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Food Control
Elsevier Science Ltd.
Food Control

Elsevier Science Ltd.

0956-7135

Food Control/Journal Food ControlSCIISTP
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    The p-Anisaldehyde/beta-cyclodextrin inclusion complexes as a sustained release agent: Characterization, storage stability, antibacterial and antioxidant activity

    Lin, YingHuang, RanSun, XiuxiuYu, Xi...
    9页
    查看更多>>摘要：In order to develop a biodegradable agent for food preservation, p-cyclodextrin (beta-CD) inclusion complexes containing p-Anisaldehyde (PAA) were prepared using co-precipitation method. Physical properties including moisture content, bulk density, hygroscopicity, entrapment efficiency and loading capacity of the inclusion complexes showed considerable results for food applications. SEM and particle size test showed notably difference between the prepared inclusion complexes and the other formulations including the raw beta-CD, physical mixture, and the recrystallized beta-CD in both shape and size distribution. FTIR, XRD, TGA and DTA were also carried out and confirmed the formation of inclusion complexes and inhibition of the volatility of encapsulated PAA. As a potential preservation agent, inclusion complexes demonstrated a sustained released behavior in phosphate buffer saline (PBS). Comparing with pure PAA, the inclusion complexes presented a better storage stability in low humidity environment, a higher antioxidant activity, and equal MICs against Escherichia coli and Staphylococcus aureus.
      原文链接:
    • NSTL
    • Elsevier

    Acrylamide in commercial table olives and the effect of domestic cooking

    Duedahl-Olesen, L.Wilde, A. S.Dagnaes-Hansen, M. P.Mikkelsen, A....
    7页
    查看更多>>摘要：Table olive products can contribute to the nutritional intake of acrylamide; a compound classified as a probable carcinogen. For an exposure evaluation of acrylamide the analysis of market products is therefore important. However, it must be taken into account that olives are often used in heated meals e.g. pizza products, which is expected to affect the final acrylamide concentration. Here we present acrylamide concentrations in table olive products collected on the Danish market in the period 2014 to 2019, as well as the effect of domestic heating in an oven. The table olive products contained acrylamide concentrations from below the detection limits to 1100 mu g/kg. After oven baking at 150-270 degrees C for time intervals of 7-21 min acrylamide concentrations ranging from 24 to 18,300 mu g/kg were obtained. Acrylamide concentrations of more than 13,000 mu g/kg were found for olives with water activities (a(w)) of 0.8 that still looked appealing for human consumption. Results from table olives and domestic cooking with palatable olives were found to significantly add to the total acrylamide intake, for some Danish consumers.
      原文链接:
    • NSTL
    • Elsevier

    Towards harmonization of non-targeted H-1 NMR spectroscopy-based wine authentication: Instrument comparison

    Ehlers, MonaHorn, BettinaRaeke, JuliaFauhl-Hassek, Carsten...
    10页
    查看更多>>摘要：Non-targeted Nuclear Magnetic Resonance (NMR) spectroscopy is a promising approach for wine authentication. A prerequisite for its application in official control is the inter-laboratory comparability, which has rarely been the subject of research studies so far. For the first time, in this study an instrument comparison was carried out in order to investigate the extent and impact of instrumental differences on the classification of wine grape varieties. Following a harmonized protocol for sample preparation, spectra acquisition and processing, the same sample set, comprising of 101 red and 100 white wine samples, was analyzed with two NMR spectrometers of the same vendor in different laboratories. Observed spectral differences (intensity, baseline, chemical shift of pHsensitive signals) were accounted for by applying an instrument-specific conversion factor or normalization to total intensity, respectively. Partial Least Squares - Discriminant Analysis (PLS-DA) and Principal Component Analysis - Linear Discriminant Analysis (PCA-LDA) classification models built with data from the individual instruments and with combined data from both instruments achieved comparable accuracies in the internal validation (79-87%). When classification models of the individual instruments were used to predict data of the respective other instrument, results were inconsistent, whereas the use of combined data from both instruments for training and test sets produced more robust and reliable results. This study represents an important step towards harmonization of non-targeted analytical approaches and may help in the development of jointly used databases for food authentication.
      原文链接:
    • NSTL
    • Elsevier

    A highly selective fluorescence nanosensor based on the dual-function molecularly imprinted layer coated quantum dots for the sensitive detection of diethylstilbestrol/cypermethrin in fish and seawater

    Zhang, Rong-rongLi, Xun-jiaSun, Ai-liSong, Su-quan...
    10页
    查看更多>>摘要：The surface molecularly imprinted layer coated CdSe/CdS/ZnS quantum dots (MIP-CdSe/CdS/ZnS QDs) was developed and utilized as the selective optosensing materials of the fluorescence nanosensor to diethylstilbestrol (DES) and cypermethrin (CYP), respectively. The surface morphology, functional group and fluorescence spectroscopy were conducted to demonstrate the fluorescence quenching response of MIP-CdSe/CdS/ZnS QDs to DES/CYP. Under their individual optimal conditions, good linear relationships for DES and CYP were observed in the range of 0.050-20.0 mg/L and 0.10-20.0 mg/L. In addition, the recoveries reached a satisfactory level of 91.4%-101.5 % with an RSD value less than 5.4 % for the samples of seawater and fish. The corresponding limits of detection in seawater and fish can reach 0.004 mu g/L and 3.0 mu g/kg (DES), and 0.3 mu g/L and 5.0 mu g/kg (CYP). This study provided a general strategy for fabricating an efficient fluorescence nanosensor based on a dual template MIP-CdSe/CdS/ZnS QDs to selectively detect different analytes in their individual optimum conditions.
      原文链接:
    • NSTL
    • Elsevier

