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LC/MS Analysis of Phospholipids in Milk on Ascentis® Express HILIC after SPE using Supelclean Si, Shotgun HPLC Analysis

LC/MS Analysis of Phospholipids in Milk on Ascentis® Express HILIC after SPE using Supelclean™ Si, Shotgun HPLC Analysis application for HPLC

Materiais

coluna analítica

Nº do produto
Descrição
Preços

Ascentis® Express HILIC, 2.7 μm HPLC Column

2.7 μm particle size, L × I.D. 15 cm × 4.6 mm

padrão

Nº do produto
Descrição
Preços

L-α-Phosphatidyl-L-serine from Glycine max (soybean)

≥97%

Sphingomyelin

from chicken egg yolk, ≥95%

L-αfosfatidilcolina

egg yolk, Type XVI-E, ≥99% (TLC), lyophilized powder

L-α-Phosphatidylethanolamine from egg yolk

Type III, ≥97% (TLC), lyophilized powder

Phosphatidylinositol ammonium salt solution

from soybean, ≥98.0% (TLC)

tubo ou placa SPE

Nº do produto
Descrição
Preços

Supelclean LC-Si SPE Tube

bed wt. 1 g, volume 6 mL, pkg of 30 ea

CONDITIONS

sample/matrix

Phospholipids from 10 mL cow’s milk (Folch method extraction)

SPE tube/cartridge

Supelclean LC-Si, 1 g/6 mL (57051)

condition

hexane

sample addition

1 mL extract in chloroform/methanol (2:1, v/v)

washing

3 mL of hexane/diethylether (8:2, v/v) and 3 mL of hexane/diethylether (1:1, v/v) to remove nonpolar lipids

elution

1 x 4 mL methanol, followed by 1 x 2 mL methanol, followed by 1 x 2 mL chloroform/methanol/water (3:5:2, v/v/v).

eluate post-treatment

dry under a gentle stream of nitrogen, redissolved residue in chloroform/methanol (2:1, v/v)

column

Ascentis Express HILIC, 15 cm x 4.6 mm I.D., 2.7 μm particles (53981-U)

mobile phase

[A] acetonitrile; [B] acetonitrile:water (2:1)

gradient

0% B held for 5 min; to 30% B in 5 min; to 100% B in 20 min; held at 100% B for 10 min; to 0% B in 1 min

flow rate

0.7 mL/min

column temp.

ambient

detector

ELSD. nebulizing gas (nitrogen) flow: 2 mL/min (180 KPa); drift tube temperature: 50 °C

injection

5 μL

Descrição

Nota de análise

Extraction of the lipid fraction was carried out from 10 mL of the cow′s milk sample, according to the Folch method to ensure the exhaustive extraction of the whole lipid content. The total extract was evaporated under vacuum, and the final dry residue (400 mg) was re-dissolved in chloroform/methanol 2:1 (v/v). Lipid extract (100 mg) was afterward dissolved in 1 mL mixture of chloroform/methanol (2:1, v/v). After the cartridge has been conditioned with hexane, the non-polar lipids were eluted with 3 mL of hexane/diethyl-ether (8:2, v/v) and 3 mL of hexane/diethyl-ether (1:1, v/v). Recovery of PLs from the cartridge was obtained by two-step elution, using 4 mL of methanol as first extraction solvent, and subsequently 2 mL of methanol followed by 2 mL of chloroform/methanol/water (3:5:2, v/v/v). The recovered fraction was dried under a gentle stream of nitrogen, yielding 49.7 mg dry residue. The residue was finally re-dissolved in chloroform/methanol (2:1, v/v).

Informações legais

Ascentis is a registered trademark of Merck KGaA, Darmstadt, Germany
Supelclean is a trademark of Sigma-Aldrich Co. LLC