Essays about: "C18"

Showing result 1 - 5 of 31 essays containing the word C18.

  1. 1. Investigation of Adsorption and Retention of Charged Compounds In RPLC

    University essay from Karlstads universitet/Institutionen för ingenjörs- och kemivetenskaper (from 2013)

    Author : Emma Fryxelius; [2022]
    Keywords : adsorption; adsorption isotherm; charged compounds; promethazine hydrochloride; propranolol hydrochloride; mixed-mode; retention; RPLC;

    Abstract : The adsorption isotherm of two weak bases, Promethazine hydrochloride and Propranolol hydrochloride, were determined with isocratic reversed-phase liquid chromatography, with a 60 w% methanol in 20 mM sodium acetate buffer pH 4 as the mobile phase, and calculated by the elution by characteristic points method. The data obtained from the method were then fitted into the Langmuir isotherm and the electrostatically modified Langmuir. READ MORE

  3. 2. A study of the adsorption isotherms of Ion-pair reagents

    University essay from Karlstads universitet

    Author : Mehmet Bilici; [2022]
    Keywords : Tributylamine; adsorption isotherm; liquid-liquid extraction; gas chromatography;

    Abstract : In this project, the optimization of obtaining adsorption isotherms for the ion pair reagent, tributylamine was tested. The goal was to have a better understanding of the chromatographic process when separating biomolecules, such as oligonucleotides. READ MORE

  4. 3. Quality parameters and protein profile in raw milk from individual cows with different lactation number and breed

    University essay from SLU/Department of Molecular Sciences

    Author : Jennifer Hallqvist; [2022]
    Keywords : Raw milk quality; protein profile; actation number; Swedish Red; Swedish Holstein;

    Abstract : Swedish dairy cows have an average life expectancy of 5 years, which means that each cow undergoes about 2.5 lactation cycles through her life. Reasons for culling dairy cows are mainly impaired fertility, udder health (mastitis) and low milk yield. READ MORE

  5. 4. Extraction efficiency of four pesticides using the QuEChERS extraction method and analysis by HPLC/DAD

    University essay from Lunds universitet/Kemiska institutionen

    Author : Honia Rasul; [2022]
    Keywords : analytical chemistry; pesticides; QuEChERS; soil; Chemistry;

    Abstract : A cleanup step is essential from an analytical perspective, to improve the chance of quantification and to minimize interference. Pesticides in soil are a necessity is agriculture for survival of crops and protection from unwanted growth and pests. READ MORE

  6. 5. Analytical Methods for High Molecular Weight UV Stabilizers

    University essay from KTH/Kemi

    Author : Elin Ljungström; [2022]
    Keywords : hindered amine light stabilizers; light stabilizers; polyolefins; LC-MS; HPLC; hindrade aminljusstabilisatorer; ljusstabilisatorer; polyolefiner; LC-MS; HPLC;

    Abstract : Utomhusprodukter gjorda i plast är sårbara för nedbrytning på grund av UV-energi från solljus. För att stoppa denna fotonedbrytning används UV-stabilisatorer i plastmaterial; en av huvudkategorierna är hindrade aminljusstabilisatorer (HALS, hindered amine light stabilizers). READ MORE