𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Preparative isolation and characterization of zinc dialkyldithiophosphates from commercial antiwear additives

✍ Scribed by Lante Carbognani

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
704 KB
Volume
26
Category
Article
ISSN
1615-9306

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

An automated HPLC separation methodology was developed for the preparative separation of ZnDTP components from commercial lubricant antiwear additives. Using silica columns that can be reactivated by elution with appropriate solvents, gram quantities of additives can be isolated. The isolated materials are useful for carrying out further mechanistic and synthetic studies. Preliminary estimations suggest that separation repeatability and fraction recoveries have acceptable levels. Qualitative characterization of isolated ZnDTP mixtures was achieved by IR, TLC‐FID, and RP‐HPLC. IR is useful for assessing the nature of ZnDTP alcoholic moieties. TLC‐FID provides a check on the preparative HPLC separation efficiency. RP‐HPLC on octadecylsil‐silica columns provides fingerprints for isolated commercial ZnDTP active concentrates. Fingerprinting on small bore HPLC columns proved advantageous compared with conventional columns.

📜 SIMILAR VOLUMES

Isolation and characterization of a prot
Isolation and characterization of a protease inhibitor from commercial stem bromelain acetone powder
✍ Perlstein, Seymour H. ;Kéazdy, Ferenc J. 📂 Article 📅 1973 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 288 KB

## Abstract Seven closely related protease inhibitors were isolated from commercial bromelain acetone powder in electrophoretically pure form by gel filtration on Sephadex G‐75, followed by ion exchange chromatography on DEAE Sephadex at pH 7.55. The inhibitors are proteins of MW 5000‐6000, which i

Preparative isolation and characterizati
Preparative isolation and characterization of heavy metal complexes from acid mine drainage and surface wastewater
✍ Wengel, Marcus ;Gleixner, Gerd 📂 Article 📅 2006 🏛 John Wiley and Sons 🌐 English ⚖ 650 KB

## Abstract A preparative method was developed to sample dissolved organic carbon (DOC) and heavy metals (Ni, Mn) from polluted surface waters. Main focus was set on the preparative production of freeze‐dried samples mainly composed of organic ligands from heavy metal complexes. First characterizat