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PubMed Journal Database | Food chemistry RSS

02:59 EST 24th February 2020 | BioPortfolio

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Showing PubMed Articles 1–25 of 1,000+ from Food chemistry

Fabrication of caseins nanoparticles to improve the stability of cyanidin 3-O-glucoside.

The influence of encapsulation with caseins on the stability of cyanidin 3-O-glucoside (C3G) was investigated. The modified casein nanoparticles (MCs) prepared at pH 5.5 after heated at 80 °C for 30 min was applied to encapsulate C3G. The diameter of nanoparticle (MCs-C3G) was 110 ± 0.31 nm and zeta-potential was -8.83 ± 0.52 mV. The molecular weight of α-casein (32 kDa) and β-casein (25 kDa) increased along with the encapsulation of C3G. The interactions of MCs with C3G were examined at pH 6...

A non-targeted high-resolution mass spectrometry approach for the assessment of the geographical origin of durum wheat.

The assessment of durum wheat geographical origin is an important and emerging challenge, due to the added value that a claim of origin could provide to the raw material itself, and subsequently to the final products (i.e. pasta). Up to now, the typical approach presented in literature is the evaluation of different isotopic ratios of the elements, but other techniques could represent an interesting and even more powerful alternative. In this study, using a non-targeted high-resolution mass spectrometry app...

Quantitative NIR determination of isoflavone and saponin content of ground soybeans.

Over 3200 discrete soybean samples were obtained from production locations around the United States during the years 2012-2016. Ground samples were scanned on near infrared spectrometers (NIRS) and analyzed by HPLC for total isoflavone and total saponin composition, as well as total carbohydrate composition. Multiple Linear Regression (MLR) analysis of preprocessed spectral data was used to develop optimized models to predict isoflavone content. The selection of a suitable calibration model was based on a h...

Investigation of polymers and alcohols produced in oxidized soybean oil at frying temperatures.

Although significant amounts of polymers associated with adverse health effects in oils are produced during frying, the chemical bonds forming these polymers are not well understood. This study revealed that ester bonds are responsible for the polymerization of soybean oil during frying and heating at 175 °C. The ester value of soybean oil increased during frying up to day 3 of the experiment and slightly decreased on day 4 of the experiment indicating that esterification and hydrolysis concomitantly occu...

Mycotoxins in maize harvested in Serbia in the period 2012-2015. Part 2: Non-regulated mycotoxins and other fungal metabolites.

The main objective of this study was to screen, for the first time, the natural occurrence of non-regulated fungal metabolites in 204 maize samples harvested in Serbia in maize growing seasons with extreme drought (2012), extreme precipitation and flood (2014) and moderate drought conditions (2013 and 2015). In total, 109 non-regulated fungal metabolites were detected in examined samples, whereby each sample was contaminated between 13 and 55 non-regulated fungal metabolites. Moniliformin and beauvericin oc...

The biological activities of the spiderworts (Tradescantia).

Widely used throughout the world as traditional medicine for treating a variety of diseases ranging from cancer to microbial infections, members of the Tradescantia genus show promise as sources of desirable bioactive compounds. The bioactivity of several noteworthy species has been well-documented in scientific literature, but with nearly seventy-five species, there remains much to explore in this genus. This review aims to discuss all the bioactivity-related studies of Tradescantia plants and the compound...

Ultrasound and heating treatments improve the antityrosinase ability of polyphenols.

This paper focused on improving antityrosinase ability of quercetin, cinnamic acid, and ferulic acid (named Q-CA-FA) from Asparagus by combining heating with ultrasound treatments. Fluorescence spectroscopy and UPLC-MS were used to evaluate inhibitory mechanisms. Results showed that the impacts of combining heating (150 °C for 30 min) with ultrasound (600 W for 30 min) treatments were similar to heating treatment (150 °C for 120 min) alone, and the inhibition rate could reach 98.2% in the addition o...

Mechanism of Ca-mediated NOX modulated in ROS metabolism induced by T-2 toxin in potato tuber.

T-2 toxin at low concentrations can induce ROS accumulation and modulate host resistance in plants. NOX plays crucial roles in ROS production and is regulated by Cavia direct binding to EF-hand motifs. In this study, the effect of EGTA (Ca chelating agent) on the expression and enzymatic activity of NOX, as well as the activities and corresponding gene expressions involved in ROS metabolism and cell membrane integrity, were investigated in treated slices. Results indicated that EGTA treatment significantly ...

Resveratrol-loaded core-shell nanostructured delivery systems: Cyclodextrin-based metal-organic nanocapsules prepared by ionic gelation.

In this study, cyclodextrin metal-organic framework/chitosan (CD-MOF/CS) nanocapsules, which have a hydrophobic core and a hydrophilic shell, were fabricated as delivery systems for bioactive agents. The nanocapsules were prepared by electrostatic deposition of cationic chitosan onto the anionic CD-MOF core. The presence of the CS coating reduced the mean diameter and polydispersity index of the nanocapsules, which was attributed to their ability to inhibit particle aggregation. Moreover, the encapsulation ...

Design of nanoemulsion-based delivery systems to enhance intestinal lymphatic transport of lipophilic food bioactives: Influence of oil type.

The impact of nanoemulsions containing triglycerides with different fatty acid chain lengths on the bioavailability of a highly lipophilic bioactive: 5-demethylnobiletin (5-DN) was investigated. 5-DN was encapsulated in nanoemulsions fabricated using either medium-chain triglycerides (MCT) or long-chain triglycerides (LCT). They were then subjected to in vitro digestion, and the resulting mixed micelles was applied to a Caco-2 cell model. Higher 5-DN bioaccessibility was found for the MCT-nanoemulsion (13%)...

Mechanism of enhancing foaming properties of egg white by super critical carbon dioxide treatment.