    Simultaneous detection of Bacillus cereus and Staphylococcus aureus by teicoplanin functionalized magnetic beads combined with triplex PCR

    Bai, XuekunChen, GuanhuaWang, ZhengzhengXie, Guoyang...
    8页
    查看更多>>摘要：Bacillus cereus (B. cereus) and Staphylococcus aureus (S. aureus) are two typical foodborne pathogens. In this study, we proposed a new strategy that combined antibiotic with magnetic beads (MBs) and multiplex PCR (mPCR) to detect B. cereus and S. aureus in juice sample with high sensitivity and specificity. Teicoplanin (TEI) is a glycopeptide antibiotic which can identify Gram-positive bacteria. The polyethylene glycol (PEG) and bovine serum albumin (BSA) double-mediated teicoplanin functionalized magnetic beads (TEI-BPBs) were prepared for separation of target bacteria, and the triplex PCR was used for specific detection by nuc, cesB andflic gene. Under optimal conditions, the TEI-BPBs showed a good ability to simultaneously capture S. aureus (>83%) and B. cereus (>81%). The TEI-BPBs-mPCR assay efficiently detected target bacteria even in the presence of 10(5) CFU/mL non target bacteria. The results showed that the limit of detection (LOD) of B. cereus and S. aureus in PBS and juice sample could reach 10(0) CFU/mL within 4 h. Compared with conventional methods, this method has lower LOD and shorter detection time. The results demonstrate that the constructed TEI-BPBs capture probe and triplex PCR could be successfully applied to the rapid separation and detection of B. cereus and S. aureus or other Gram-positive pathogens in food samples.
      原文链接:
    • NSTL
    • Elsevier

    Determination of methylxanthine contents and risk characterisation for various types of tea in Korea

    Baek, Ga-HyunYang, Sung-WoongYun, Choong-InLee, Joon-Goo...
    9页
    查看更多>>摘要：Tea leaves contain methylxanthines, such as caffeine, which have various physiological and pharmacological effects in vivo. Caffeine, theobromine and theophylline were analysed in various teas to determine the exposure amount and health risk of methylxanthine intake from tea. All the determined validation parameters of the HPLC analysis method, which included specificity, linearity of the calibration curve, detection limit, reproducibility and accuracy, showed satisfactory results. When 83 leached extracts of 11 different teas were analysed by the HPLC method, the average contents of caffeine, theobromine and theophylline were 5561.5, 407.3 and 24.8 mg/ kg, respectively. Pu-erh tea contained the highest average levels of caffeine, while hibiscus tea presented the highest average levels of theobromine and theophylline. Based on the seventh Korea National Health and Nutrition Examination Survey data on food intake, the daily intake of caffeine, theobromine and theophylline was calculated as 30.819, 1.408 and 0.011 mu g/kg body weight/day, respectively, showing low levels of methylxanthine intake compared to the recommended daily intakes.
      原文链接:
    • NSTL
    • Elsevier

    Radio frequency inactivation of E. coli O157: H7 and Salmonella Typhimurium ATCC 14028 in black pepper (piper nigrum) kernels: Thermal inactivation kinetic study and quality evaluation

    Jiao, YangTong, TingyuWang, PinzhengShi, Hu...
    10页
    查看更多>>摘要：In recent years, E. coli O157: H7 and Salmonella Typhimurium outbreaks in black peppers have caused intestinal diseases among human being, which calls for emergence of pasteurization processes for black pepper. Radio frequency (RF) energy has the potential of pasteurizing low moisture spices within a short time. In this study, thermal inactivation kinetics studies of E. coli O157: H7 and Salmonella Typhimurium ATCC 14028 on black pepper kernels were conducted, respectively. Then, RF inactivation experiments were conducted on inoculated black pepper kernels to achieve the required lethality. Results showed the number of log reduction for E. coli O157: H7 was > 6 log CFU/g after 7.0 min when heating to 90 degrees C in RF. Meanwhile, Salmonella Typhimurium ATCC 14028 reached > 6 log CFU/g reduction after 8.0 min RF heating and reaching 100 degrees C. From the quality point of view, the residual amount of Caryophyllene, 3-Carene, D-Limonene, p-Pinene in black pepper after RF pasteurization was 0.0060, 0.0038, 0.0034, 0.0016 mg/g, respectively. Comparatively, after steam pasteurization, Caryophyllene, 3-Carene, D-Limonene, beta-Pinene content in black pepper was 0.0043, 0.0023, 0.0020, 0.0009 mg/g, respectively. Compared with steam heating, flavor substances in black pepper were better retained after RF heating. Thus, RF heating could effectively inactivate E. coli O157: H7 and Salmonella Typhimurium ATCC 14028 without significant influence on the quality of black pepper kernels.
      原文链接:
    • NSTL
    • Elsevier

