Impact of thermal pretreatment on crystallization of Thompson raisins
Publication date: Available online 10 February 2020Source: Food ChemistryAuthor(s): Lorena Alvarez, Paulina Urrutia, Araceli Olivares, Agustín Flores, Bhesh Bhandari, Tuyen Truong, Sergio AlmonacidAbstractAfter prolonged storage or during the shipment of raisins, a crystalline material may be developed on their surface, affecting the final acceptability of the product. The mild thermal pretreatment (50°C for a period of 12h and 48h) was applied to dissolve any potential tiny crystals and nuclei already present in the raisins. The thermal pretreatment of raisins resulted in a reduction on the percentage of crystallized ra...
Source: Food Chemistry - February 15, 2020 Category: Food Science Source Type: research
Molecules, Vol. 25, Pages 669: Comparison of Different Categories of Slovak Tokaj Wines in Terms of Profiles of Volatile Organic Compounds
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The present work deals with the characterization of volatile organic compounds (VOCs) in wines from the Slovak Tokaj wine region. Studied wine samples were divided into three groups—varietal wines from registered Tokaj vine varieties, film wines Tokajské samorodné dry, and naturally sweet botrytized wines Tokaj selections. The VOCs from wines were extracted using optimized solid phase microextraction (SPME) and analyzed by comprehensive two-dimensional gas chromatography (GC×GC) coupled to high-resolution time-of-flight mass spectrometry (HRTOF-MS). In tota...
Source: Molecules - February 3, 2020 Category: Chemistry Authors: Katar ína Furdíková Andrea Machy ňáková Tereza Drtilov á Ivan Špánik Tags: Article Source Type: research
Molecules, Vol. 25, Pages 608: Impact of Drying Method on the Evaluation of Fatty Acids and Their Derived Volatile Compounds in ‘Thompson Seedless’ Raisins
This study shows that air-drying is more favorable for the production of fatty acids (SFAs and USFAs), whereas sun-drying is more advantageous in terms of fatty acid-derived volatiles. (Source: Molecules)
Source: Molecules - January 29, 2020 Category: Chemistry Authors: Dong Wang Hafiz Umer Javed Ying Shi Safina Naz Sajid Ali Chang-Qing Duan Tags: Article Source Type: research
Evaluation of nutrient content, physicochemical and functional properties of desalted duck egg white by ultrafiltration as desalination
In this study, the effects of ultrafiltration technique on the desalination efficiency, nutrient content, physicochemical properties, functional properties, texture profile, and microstructure of salted duck egg white were evaluated. The results showed that ultrafiltration can remove 92.93% salt from salted duck egg white (SDEW) and final salt% of desalted duck egg white (DDEW) was 0.65%. The analysis of nutrient content and amino acid of SDEW and desalted duck egg white powder (DDEWP) sample was significantly lower than those of fresh duck egg white (FDEW). Although emulsifying capacity of SDEW, DDEW, and DDEWP exhibited ...
Source: Animal Science Journal - January 25, 2020 Category: Zoology Authors: Rommanee Thammasena,
Chi ‐Wei Fu,
Jeng‐Hung Liu,
Deng‐Cheng Liu Tags: ORIGINAL ARTICLE Source Type: research
Nanofluid extraction of Ochratoxin A in food
Publication date: Available online 20 January 2020Source: Journal of Food Composition and AnalysisAuthor(s): Rouhollah Karami-OsbooAbstractMonitoring of Ochratoxin A (OTA), a toxic and carcinogenic metabolite of fungi, requires accurate and precise analytical methods. Quantitative determination of OTA at trace level in raisin samples was evaluated by nanofluid extraction coupled with HPLC–FLD. The experimental parameters affecting the extraction efficiency of OTA were investigated and optimized. The validated method has low detection and quantification limit (0.2 and 0.5 ng g-1). Moreover, under optimum conditions, the...
Source: Journal of Food Composition and Analysis - January 21, 2020 Category: Food Science Source Type: research
Crystallisation and glass transition behaviour of Chilean raisins in relation to their sugar compositions
Publication date: 1 May 2020Source: Food Chemistry, Volume 311Author(s): Tuyen Truong, Deepa Dahal, Paulina Urrutia, Lorena Alvarez, Sergio Almonacid, Bhesh BhandariAbstractThe effects of sugar component ratio, water fraction, and storage conditions on crystallisation and glass transition temperature (Tg) of three Chilean dried raisins were examined by using differential scanning calorimetry (DSC), polarised light microscopy and X-ray diffraction (XRD) techniques. Thompson, Flame and Golden raisins differed in fructose:glucose and glucose:water ratios, impacting on their measured Tgs (P < 0.05) and propensity of suga...
Source: Food Chemistry - December 17, 2019 Category: Food Science Source Type: research
Cost-effective voltammetric determination of boron in dried fruits and nuts using modified electrodes
Publication date: 1 May 2020Source: Food Chemistry, Volume 311Author(s): Lokman Liv, Nuri NakiboğluAbstractCost effective, simple and accurate two voltammetric methods for determination of boron in hazelnut, peanut, almond, raisin, prune and date samples were described. Metal nanoparticles-carbon nanotube modified glassy carbon electrode (MNP/CNT/GCE, M = Au or Cu) and poly xylenol orange modified pencil graphite electrode (p-XO/PGE) were used as working electrodes. The oxidation of alizarin red s (ARS) in the boron-ARS complex at MNP/CNT/GCE and the oxidation of tiron in the B-tiron complex at p-XO/PGE were monitored a...
