Polarized Infrared Spectra of Tolane Single Crystal

Polarized infrared spectra of an oriented and very thin tolane crystal have been measured in the 3500--50 cm-1 region. The symmetry of the infra red active internal vibrations is proposed on the basis of the oriented gas model. The application of the vibrational spectroscopy in studying the conformation of the free tolane molecule is discussed

The Fine-Tuned Release of Antioxidant from Superparamagnetic Nanocarriers under the Combination of Stationary and Alternating Magnetic Fields

Superparamagnetic magnetite nanoparticles (MNPs) with excellent biocompatibility and negligible toxicity were prepared by solvothermal method and stabilized by widely used and biocompatible polymer poly(ethylene glycol) PEG-4000 Da. The unique properties of the synthesized MNPs enable them to host the unstable and water-insoluble quercetin as well as deliver and localize quercetin directly to the desired site. The chemical and physical properties were validated by X-ray powder diffraction (XRPD), field emission scanning electron microscopy (FE–SEM), atomic force microscopy (AFM), superconducting quantum interference device (SQUID) magnetometer, FTIR spectroscopy and dynamic light scattering (DLS). The kinetics of in vitro quercetin release from MNPs followed by UV/VIS spectroscopy was controlled by employing combined stationary and alternating magnetic fields. The obtained results have shown an increased response of quercetin from superparamagnetic MNPs under a lower stationary magnetic field and s higher frequency of alternating magnetic field. The achieved findings suggested that we designed promising targeted quercetin delivery with fine-tuning drug release from magnetic MNPs

Prikladnost infracrvene spektroskopije i reološke metode u razlikovanju tradicijskog od industrijskog sira turoša

The aim of this paper was to determine suitability of the infrared spectroscopy and the rheological method for distinguishing traditional cheese from industrial Turoš cheese. Turoš cheese belongs to the group of sour, dried, cone shaped cheeses with added salt and red dry pepper. Cheeses were sampled from 15 family farms and from market (industrial cheeses from five different batches). The rheological parameters of analysed cheeses were in accordance with the chemical composition of the same samples. Infrared spectroscopy of cheeses show good relation with the chemical composition and it has been proved to be a fast and effective method when compared to textural and standard chemical analysis for monitoring the standard procedure of production of sour, dried cheeses such as Turoš cheese. The extensive variability of all the parameters was a result of unbalanced production of Turoš cheese among family farms. Industrial production of Turoš cheese demonstrates more uniformity in relation to traditional on-farm cheese production.Cilj ovog rada bio je utvrditi prikladnost infracrvene spektroskopije i reološke metode u razlikovanju tradicijskog od industrijskog sira turoša. Sir turoš pripada skupini kiselinskih, sušenih sireva u obliku stošca s dodatkom soli i mljevene crvene paprike. Sirevi su uzorkovani na 15 obiteljskih poljoprivrednih gospodarstava i u trgovinama (pet različitih šarži industrijskih sireva). Reološki parametri su u skladu s kemijskim sastavom analiziranih sireva. Infracrvena spektroskopija sireva pokazuje dobru povezanost s kemijskim sastavom, a pokazalo se da je ona učinkovit način za praćenje standardnog postupaka proizvodnje kiselinskih, sušenih sireva kao što je sir turoš u odnosu na standardne teksturalne i kemijske analize. Velika varijabilnost svih parametara je posljedica neuravnotežene proizvodnje sira turoša među obiteljskim poljoprivrednim gospodarstvima. Industrijska proizvodnja sira turoša pokazuje veću ujednačenost u odnosu na tradicijsku proizvodnju sireva na obiteljskim poljoprivrednim gospodarstvima

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)

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 derivatives, benzaldehyde (6.1 %), phenylacetaldehyde (4.9 %) and few norisoprenoids (safranal (7.6 %) as the major). Ultrasonic solvent ex-traction (USE) followed by GC-MS allowed identification of methyl syringate (54.7 %) as predominant compound along with other benzene derivatives. HPLC-DAD analysis determined tyrosine (382.0 mg kg−1), phenylalanine (140.4 mg kg−1) and methyl syringate (39.32 mg kg−1). Methyl syringate and hotrienol can be considered non-specific chemical markers of S. hortensis honey. FTIR-ATR spectral characteristics of S. hortensis honey in fingerprinting region were not significantly different from other honey types, but the integrated intensity of the region was smaller than in other unifloral honeys