CF₃

· UltraSep ES PEO (Polyethyleneglycolsilica)
UltraSep ES PEO is a packing on the basis of polyethyleneoxide chains. Within the chain C2 segments alternate with oxygen atoms. In total there are 26 atoms within the chain, 18 of them are carbon atoms as it is the case in standard reversed phases. Their properties are levelled by the oxygen atoms and combined with interactions due to hydrogen bridges (OH^….O; NH^….O). Therefore the PEO packing can be used both for reversed phase chromatography and for normal phase chromatography (see application PEO1 and PEO2, respectively). With adequate compounds it exhibits specific selectivity effects as well as shorter retention times in comparison to RP18 materials.

– (CH₂– CH₂ – O)_6-9 – CH₂ – CH₂ – OCH₃

Application PEO1

Application PEO2

· UltraSep ES PFP
UltraSep ES PFP is a pentafluorophenylalkylsilica of the RP8 reversed phase type with outstanding properties. On average it yields the retention times of the RP18 packing type with the following characteristics:

	Compounds which are not separated enough by normal RP18 phases, potentially can be resolved sufficiently using the PFP packing (purity screening).
	PFP is very attractive for pharmaceutically relevant substances, especially for bases, which in principle show a small tailing (application PFP1 and PFP2). Base pairs which are not separated by normal RP packings, can be resolved (applicationPFP3).
	PFP packings behave significantly different in comparison to normal RP packings. For instance in the test mixture of toluene, propyl benzene and pentyl benzene with rising water content the peaks become slender. At a composition of the acetonitrile/water mixture of 1/1 125,000 theoretical plates per m are accomplished already with 4 µm material.
	PFP phases together with the normal RP phases and RP amid phases or also with PEO phases yield an advantageous “selectivity trio” and “selectivity quartet”, respectively.

Application PFP1

Application PFP2

Application PFP3

· UltraSep ES C30 (RP-packing)
With long C30 chains normal material (pore diameter of 120 Å) as well as material with large pores (pore diameter of 300 Å = D300) are offered.

– (CH₂)₂₉ – CH₃

Application

· UltraSep ES ADC (= Aminodicarboxy)
As active group aminodiacetic acid was bound over a spacer with 6 C atoms.

· UltraSep ES TC (= Triolcarboxy)
In this packing a carboxylic group was combined with a hydroxymethyl cluster having the basic ligand structure shown in the formula.

· UltraSep ES C12 TA (= Triamino)
This packing is strongly polar and possesses branched aliphatic chains containing two terminal primary amino groups and one secondary amino group.

· UltraSep ES C10 w-COOH
This is a medium polar packing with an unbranched aliphatic carbon chain and two carboxylic groups, one is terminal . It shows typical RP behaviour.

· UltraSep ES AMID RP18 500
This packing is a lowly charged methyloctadecylsilica gel with a specific selectivity.

Shield – Carrier (Embedded Groups) — RP packings with polar selectivity

[see GIT 46 (2002), number 1 . Please ask for a reprint.]

suitable

	for purely aqueous media (“Aq”) without phase collaps
	for the separation of highly polar compounds

· UltraSep ES AMID RP18A
3-(Octadecanoylamino)propylslilyl-Silica. The packing carries an amide group between spacer and RP chain (so called Embedded Group). Spec. area 280 m²/g.

Application

· UltraSep ES AMID RP18AM
The packing possesses additionally a methyl group at the silyl residue. Spec. area 420 m²/g.

· UltraSep ES AMID H RP18PA
3-(Heptadecylureido)-propylslilyl-Silica. The packing carries a urea group instead of the amide group.

Application1

Application2

· UltraSep ES CHAIR
UltraSep ES CHAIR is a special phase obtained by chemical bonding of a sufficiently long non polar chain to the silica. The chain bears one or two polar substituents at the first third or at the middle part.

The groups show a pronounced interaction with silanols. Therefore, depending on the chromatographic conditions for a unique chain folding, a chair like configuration can be expected ( figure).

It is well known, that normal phases with polar groups show RP-behaviour too. With chair phases, that dual behaviour was intentional, so to speak, typified. In this way we can synthesize tailor-made selectivities, changing the length of the non polar chain R or the nature and/or number (1 or 2) of the polar groups.

UltraSep ES CHAIR is often used, e. g. in the pharmaceutical industry and in biochemical institutions. Example: Cephalosporines.

UltraSep ES CHAIR structure (on principle)

P = Polar substituent (interaction with silanoles)

R = Alkyl chain with 2 – 12 carbon atoms

Application

· UltraSep ES UREIDO
Ureidopropylsilyl-silica. Normal phase with a urea group at the end of the propyl spacer

COLUMNS and PRICES (€)
	Column size (mm)
UltraSep ES	250 x 4 200 x 4	250 x 3 200 x 3	250 x 2 200 x 2	150 x 4 125 x 4	150 x 3 125 x 3	150 x 2 125 x 2	100 x 4 60 x 4	100 x 3 60 x 3	100 x 2 60 x 2
AMINOPOLYOL H	265.00	265.00	270.00	255.00	255.00	260.00	245.00	245.00	250.00
AMINOPOLYOL G	265.00	265.00	270.00	255.00	255.00	260.00	245.00	245.00	250.00
AMINOTETRAOL	250.00	250.00	255.00	240.00	240.00	245.00	225.00	225.00	235.00
DTA	290.00	290.00	290.00	265.00	265.00	270.00	255.00	255.00	260.00
Tetraminool (TTA)	290.00	290.00	290.00	265.00	265.00	270.00	255.00	255.00	260.00
RP8F	330.00	315.00	315.00	290.00	290.00	295.00	280.00	280.00	285.00
PEO	510.00	480.00	480.00	430.00	430.00	430.00	410.00	400.00	400.00
PFP	510.00	480.00	480.00	430.00	430.00	430.00	410.00	400.00	400.00
C30 or C30DM	395.00	395.00	395.00	365.00	365.00	365.00	355.00	355.00	355.00
D300 C30	480.00	480.00	480.00	445.00	445.00	445.00	435.00	435.00	435.00
ADC	265.00	265.00	270.00	255.00	255.00	260.00	245.00	245.00	250.00
TC	265.00	265.00	270.00	255.00	255.00	260.00	245.00	245.00	250.00
C12 TA	250.00	250.00	255.00	240.00	240.00	245.00	225.00	225.00	235.00
C10 w-COOH	290.00	290.00	290.00	265.00	265.00	270.00	255.00	255.00	260.00
RP18 500	270.00	265.00	265.00	240.00	235.00	235.00	210.00	210.00	215.00
AMID RP18A	340.00	335.00	335.00	305.00	300.00	300.00	285.00	285.00	290.00
AMID RP18AM	340.00	335.00	335.00	305.00	300.00	300.00	285.00	285.00	290.00
AMID H RP18PA	270.00	265.00	265.00	240.00	235.00	235.00	210.00	210.00	215.00
AMID H RP18P	270.00	265.00	265.00	240.00	235.00	235.00	210.00	210.00	215.00
CHAIR	240.00	240.00	245.00	235.00	225.00	235.00	215.00	215.00	220.00
UREIDO	210.00	210.00	210.00	210.00	200.00	200.00	200.00	200.00	200.00
Phenylhexyl	390.00	380.00	395.00	370.00	360.00	375.00	335.00	325.00	340.00
	Size (mm)
	10 x 4	10 x 3	10 x 2
Precolumn cartridges (Price per pack = 5 pieces)	170.00	170.00	170.00