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eng GC-MS Characterization of Acetylated O-glucofuranosides: Direct Glucosylation of Volatile Alcohols from Unprotected Glucose
hrv GC-MS karakterizacija acetiliranih O-glukofuranozida: izravna glukozilacija isparljivih alkohola iz nezaštićene glukoze
Jerković, Igor; Mastelić, Josip; Blažević, Ivica; Šindler-Kulyk, Marija; Vikić-Topić, Dražen
Croatica Chemica Acta Vol. 78, No. 2, 2005
O-Glucosylation of 1-pentanol, 1-octanol, 2-phenylethanol, benzyl alcohol, (±)-2-pentanol and (±)-menthol in 1,4-dioxane, using anhydrous FeCl3, afforded anomeric mixture of the corresponding glucofuranosides as major and glucopyranosides as minor products in overall yields 20–52 %. Practical advantages of GC-MS for characterizing the prepared acetylated glucofuranosides are in the focus of this paper. Glucofuranoside tetraacetate spectra contain characteristic signals of glucone (acetylated glucose) along with fragments of the aglucone moiety...
Hrčak ID: 27


eng Chemical Composition and Antioxidant Activity of Free Volatile Aglycones from Laurel (Laurus nobilis L.) Compared to Its Essential Oil
Politeo, Olivera; Jukić, Mila; Miloš, Mladen
Croatica Chemica Acta Vol. 80, No. 1, 2007
The paper examines the chemical composition and antioxidant activity of free volatile aglycones from laurel (Laurus nobilis L.) as compared to its essential oil. Comparison of the chemical composition of volatile aglycones with the chemical composition of essential oil showed there was no similarity between the free compounds found in the essential oil and the corresponding volatile aglycones. Only eugenol was found to be identical. To evaluate the said antioxidant activities, two different methods were applied: 2,2’-diphenyl-1-picrylhydra...
Hrčak ID: 12833


eng Analysis of diclofenac in water samples using in situ derivatization-vortex-assisted liquid-liquid microextraction with gas chromatography-mass spectrometry
AYDIN, SENAR; AYDIN, MEHMET EMIN; BEDUK, FATMA; TEKINAY, ARZU; KILIC, HAVVA
Acta Pharmaceutica Vol. 68, No. 3, 2018
A novel micro-extraction technique for a rapid and sensitive analysis of diclofenac (DCF) in water samples has been developed. DCF was derivatized and extracted simultaneously using vortex-assisted liquid-liquid micro-extraction (VALLME) prior to gas chromatography with mass spectrometry detection. The effects of extraction solvent volume, extraction and derivatization time and ionic strength of the sample were studied using 23 factorial experimental design. The optimum extraction conditions were as follows: 200 µL of chloroform, 25 µL of N-met...
Hrčak ID: 195716


eng PLANT PROTECTION PRODUCT RESIDUES IN AGRICULTURAL PRODUCTS OF SLOVENE ORIGIN FOUND IN 2008
BAŠA ČESNIK, Helena; VELIKONJA BOLTA, Špela; GREGORČIČ, Ana
In the year 2008, 166 apple, bean, carrot, cucumber, lettuce, pear, potato and spinach samples from Slovene producers were analysed for plant protection product residues. The samples were analysed for the presence of 158 different active compounds using three analytical methods. In two samples (1.2%) exceeded maximum residue levels (MRLs) were determined which is better than the results of the monitoring of pesticide residues in the products of plant origin in the 27 European Union, Member States (EU MS) and 2 European Free Trade Association (E...
Hrčak ID: 76036


eng Phytochemical Composition, Antiradical and Anticholinesterase Potentials of Centaurea alba and Centaurea jacea Volatile Oils
Politeo, Olivera; Carev, Ivana; Veljaca, Anita
Croatica Chemica Acta Vol. 92, No. 1, 2019
This paper reports on the phytochemical composition as well as antiradical and anticholinesterase potential of volatile oils isolated from Centaurea alba and Centaurea jacea, from Croatia. The volatile components, obtained by hydrodistillation, were determined by GC and GC-MS analyses. A total of 18 compounds were identified in C. alba volatile oil with hexadecanoic acid, germacrene D and tetradecanoic acid as main compounds. A total of 29 compounds were identified in C. jacea volatile oil, with epi-bicyclosesquiphellandrene, aromadendrene and...
Hrčak ID: 216842