    Effect of hydrogenation of palm oil products spiked with octachlorodibenzo-p-dioxin on dioxin congener profiles and toxic equivalent levels

    Taverne-Veldhuizen, WilmaHoogenboom, Ronten Dam, GuillaumeHerbes, Rik...
    8页
    查看更多>>摘要：Between 1999 and 2020, there were twelve rapid alerts on dioxins in palm fatty acid distillate (PFAD) products, six of which were associated with hydrogenated palm fatty acid distillates (HPFADs). In palm oil refineries for food and feed, refined palm oil and PFADs can be processed into hydrogenated palm oil and HPFADs. This study investigated the effect of hydrogenation of palm oil products which contain OCDD and impact on the profiles of dioxins in palm oil products and on the toxic equivalent (TEQ) level. Palm oil and PFADs were spiked with octachlorodibenzo-p-dioxin (OCDD) and hydrogenated at different pressures, temperatures, and catalyst conditions. Initially, the concentrations of the lower-chlorinated dioxin congeners, some with a higher toxic equivalency factor, increased. Consequently, the TEQ levels increased and exceeded the regulatory limit. However, further hydrogenation extended the dechlorination of dioxins resulting in decreased TEQ levels. Optimisation of the hydrogenation process is required to reduce the risk of exceeding the limits on dioxins.
      原文链接:
    • NSTL
    • Elsevier

    Prenylated (iso)flavonoids as antifungal agents against the food spoiler Zygosaccharomyces parabailii

    Kalli, SylviaAraya-Cloutier, CarlaChapman, JohnSanders, Jan-Willem...
    11页
    查看更多>>摘要：Species belonging to the Zygosaccharomyces bailii sensu lato clade are some of the most troublesome spoilage yeasts of acidic food products, primarily due to their resistance towards synthetic food preservatives, like weak organic acids. Therefore alternative, powerful and more natural antifungal agents are needed. Herein, prenylated isoflavonoids, present mainly in the Leguminosae family, were investigated for their antifungal properties (including potency and mode of action) against a Z. bailii food isolate, its interspecies hybrid, Z. parabailii. The mono-prenylated isoflavonoids, wighteone and glabridin were the most active, with minimum fungicidal concentrations (MFC) of 12.5 mu g/mL (37 mu M) and 25 mu g/mL (77 mu M), respectively, at pH 4.0, rendering them over 20 times (on weight basis) more potent than sorbic acid (MFC 550 mu g/mL, 4.5 mM). The two active monoprenylated isoflavonoids induced killing within 15 min, suggesting potential membrane activity. Membrane permeabilization by these molecules was confirmed by propidium iodide uptake and TEM imaging. Membrane permeabilization was accompanied with leakage of intracellular material. Molecular properties such as the electrostatic energy potential and the hydrophobic integy moment were correlated to activity through a binary classification quantitative structure-activity relationship (QSAR) model. Altogether, mono-prenylated isoflavonoids can serve as highly potent, novel and natural antifungal against Z. parabailii acting by severely compromising the membrane integrity.
      原文链接:
    • NSTL
    • Elsevier

    Quantification of mycotoxin residues in domestic and imported chicken muscle, liver and kidney in Jordan

    Alaboudi, Akram R.Osaili, Tareq M.Otoum, Ghaida
    5页
    查看更多>>摘要：This study aimed to detect mycotoxins (aflatoxin B1, ochratoxin A, zearalenone, fumonisin B1 and deoxynivalenol) residues in imported frozen/local fresh chicken muscle and local fresh liver/kidney samples in Jordan. A total of 300 samples composed of 50 imported frozen and 150 locally produced fresh chicken muscle, 50 fresh liver and 50 kidney samples were analyzed. These were examined for mycotoxins using liquid chromatography-mass spectrophotometry (LC-MS/MS). The overall concentrations of mycotoxin residues in the tested samples ranged from 0.03 to 2920.00 mu g/kg (mean 0.23-324.24 mu g/kg). Zearalenone and aflatoxin B1 exceeding the maximum residue level (MRL) were found in 14 and 2% of the imported chicken muscle samples, respectively. Aflatoxin B1, zearalenone and deoxynivalenol above the MRL were found in 0.7%, 10.7% and 8.7% of local chicken muscle samples, respectively. Zearalenone (>MRL) was the only toxin detected in the local liver samples whereas zearalenone, fumonisin B1 and deoxynivalenol (>MRL) were present in local kidney samples. The results revealed a significant difference in the prevalence of deoxynivalenol between local and imported chicken muscle samples (P < 0.05), while fumonisin B1 was significantly higher in local chicken kidney samples than local chicken muscle or liver samples. Results also showed that zearalenone was significantly higher in liver (30.0%) than in kidney samples (8.0%). These data may be useful to food control authorities in Jordan to implement mycotoxins residue monitoring and controls in all chicken meat products.
      原文链接:
    • NSTL
    • Elsevier