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eng A headspace-gas chromatography method for isopropanol determination in warfarin sodium products as a measure of drug crystallinity
RAHMAN, ZIYAUR; AKHTAR, SOHAIL; SIDDIQUI, AKHTAR; CIAVARELLA, ANTHONY B.; NGUYENPHO, AGNES; FAUSTINO, PATRICK J.; KHAN, MANSOOR A.
Acta Pharmaceutica Vol. 68, No. 1, 2018
Coumadin® and several generic products of warfarin sodium (WS) contain the crystalline form (clathrate) in which WS and isopropanol (IPA) are associated in a 2:1 molar ratio. IPA is critical in maintaining the WS crystalline structure. Physicochemical properties of the drug and drug product may change when the crystalline drug transforms to amorphous form. A headspace-gas chromatography (HS-GC) method was developed and validated for IPA determination in the WS drug product. n-propanol (NPA) was used as internal standard and the method was valid...
Hrčak ID: 192735


eng A short review of headspace extraction and ultrasonic solvent extraction for honey volatiles fingerprinting
Jerković, I.; Marijanović, Z.
Honey volatiles exhibit a potential role in distinguishing honeys as a function of botanical origin, but heating of honey generates artefacts such as compounds of Strecker degradation and Maillard reaction products. This short review is focused on the most recently applied methods for honey volatiles fingerprinting (without generation of thermal artefacts): headspace extraction (dynamic headspace extraction (DHE), headspace solid-phase microextraction (HS-SPME)) and ultrasonic solvent extraction (USE). These methods display a varying degree of...
Hrčak ID: 53251


eng Gas extraction from insulation liquids - Part III
Grisaru, Marius
Transformers Magazine Vol. 9, No. SE1, 2022
Although the headspace extraction method is the most widespread extraction methodology today, it has many commercial advantages for both test providers and users, and it is the most sensitive technique regarding the chemical and physical properties of the mixture. This technique was developed about 30 years ago when the oil type was mainly naphthenic. Nowadays, the number of available oil types has highly increased even in the mineral oil group. Of course, non-mineral oils are composed of completely different atoms and species and their formula...
Hrčak ID: 277832


eng Volatile Organic Compounds of Marine Sponge Petrosia ficiformis from the Adriatic Sea
Radman, Sanja; Maras, Elena; Jerković, Igor
Croatica Chemica Acta Vol. 94, No. 4, 2021
Volatile organic compounds (VOCs) of Petrosia ficiformis were investigated for the first time. The VOCs from fresh and air-dried sponge were obtained by hydrodistillation and headspace-solid phase microextraction and they were analysed by coupled gas chromatography-mass spectrometry. Aliphatic compounds with octan-3-one (up to 24.02 %), oct-1-en-3-ol (up to 8.65 %) and heptadecane (up to 39.37 %) were the most abundant in the fresh sponge along with benzaldehyde (up to 18.59 %) and diisobutyl phthalate (up to 8.44 %). Higher percentage of N,N...
Hrčak ID: 281136


hrv BioProspecting Jadranskog mora: Pregled dosadašnjih istraživanja isparljivih organskih spojeva
eng BioProspecting of the Adriatic Sea: A Review of Recent Studies of Volatile Organic Compounds
Kranjac, Marina; Zekić, Marina; Radonić, Ani; Marijanović, Zvonimir; Jokić, Stela; Jerković, Igor
Kemija u industriji Vol. 69, No. 9-10 (special issue), 2020
Istraživanja predstavljena u ovom preglednom radu doprinose poznavanju isparljivih organskih spojeva iz morskih organizama, posebno iz makroalgi Jadranskog mora. Za izolaciju isparljivih spojeva iz svježih i/ili na zraku osušenih uzoraka primijenjene su komplementarne metode: mikroekstrakcija vršnih para na čvrstoj fazi (HS-SPME) i/ili hidrodestilacija (HD). Dobiveni izolati analizirani su vezanim sustavom plinske kromatografije-spektrometrije masa (GC-MS). U vršnim parama i isparljivim uljima makroalgi <i>Halopteris filicina</i>, <i>Flabellia...
Hrčak ID: 243914


hrv Primjena mikroekstrakcije vršnih para na čvrstoj fazi kao preparativni pristup za plinsku kromatografiju sa spektrometrijom masa
eng The Application of Headspace Solid-phase Microextraction as a Preparation Approach for Gas Chromatography with Mass Spectrometry
Jerković, Igor; Marijanović, Zvonimir; Radonić, Ani; Zekić, Marina; Kranjac, Marina
Kemija u industriji Vol. 69, No. 9-10 (special issue), 2020
Ukratko su prikazani odabrani rezultati primjene mikroekstrakcije vršnih para na čvrstoj fazi kao preparativnog pristupa plinskoj kromatografiji – spektrometriji masa (HS-SPME/GC-MS) za istraživanje prirodnih spojeva, koje je provedeno na Kemijsko-tehnološkom fakultetu Sveučilištu u Splitu. Velika raznolikost spojeva vršnih para istražena je iz različitih prirodnih izvora: niži alifatski spojevi (npr. C<sub>5</sub>- i C<sub>6</sub>-spojevi), aromatski spojevi, monoterpeni (npr. derivati linaloola (oksidi, anhidro-oksidi, epoksidi), hotrienol),...
Hrčak ID: 243912