hrv Učinak metode lakiranja na emisiju hlapljivih organskih spojeva
eng Method of Lacquer Products on Emissions of Volatile Organic Compounds
Stachowiak-Wencek, Agata; Prądzyński, Włodzimierz
Drvna industrija Vol. 66, No. 1, 2015
Cilj istraživanja bio je utvrditi utjecaj primijenjenih metoda lakiranja proizvoda u proizvodnji namještaja na emisiju hlapljivih organskih spojeva (VOCs). Uzorci zraka za analizu prikupljeni su u tri industrijska postrojenja u Poljskoj u kojima se proizvodi namještaj. U svakome od tih postrojenja za proces površinske obrade upotrebljavaju se vodeni lakovi, ali se primjenjuju različiti uređaji i strojevi za nanos laka: automatizirane linije za površinsku obradu, automatizirani vertikalni uređaji za prskanje, uređaji za površinsku obradu sa zavj...
Hrčak ID: 136837


hrv Sastav i antimikrobno djelovanje eteričnog ulja iz plodova biljke Amomum cannicarpum
eng Composition and antimicrobial activity of essential oil from the fruits of Amomum cannicarpum
BABY, SABULAL; MATHEW, DAN; NEDIYAMPARAMBU, SUKUMARAN PRADEEP; VALSAMMA, RENJU KRISHNA; VARUGHESE, GEORGE
Acta Pharmaceutica Vol. 56, No. 4, 2006
Eterično ulje iz plodova biljke Amomum cannicarpum (Wight) Bentham ex Baker (Zingiberaceae) dobiveno je destilacijom vodenom parom, a zatim je pomoću plinske kromatografije i masene spektrometrije (GC-MS) određen njegov sastav. Najvažniji sastojci u ulju bili su -pinen (14.00%), elemol (10.45%) i -kadinol (8.50%). Ukupno je od 41 sastojka identificirano 33 sastojka (91.48%). Disk-difuzijskom metodom određeno je antimikrobno djelovanje ulja na Gram-pozitivne i Gram-negativne bakterije i neke gljivice. Dosta snažno antimikrobno djelovanje zapaž...
Hrčak ID: 4616


eng Free and Bound Sulphur Containing and Other Volatile Compounds from Evergreen Candytuft (Iberis sempervirens L.)
Mastelić, Josip; Blažević, Ivica; Jerković, Igor
Croatica Chemica Acta Vol. 79, No. 4, 2006
Volatile fractions of evergreen candytuft, Iberis sempervirens (Brassicaceae), were isolated by simultaneous hydrodistillation-extraction from fresh plant material prior and after autolysis and from dried plant material and were then analyzed using GC and GC-MS. Isothiocyanates, nitriles, aliphatic alcohols, carbonyls, fatty acids, hydrocarbons, terpene compounds, C13-norisoprenoids and phenylpropane derivatives were identified – thirty-nine components in all. Major components of all samples were: 3-butenyl isothiocyanate (17.4–63.3 %), 5-methy...
Hrčak ID: 5804


eng Pulsed electric field and combination processing of mango nectar: effect on volatile compounds and HMF formation
Kumar, R.; Bawa, A. S.; Rajeswara Reddy, K.; Kathiravan, T.; Subramanian, Vijayalakshmi; Nadanasabapathi, S.
Mango nectar is a commercially familiar and preferred product. The traditional processing of mango nectar has been by thermal processing which resulted in the alteration of the flavour of the product due to the effect of high temperature. The thermal processing of the nectar also resulted in the production of byproducts of non-enzymatic browning such as 5- hydroxy methyl furfural (HMF). These process induced effects, affect both the nutritive and sensory attributes of the fruit product, making it less preferable. With the growing interest and a...
Hrčak ID: 150082


eng UPLC-HRESI-MS and GC-MS analysis of the leaves of Nicotiana glauca
MASSADEH, RAFEEF K.; EL-ELIMAT, TAMAM; AL-GHARAIBEH, MOHAMMAD; TAWAHA, KHALED; ALALI, FERAS Q.
Acta Pharmaceutica Vol. 72, No. 1, 2022
The alkaloid-rich fraction obtained by fractionation of the crude methanolic extract of the leaves of wild Tobacco tree Nicotiana glauca Graham (Solanaceae) was analyzed using UPLC-MS and GC-MS. Anabasine, a piperidine alkaloid, was identified as the major constituent with approximately 60 % (m/m) of the alkaloid-rich fraction. In addition to anabasine, six secondary metabolites were identified using high-resolution UPLC-MS. Anabasine was quantified in the leaves to be 1 mg g–1 dry plant material. The GC-MS analysis revealed five compounds with...
Hrčak ID: 253981