Source: Food Chemistry - December 17, 2019 Category: Food Science Source Type: research
Mycotoxins in blood and urine of Swedish adolescents —possible associations to food intake and other background characteristics
In conclusion, exposure to mycotoxins in Swedish adolescents is common, but fortunately, high exposure was rare. (Source: Mycotoxin Research)
Source: Mycotoxin Research - December 13, 2019 Category: Toxicology Source Type: research
Influence of sleep bruxism severity on masticatory efficiency: electromyographic analysis.
The objective of the present study was to ascertain masticatory efficiency by evaluating electromyographic activity in the masseter and temporalis muscles in subjects with sleep bruxism of varying severity, as determined by BiteStrip. Thirty-four subjects with sleep bruxism were divided into two groups: a mild sleep bruxism group with a mean (± standard deviation) age of 31.3 ± 6.2 years (n = 15) and a severe sleep bruxism group with a mean age of 29.8 ± 7.1 years (n = 19). Full-night polysomnography (PSG) was performed in eligible subjects. The linear envelope integral was used to determine masticatory efficiency on th...
Source: Archives Italiennes de Biologie - December 12, 2019 Category: Neuroscience Tags: Arch Ital Biol Source Type: research
Machine vision system for classification of bulk raisins using texture features
Publication date: Available online 5 December 2019Source: Journal of Food EngineeringAuthor(s): Mostafa Khojastehnazhand, Hamed RamezaniAbstractClassification of bulk raisin is one of the main challenges to producers and buyers of raisin in the world. In this research, the quality of bulk raisin was investigated by using the image processing technique. For this purpose, 750 images of bulk raisin containing a different mixture of good and bad raisin with wood were used (50 images × 15 class). Different texture feature algorithms combined with different modeling methods were used to evaluate the system performance. The ...
Source: Journal of Food Engineering - December 6, 2019 Category: Food Science Source Type: research
Viability assessment of Bifidobacterium longum ATCC 15707 on non-dairy foods using quantitative fluorescence microscopy
This study demonstrates an effective technique for separating and purifying viable bacteria from samples that interfere with viability staining. The viability of Bifidobacterium longum ATCC 15707 was assessed using Percoll Buoyant Density Gradient Centrifugation (PBDC) to separate bacteria from complex non-dairy food matrices and Quantitative Fluorescence Microscopy (QFM) to determine individual cells using LIVE/DEAD BacLight bacterial viability staining. Water agar (3%) was used to retain cells of B. longum and offered a lower fluorescence background with BacLight viability staining, compared with fixation on polycarbonat...
Source: Journal of Microbiological Methods - November 15, 2019 Category: Microbiology Source Type: research
Experimental study of strength properties of SLA resins under low and high strain rates
Publication date: Available online 9 November 2019Source: Mechanics of MaterialsAuthor(s): Danuta Miedzińska, Roman Gieleta, Ewelina MałekAbstractA study of the material properties of resins used for stereolithography rapid prototyping is presented in the paper. The samples were prepared in accordance with producers' guidelines and loaded in two ways: quasi-static and with the use of a Hopkinson bar. Different strain rates were considered in this way. The researched material showed significant differences when responding to the different strain-rate loadings. The presented work will be used in numerical constitutive mode...
Source: Mechanics of Materials - November 11, 2019 Category: Materials Science Source Type: research
Toddlers Process Common and Infrequent Childhood Mispronunciations Differently for Child and Adult Speakers.
Conclusion These results both reinforce and extend previous work on toddlers' processing of mispronunciations by revealing a complex interplay of speaker, type of mispronunciation, and specific contrast in toddlers' perceptions of mispronunciations.
PMID: 31644384 [PubMed - as supplied by publisher] (Source: Journal of speech, language, and hearing research : JSLHR)
Source: Journal of speech, language, and hearing research : JSLHR - October 22, 2019 Category: Speech-Language Pathology Authors: Bernier DE, White KS Tags: J Speech Lang Hear Res Source Type: research
An analytical strategy for propoxur determination in raisin samples with matrix matching method after dispersive liquid-liquid microextraction
In this study, an accurate vortex assisted dispersive liquid-liquid microextraction (VA-DLLME) strategy was developed for the sensitive determination of propoxur from raisin samples prior to determination by gas chromatography mass spectrometry (GC-MS). Single-factor variable experiments were carried in the optimization of significant parameters influencing the extraction recovery to obtain optimum experimental outcomes. Under the optimal conditions, the calculated values for detection and quantification limits (LOD, LOQ) were 0.24 and 0.81 µg/L, respectively. A 105 fold enhancement in the detection power of the GC-MS w...
Source: Journal of Food Composition and Analysis - September 15, 2019 Category: Food Science Source Type: research
