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eng Stabilization of Empty Fruit Bunch derived Bio-oil using Solvents
Yiin, Chung Loong; Yusup, Suzana; Mohamed, Mustakimah; Udomsap, Parncheewa; Yoosuk, Boonyawan; Sukkasi, Sittha
The intention of this research was to select the ideal condition for accelerated aging of bio-oil and the consequences of additive in stabilizing the bio-oil. The bio-oil was produced from the catalytic pyrolysis of empty fruit bunch. The optimum reaction conditions applied to obtain the utmost bio-oil yield were 5 wt% of H-Y catalyst at reaction temperature of 500 °C and nitrogen flow rate of 100 ml/min. A 10 wt% of solvents including acetone, ethanol, and ethyl acetate were used to study the bio-oil’s stability. All the test samples were subj...
Hrčak ID: 150408


eng Characterization of Summer Savory (Satureja hortensis L.) Honey by Physico-Chemical Parameters and Chromatographic / Spectroscopic Techniques (GC-FID/MS, HPLC-DAD, UV/VIS and FTIR-ATR)
Jerković, Igor; Tuberoso, Carlo Ignazio Giovanni; Baranović, Goran; Marijanović, Zvonimir; Kranjac, Marina; Svečnjak, Lidija; Kuś, Piotr Marek
Croatica Chemica Acta Vol. 88, No. 1, 2015
Satureja hortensis L. unifloral honey was characterized by pollen analysis, electrical conductivity, pH and extensively by chromatographic and spectroscopic techniques. UV / VIS spectro-scopy measurements revealed total phenol content of 682.1 mg GAE / kg by Folin-Ciocalteu assay, antiox-idant capacity by DPPH assay of 1.7 mmol TEAC / kg and by FRAP assay of 4.3 mmol Fe2+ / kg as well as CIE L*a*b*Cab*h°ab chromaticity coordinates. GC-MS after headspace solid-phase microextraction (HS-SPME) revealed hotrienol (22.8 %) along with other linalool...
Hrčak ID: 139125


eng Carbohydrate Composition of Endotoxins from R-type Isogenic Mutants of Shigella sonnei Studied by Capillary Electrophoresis and GC-MS
Bui, Annamária; Kilár, Anikó; Dörnyei, Ágnes; Poór, Viktória; Kovács, Krisztina; Kocsis, Béla; Kilár, Ferenc
Croatica Chemica Acta Vol. 84, No. 3, 2011
The carbohydrate composition of the rough-type endotoxins (lipopolysaccharides, LPSs) from Shigella sonnei mutant strains (Shigella sonnei phase II - 4303, 562H, R41 and 4350) was investigated by capillary electrophoresis and GC-MS. The monosaccharides obtained by hydrolysis were determined by capillary electrophoresis combined with laser induced fluorescence detection (CE-LIF) after labeling with 8-aminopyrene-1,3,6-trisulfonic acid (APTS) and by GC-MS as alditol-acetate derivatives. It was obtained that the lipopolysaccharides of the iso...
Hrčak ID: 74778


eng Synthesis of Selected Naturally Occurring Glucosides of Volatile Compounds. Their Chromatographic and Spectroscopic Properties
Mastelić, Josip; Jerković, Igor; Vinković, Marijana; Džolić, Zoran; Vikić-Topić, Dražen
Croatica Chemica Acta Vol. 77, No. 3, 2004
Naturally occurring glucosides of benzyl alcohol, (±)-menthol, (+)-borneol, thymol, carvacrol and eugenol were synthesized by the Koenigs-Knorr-Zemplén method (yields 19.5–52.2 %). Their β-D-glucopyranosidic structures were determined by one- and two-dimensional homoand heteronuclear <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. The β-configuration was additionally confirmed by the hydrolysis with β-glucosidase. Tetraacetyl-β-D-glucopyranosides, as intermediates, were GC-MS analyzed. Diastereomeric β-glucoside tetraacetates of (±)-menthol...
Hrčak ID: 102950


eng Essential Oil and Glycosidically Bound Volatile Compounds from the Needles of Common Juniper (<i>Juniperus communis</i> L.)
Mastelić, Josip; Miloš, Mladen; Kuštrak, Danica; Radonić, Ani
Croatica Chemica Acta Vol. 73, No. 2, 2000
The essential oil was isolated by hydrodistillation and glycosides were extracted with ethyl acetate from the needles of common juniper. The obtained essential oil was fractionated on microcolumn with solvents of different polarity. Ali fractions were analysed by gas chromatography-mass spectrometry (GC-MS) on two columns with different polarity of the stationary phases. Sixty-three compounds were identified. The main components of juniper needle oil were: &alpha;-pinene (16.9%), sabinene (12.1%), terpinene-4-ol (7.7%), &beta;-phellandrene (7.3...
Hrčak ID: 132073


eng Volatile components from aerial parts of Centaurea spinosociliata Seenus ssp. cristata (Bartl.) Dostál and Centaurea spinosociliata Seenus ssp. spinosociliata growing wild in Croatia
Formisano, Carmen; Senatore, Felice; Bancheva, Svetlana; Bruno, Maurizio; Rosselli, Sergio
Croatica Chemica Acta Vol. 83, No. 4, 2010
The paper reports on the volatile components oil from aerial parts of two Asteraceae growing wild in Croatia: Centaurea spinosociliata ssp. cristata (syn. Centaurea cristata Bartl. subsp. rabenhorstiana (Sch.Bip.) Nyman) (CSC) and C. spinosociliata ssp. spinosociliata (CSS). The volatile components were obtained by hydrodistillation from selected plants and were determined by the GC-MS system on two fused-silica capillary columns of different polarity. The oil content was 0.08 % (CSC) and 0.07 % (CSS) on a dry weight basis. Altogether 73 c...
Hrčak ID: 62644


hrv Štetne tvari u kozmetičkim pripravcima: razlika između deklariranih i analiziranih
eng Harmful substances in cosmetic preparations: the difference between declared and analyzed
Batinić, Ana; Tegeltija, Anamarija; Stolica, Martina; Škorput, Gabriela; Veršić Bratinčević, Maja; Sutlović, Davorka
Kozmetički pripravci sadrže veliki broj sastojaka. Ovi sastojci mogu imati negativnih učinaka, najčešće u obliku alergijskih reakcija, kožnih iritacija, hormonalnih poremećaja te povećan rizik od malignih oboljenja. Ove supstancije su najčešće dodane kako bi zaštitile, omekšale i. učinile proizvod korisnijim. Cilj ove studije bio je otkriti prisutnost nekih potencijalno štetnih supstancija kvalitativnom analizom kozmetičkih proizvoda koristeći GC-MS metodu i usporediti ih sa podacima navedenim na deklaracijama. Analizirano je 66 uzoraka: 10...
Hrčak ID: 266925


hrv Glikozidni sastav polisaharida iz biljke Tinospora cordifolia. II. Glikozidne veze
eng Glycosyl composition of polysaccharide from Tinospora cordifolia. II. Glycosyl linkages
JAHFAR, MUSLIARAKATHBACKER; AZADI, P.
Acta Pharmaceutica Vol. 54, No. 1, 2004
Polisaharid iz biljke Tinospora cordifolia je izoliran, pročišćen, metiliran, hidroliziran, reduciran i acetiliran. Tako dobiveni djelomično metilirani alditol acetat (PMAA) analiziran je GC-MS metodom. Određene su sljedeće vrste veza: terminalna glukoza, 4-ksiloza, 4-glukoza, 4,6-glukoza i 2,3,4,6-glukoza.
Hrčak ID: 16836


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