ABSTRACT. Pumpkins are increasingly regarded as functional foods since they contain valuable nutrients and bioactive substances that have positive health effects. The number of components depends on the origins parts pumpkin, which define its antioxidant capacity. This study evaluated total phenolic, flavonoid, ascorbic acid content activities three pumpkin from four different sample investigated correlation between them. in Dukem, Ethiopia, was highest flesh, peel, seeds compared to other...

The strongly enhanced cooperative influence of medium polarity and organic structural design on the first hyperpolarizability beta a novel family highly polarizable azinium-(CH=CH-thienyl)-dicyanomethanido chromophores 1-3 is described. dyes can be efficiently synthesized by regioselective protonation/alkylation corresponding bidentate anion precursors. Consecutive annelation pyridyl ring 1 (pyridine-->quinoline-->acridine) effects are responsible for an extraordinarily variable range...

Abstract BACKGROUND This study was aimed at the development of objective analytical method capable verifying production region coffee beans. One hundred samples green ( Coffea arabica L.) beans from major producing regions, comprising various sub‐regional types, were studied for variations in their fatty acid compositions by using gas chromatography coupled with mass spectrometry. Principal component analysis (PCA) used to visualize data trends. Linear discriminant (LDA) construct...

Vegetables are consumed worldwide in fresh as well processed forms. Pumpkin is considered an important vegetable due to its nutritional values. The objective of this study was evaluate all the analytical parameters and improve performance methods for determination β-carotene pumpkin flesh, peel, seed samples using UV-VIS, NIR, FTIR methods. β-Carotene measured at 453 nm UV-VIS method which showed linear range, 0.1 12 µg/mL; R2, 0.999; LOD, 0.034 LOQ, RSD, 1.5% 11%; percent recovery, 83% 93%....

ABSTRACT. Pumpkin (Cucurbita maxima) seed oil was extracted using petroleum ether and analyzed for fatty acid compositions physicochemical parameters of the oil. The seeds were found to contain 43.6% (%w/w) Linoleic (50.7%), oleic (18.8%), palmitic (17.9%) stearic (12.4%) as primary acids in pumpkin Physicochemical be value (1.32 mg KOH/g oil), saponification (191 iodine (114 g I2/100 g), peroxide (3.6 meq/kg), specific gravity (0.91 g/mL), refractive index (1.47) viscosity (24.7). According...

This paper reports synthesis, characterization and structural optimization of amino-thienyl-dioxocyano-pyridine (ATOP) chromophores toward a multifunctional amorphous material with unprecedented photorefractive performance. The (dynamic NMR, XRD) electronic (UV/vis, electrooptical absorption, Kerr effect measurements) the ATOP chromophore revealed cyanine-type pi-conjugated system an intense narrow absorption band (epsilon(max) = 140 000 L mol(-)(1) cm(-)(1)), high polarizability anisotropy...

The fatty acids of green coffee beans are one the major components that determine quality coffee. Fatty composition is affected by soil and altitude plants. This study was aimed to evaluate effect plants on in beans.Fatty contents 40 samples collected from grown at different altitudes (group 1: 1500-1700, group 2: 1701-1900 3: > 1900 m.a.s.l.) Ethiopia were determined using gas chromatography-mass spectrometry (GC-MS). Chemometric data analyses performed effects acid beans.The contained main...

This study was conducted to develop fast and cost effective methods for the determination of caffeine in green coffee beans. In present work direct aqueous solution bean performed using FT-IR-ATR fluorescence spectrophotometry. Caffeine also directly determined dimethylformamide NIR spectroscopy with univariate calibration technique.The percentage same sample beans three newly developed methods. The content found be 1.52 ± 0.09 (% w/w) FT-IR-ATR, 1.50 0.14 0.05 spectroscopy. means were...

