✦ LIBER ✦

Fast Determination of Vitamin A Palmitate in Margarines by HPLC

✍ Scribed by Aitzetmüller, K. ;Pilz, J. ;Tasche, R.

Publisher: John Wiley and Sons
Year: 1979
Weight: 489 KB
Volume: 81
Category: Article
ISSN: 0931-5985
DOI: 10.1002/lipi.19790810107

No coin nor oath required. For personal study only.

✦ Synopsis

folgt anhand (tiefer und hoher) benachbartertaglich neu zu ermittelnder -Standardvergleichsextinktionen aus dem Bereich 50-300 IED,/ml Standard-MeBlosung und der Extinktion des Reagentienblindwertes. Die Wiederfindungsrate (Recovery) betrug 75.5 O h . 2. Bestimmung von Gesamt-, freiem und vereJtertem D, (Ausfrierverfnhren) 2.1. Extraktion 2 g Lebertran, auf 1 mg genau gewogen, werden in 50 ml Ascorbylpalmitat-haltigem Aceton gelost und 10 Minuten bei -80° C im Aceton/Trockeneis-Bad (Dewar-gefai3) ausgefroren. Nach Absaugen auf einer auf -70 bis 80° C tiefgekiihlten Gs-Tiefkiihlfritte wird das Fettkristallisat nochmals in gleicher Weise gelost, zum Ausfrieren gebracht, abgesaugt und mit 3 ma1 10 ml tiefgekuhltem Aceton nachgewaschen. Es ist -wie Testverseifungen zeigtenpraktisch D,-frei und wird verworfen (ca. 70°/o der Einwaage). Die vereinigten Aceton-Extrakte enthalten das freie und das veresterte Vitamin D, (Summe = Gesamt-Vitamin 0%); nach Entfernen des Acetons i. Vak. wird der Extraktriickstand in wenig Petroleumbenzin I1 aufgenommen.

📜 SIMILAR VOLUMES

Determination of vitamins A-palmitate, A

Determination of vitamins A-palmitate, A-acetate, E-acetate, D3 and K1 in vitamin mix by isocratic reverse phase HPLC

✍ Stary, E. ;Cruz, A. M. C. ;Donomai, C. A. ;Monfardini, J. L. ;Vargas, J. T. F. 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 265 KB 👁 1 views

HPLC determination of vitamin A and vita

HPLC determination of vitamin A and vitamin D2 in South Pacific root crops

✍ U Singh; J H Bradbury 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 446 KB 👁 1 views

Determination of vitamin A, vitamin E, a

Determination of vitamin A, vitamin E, and their esters in tablet preparations using supercritical fluid extraction and HPLC

✍ Santo Scalia; Giuseppe Ruberto; Francesco Bonina 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 481 KB 👁 1 views

Determination of Broxaterol in Plasma by

Determination of Broxaterol in Plasma by Coupled HPLC-GC

✍ Gianesello, V. ;Bolzani, L. ;Brenn, E. ;Gazzaniga, A. 📂 Article 📅 1988 🏛 John Wiley and Sons 🌐 English ⚖ 284 KB 👁 1 views

For the analysis of broxaterol 1 -(3-bromoisoxazol-5-yl)-2-(tert-buty1amino)ethanol in human plasma and urine an on-line HPLC-GC apparatus was used applying the "concurrent solvent evaporation'' technique described in previous studies. Broxaterol is quantitatively determined by capillary GC with ECD

Determination of extractable methylene d

Determination of extractable methylene dianiline in thermoplastic polyurethanes by HPLC

✍ Mazzu, A. L. ;Smith, C. P. 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 377 KB

Polyurethanes are finding increasing utilization in biomedical applications. Recently, the reported finding of methylene dianiline (4,4'-diaminodiphenylmethane, MDA) in the aqueous extracts of autoclaved 4,4'-diphenylmethane diisocyanatebased polyurethanes promoted our investigation of the origin an

Determination of trans -Resveratrol Conc

Determination of trans -Resveratrol Concentrations in Brazilian Red Wines by HPLC

✍ André A. Souto; Manuel C. Carneiro; Marcus Seferin; Marcos J.H. Senna; Andressa 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 191 KB

The levels of trans-resveratrol in 36 commercial red wines produced in the southern region of Brazil have been measured using a direct injection isocratic UV-HPLC method. The concentration of trans-resveratrol ranged from 0.82 to 5.75 mg/L with a mean value of 2.57 mg/L (R.S.D.%"1.99).