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eng Kinetic Study of the Thermochemical Degradation of Lignocellulosic Materials Based on TG-FTIR, Py-GC/MS and 13C NMR Experiments
Hrablay, I.; Jelemenský, Ľ.
Pyrolysis of a hardwood representative, beech sawdust (Fagus sylvatica), was investigated by thermogravimetry, a thermal analysis technique. A suitable kinetic approach for the determination of kinetic parameters was proposed. The model fitting method was used to optimize the kinetic parameters of the reaction pathways of the selected reaction mechanisms. The experiments were conducted starting from ambient temperature up to 600 °C using the following five heating rates: 2, 5, 10, 15, and 20 °C min–1. FTIR, Py-GC/MS, 13C NMR, and elemental anal...
Hrčak ID: 167271


eng Chemical Composition and Antioxidant Activity of Essential Oils of Twelve Spice Plants
Politeo, Olivera; Jukić, Mila; Miloš, Mladen
Croatica Chemica Acta Vol. 79, No. 4, 2006
Chemical compositions and related total antioxidant capacities of twelve spice essential oils were analyzed. To enable a comparison of their relative antioxidant potentials, essential oils were extracted by hydrodistillation from selected spice plants and their chemical compositions were determined by the GC-MS system on two fused-silica capillary columns of different polarity. Antioxidant effectiveness was examined by four different methods: the 2,2'-diphenyl- 1-picrylhydrazyl (DPPH) radical scavenging method, determination of ferric reducing...
Hrčak ID: 5761


eng Essential Oil and Glycosidically Bound Volatiles of Thymus pulegioides L. growing Wild in Croatia
Radonić, Ani; Mastelić, Josip
Croatica Chemica Acta Vol. 81, No. 4, 2008
The present paper represents the continuation of our research of free (essential oil) and glycosidically bound volatile compounds from Croatian wild-growing aromatic plants. The essential oil and glycosidically bound volatile compounds were isolated from the fresh and dried plant material of Thymus pulegioides L. at three stages of plant development and analysed by gas chromatography-mass spectrometry (GC-MS). The most abundant constituents in essential oils were geraniol and linalool followed by thymol, g-terpinene, thymol methyl ether, b...
Hrčak ID: 31185


eng Essential Oil of Portenschlagiella ramosissima from Croatia, a Rich Source of Myristicin
Maleš, Željan; Plazibat, Miško; Bucar, Franz
Croatica Chemica Acta Vol. 82, No. 4, 2009
<p align="justify">Isolation of the essential oil from the ripe fruits of <i>Portenschlagiella ramosissima (Apiaceae)</i> by hydrodistillation yielded 1.2 % (vol./w). By GC-FID and GC-MS analyses on fused silica capillaries with polar and non-polar stationary phases, respectively, 19 compounds representing 98.0 % of the total peak area could be identified. Major constituents were γ-terpinene (41.0 %) followed by myristicin (25.3 %, 257.2 ± 2.70 mg per gram of oil) and p-cymene (14.5 %). As a conclusion, in the sample of <i>P. ramosissima</i> c...
Hrčak ID: 45533


eng Anthelmintic activity of praziquantel and Spilanthes acmella extract on an intestinal cestode parasite
LALTHANPUII, PAWI BAWITLUNG; ZOKIMI, ZAR; LALCHHANDAMA, KHOLHRING
Acta Pharmaceutica Vol. 70, No. 4, 2020
Spilanthes acmella Murr., popularised as toothache plant, is a well-known culinary and medicinal plant for different purposes, but its use as an anthelmintic is apparently exclusive to the Mizo people of India and Myanmar. A chloroform extract of Spilanthes acmella Murr. was analysed in a single quadrupole GC-MS system, from which it was found that the major compound was an alkylamide, N-isobutyl-(2E,4Z,8Z,10E)-dodecatetraenamide. A comparative study was performed on the anthelmintic activity of the plant extract and praziquantel (PZQ) against...
Hrčak ID: 233118


eng PLANT PROTECTION PRODUCT RESIDUES IN APPLES, CAULIFLOWER, CEREALS, GRAPE, LETTUCE, PEAS, PEPPERS, POTATOES AND STRAWBERRIES OF THE SLOVENE ORIGIN IN 2006
slv OSTANKI FITOFARMACEVTSKIH SREDSTEV V JABOLKIH, CVETAČI, ŽITIH, GROZDJU, SOLATI, GRAHU, PAPRIKI, KROMPIRJU IN JAGODAH SLOVENSKEGA POREKLA V LETU 2006
BAŠA ČESNIK, Helena; GREGORČIČ, Ana; VELIKONJA BOLTA, Špela
In the year 2006, 181 apple, cauliflower, cereal, grape, lettuce, pea, pepper, potato and strawberry samples from Slovene producers were analysed for plant protection product residues. The samples were analysed for the presence of 86 different active compounds using four analytical methods. In nine samples (5.0 %) exceeded maximum residue levels (MRLs) were determined which is comparable with the results of the monitoring of plant protection product residues in products of plant origin in the European union, Norway, Iceland and Liechtenstein in...
Hrčak ID: 52334