Traditional fermented alcoholic beverages are indigenous to a particular area and prepared by the local people using an age-old techniques locally available raw materials. The main objective of this work was direct determination ethanol in traditional mid infrared spectroscopy with partial least squares regression, verifying robustness calibration models assess quality beverages. level Ethiopian done regression (MIR-PLS). validation sets, real samples spectra were collected 32 scans from...

Forty-nine green coffee (Coffea arabica L.) bean samples, representing the Harar, Jimma, Kaffa, Wollega, Sidama, and Yirgachefe varieties from east, west, south Ethiopia were analyzed for Mg, P, S, Ca, Mn, Fe, Cu, Ba, Si, K using inductively coupled plasma-optical emission spectroscopy. Principal component analysis was used to group samples based on their elemental compositions. Application of linear discriminant provided models with an accuracy 92% region production 79% variety. The...

The main objective of this study was to improve the performance analytical methods for determination sugars in fermented alcoholic beverages based on mid-infrared-partial least squares (MIR-PLS), high-performance liquid chromatography with ultraviolet detector (HPLC-UV), refractive index (HPLC-RI), and sulfuric acid methods. MIR-PLS method found give good prediction individual sugars: glucose, fructose, sucrose, maltose less than 4% error. HPLC-UV can be used glucose after derivatization p...

Abstract Agriculture generates significant amounts of waste, including waste from khat crops in Ethiopia. This study was conducted to investigate the energy potential and chemical compounds variety wastes different regions The properties studied include moisture content (weight basis), bulk density, dry calorific value, proximate ultimate analysis, screening using method GC–MS. In GC–MS 23 were identified n‐hexane extract oil, accounting for 100% total. solid fuel selected varieties...

This study was aimed to analyze and compare the volatile compounds of flesh, peel seed parts pumpkin (Cucurbita maxima). The were extracted from three different using a hydro-distillation method. Extracts injected into gas chromatography-mass spectrometry system. Mass spectral data collected 40–650 m/z. components identified by matching their mass spectra with those reference recorded in library retention indices. A homologous series n-alkanes (C9–C30) run under same operating conditions as...

Teff ( Eragrostis tef (Zuccagni) Trotter) is one of the underutilized crops that can contribute to food security with distinct nutritional values. The present study was aimed determine total phenolic content, fat and fatty acid profiles evaluate values white brown Injera (ready‐to‐eat food) using UV‐Vis GC‐MS methods. determined free simple compound contents, bound flavonoid contents were 169.48 ± 3.36–178.52 7.5, 53.13 1.92–60.38 0.82, 85.18 1.14–117.59 4.31 mg QE/100 g, respectively, in...

There is no fluorescence spectroscopic method for the determination of trigonelline and theobromine in green coffee beans. Therefore, objective this study was to develop a new determine alkaloids simultaneously aqueous extract beans.The calibration curves were linear range 2-6, 1-6, 1-5 mg/L caffeine, trigonelline, respectively, with R2 ≥ 0.9987. The limit detection quantification 2, 6 7 µg/L 40, 20 respectively. Caffeine exhibited well separated excitation spectra therefore two selectively...

For the determination of 15 potentially toxic elements (V, Cr, Fe, Mn, Co, Ni, Cu, Zn, As, Se, Ag, Cd, Sn, Hg, and Pb) in plant sediment samples Akaki River, Ethiopia, inductively coupled plasma–mass spectrometry, plasma–optical emission a RA-915+ mercury analyzer were applied. Sediment mineralized using closed-vessel microwave-assisted digestion system. The elemental concentrations varied considerably samples. minimum concentration was observed for known (As, Cd) while highest relatively...

Khat (Catha edulis Forsk) is an evergreen shrub of the Celastraceae family. It widely cultivated in Yemen and East Africa, where its fresh leaves are habitually chewed for their momentary pleasures stimulation as amphetamine-like effects. The main psychostimulant constituents khat phenylpropylamino alkaloids: cathinone, cathine norephedrine.In this study, simple procedures based on preparative HPLC salting-out assisted liquid-liquid extraction (SALLE) methods were developed respectively...