hrv Diferencijacija komercijalnih vina sa zaštićenom oznakom izvornosti proizvedenih u Istri (Hrvatska), dobivenih od različitih sorata iz dvije berbe, pomoću hlapljivih sastojaka arome određenih metodom HS-SPME-GC/MS
eng Differentiation of Commercial PDO Wines Produced in Istria (Croatia) According to Variety and Harvest Year Based on HS-SPME-GC/MS Volatile Aroma Compound Profiling
Lukić, Igor; Horvat, Ivana
Food Technology and Biotechnology Vol. 55, No. 1, 2017
Mikroekstrakcijom na čvrstoj fazi uz plinsku kromatografiju i spektrometriju masa (HSSPME-GC/MS) ispitani su hlapljivi sastojci arome za diferencijaciju vina domaćih i introduciranih sorata Malvazija istarska, Chardonnay i Muškat žuti, ubranih 2013. i 2014. godine u Istri (Hrvatska). Utvrđen je značajan utjecaj sorte i godine berbe na hlapljive sastojke arome, no interakcija tih dvaju faktora otežala je diferencijaciju uzoraka vina. Spojevi koji su poslužili kao pouzdani markeri sortnog podrijetla, i to: nerol u sorti Malvazija, etil-cinamat i...
Hrčak ID: 178275


hrv Slučaj trovanja sintetskim kanabinoidima u Hrvatskoj
eng A case of synthetic cannabinoid poisoning in Croatia
Sutlović, Davorka; Prkačin, Ingrid; Vaiano, Fabio; Bertol, Elisabetta; Veršić Bratinčević, Maja; Definis-Gojanović, Marija
Broj novih psihoaktivnih tvari (engl. new psychoactive substances, krat. NPS), osobito sintetskih kanabinoida (engl. synthetic cannabinoids, krat. SC), stalno se povećava. Zbog nedovoljno istraženih učinaka na zdravlje korisnika, te tvari stvaraju velike probleme odjelima hitne medicine. Teško je dokazati njihovu prisutnost, a protuotrovi koji bi mogli poništiti njihovo štetno djelovanje nisu poznati. Prikazujemo slučaj trovanja mladog muškarca koji je konzumirao sintetske kanabinoide. Pacijent je zaprimljen na odjel hitne službe Kliničke bolni...
Hrčak ID: 202288


eng In vitro Assessment of Two Species of the Genus Pinus Growing in Algeria for their Antimicrobial and Antioxidant Activity
Fekih, Nadia; Allali, Hocine; Merghache, Salima; Bouchentouf, Salim; Costa, Jean
A comparative study of the hydrodistilled oils of Pinus pinea L. and Pinus pinaster Aiton by GC and GC-MS was conducted. The combined essential oil of P. pinea was rich in limonene (56.5%), followed by α-pinene (6.5%) and β-phellandrene (6.2%). The major compounds from the combined essential oil of P. pinaster were: α-pinene (36.4%), β-pinene (12.3%) and (E)-β-caryophyllene (7.1%). The results showed that the oils have a great potential as antibiotics against some microorganisms: Klebsiella pneumoniae, Enterococcus faecalis and Candida albicans...
Hrčak ID: 218528


eng Comparative evaluation of powdered and aqueous extract of citrus peels and carbofuran in the management of root-knot nematode on infected cowpea field
Izuogu, Nkechi Betsy; Azubuike, Chidinma; Hinmikaiye, Abiodun Solomon; Olarenwaju, Akeem
Two years of experimental trials were conducted in Nigeria to investigate the effect of powdered and aqueous extract of citrus (sweet orange) peel in the management of root-knot nematodes of cowpea cultivar ‘IT96D-610’. Different concentrations of aqueous citrus (sweet orange) peel extracts were used as well as different amount of citrus (Sweet Orange) peel powder. As a standard check carbofuran was used. Furthermore, phytochemical screening was carried out to determine the presence of secondary metabolites, while GC-MS was used to identify the...
Hrčak ID: 221761