The effect of supercritical carbon dioxide (SCCD) treatment at varying processing time (30-90 min) on foaming and structure properties of egg white protein (EWP) were studied in this paper. The highest foaming ability (107.7%) was obtained after 60 min SCCD treatment, which was 3.6-fold to the control group. Foaming stability kept stable under the processing time of 75 min. Results of surface tension, surface hydrophobicity, rheological properties and particle size indicated that protein was easier to sp...

Quantification of biomarkers for beef meat qualities using a combination of Parallel Reaction Monitoring- and antibody-based proteomics.

We and others have identified biomarker candidates of tenderness or marbling, two major attributes of bovine meat-eating qualities for consumers' satisfaction. In this study, Reverse Phase Protein Arrays (RPPA) and targeted mass spectrometry assays using Parallel Reaction Monitoring (PRM) were developed to test whether 10 proteins pass the sequential qualification and verification steps of the challenging biomarker discovery pipeline. At least MYH1, TPI1, ALDH1A1 and CRYAB were qualified by RPPA or PRM as b...

Sensory approach and chiral analysis for determination of odour active compounds from feijoa (Acca sellowiana).

The odour-active compounds of feijoa (Acca sellowiana), were isolated by Solvent-Assisted Flavour Evaporation (SAFE). By application of GC-O and the aroma extract dilution analysis (AEDA), nineteen odorants were detected. Volatile compounds with highest flavour dilution (FD) factor were quantified by internal standard and relative response factor. On the basis of the quantitative data and odour thresholds in water, odour activity values (OAV) were calculated. High OAVs were determined for ethyl butanoate, Z...

Policosanol profiles and adenosine 5'-monophosphate-activated protein kinase (AMPK) activation potential of Korean wheat seedling extracts according to cultivar and growth time.

Policosanols is a health promoting aliphatic alcohol known as lipid-lowing agent. To enable maximising the functional properties of wheat, this research investigates the policosanol profiles and adenosine 5'-monophosphate-activated protein kinase (AMPK) activation potential of Korean wheat seedlings according to cultivars and growth times. GC-MS revealed six policosanols that differed markedly in content between 17 cultivars, especially, octacosanol (8) showed the most predominant component (49-83%), varyin...

Fast-dissolving antioxidant curcumin/cyclodextrin inclusion complex electrospun nanofibrous webs.

Curcumin/Hydroxypropyl-beta-Cyclodextrin (HP-β-CyD) and Curcumin/Hydroxypropyl-gamma-Cyclodextrin (HP-γ-CyD) inclusion complex nanofibrous webs were produced using electrospinning technique for the purpose of orally fast-dissolving antioxidant food supplement. Curcumin was totally preserved without any loss during the electrospinning process. The aqueous solutions of curcumin/HP-β-CyD and curcumin/HP-γ-CyD were yielded uniform fiber morphology with ~200 nm and ~900 nm average fiber diameter, respectiv...

The antifungal effects of cinnamaldehyde against Aspergillus niger and its application in bread preservation.

Cinnamaldehyde (CIN) is a promising replacement for chemical synthetic preservatives, which has exhibited effective antimicrobial activities in food applications. In this study we examined the antifungal efficiency of CIN against Aspergillus niger in vitro. In addition, we explored its mode of action and evaluated its application potential in bread preservation in situ. The results showed that CIN exerted different levels of antifungal activity through different treatments, wherein it showed the highest ant...

The postharvest ripening of strawberry fruits induced by abscisic acid and sucrose differs from their in vivo ripening.

In this study, we compared the chemical composition of strawberry (Fragaria × ananassa) fruits that were ripened in vivo (attached to plant) to those ripened during postharvest storage. The effects of the application of abscisic acid (ABA) and sucrose on the postharvest ripening were also evaluated. The results suggested that the postharvest ripening process was dependent on the signal triggered by ABA and differed from in vivo ripening, resulting in fruits with altered chemical composition and firmness....

Lactic acid fermentation enriches the profile of biogenic fatty acid derivatives of avocado fruit (Persea americana Mill.).

This study investigated the capability of selected autochthonous lactic acid bacteria to enrich the portfolio of bioactive compounds of avocado fruit (Persea americana Mill.), with the perspective of producing dietary supplements or pharmaceutical preparations. Fermented avocado puree resulted in high levels of total free amino acids. Fermentation also led to a marked increase of antioxidant activity, with the highest levels found in water and hexane soluble extracts. Bio-converted phenolic compounds and fa...

Development of paper-based microfluidic device for the determination of nitrite in meat.

This study employed the use of a microfluidic paper-based analytical device (µPAD) to determine the concentration of nitrite in pork and enhanced the limit of detection by analyzing the coffee-ring effect. The µPAD was fabricated by designing and embedding wax channels onto the cellulose-based filter paper through printing and subjecting the paper to heat treatment to allow wax penetration. Nitrite concentration was determined by monitoring the colorimetric reaction that occurred between nitrite and the a...

Healthy fats and exclusion-zone size.

A fourth phase of water, labeled exclusion-zone or "EZ," extends from hydrophilic surfaces. Salient features include exclusion of colloidal and molecular solutes, and characteristic light absorbance at 270 nm. In cell systems, EZ water interfaces with membranes, macromolecules, and organelles, and its buildup appears to be vital for function. For years thought to build health, fats have gained a negative reputation over the last few decades. While their exact role in health remains unclear, now they have b...

Quantitative analyses of the umami characteristics of disodium succinate in aqueous solution.

Disodium succinate (WSA) contributes to umami taste in seafoods and it is abundantly found in scallops. However, the actual application of WSA in foods is limited due to a lack of understanding of its taste characteristics and stability. In this study, two-alternative forced choice method was used to determine the relative umami intensity of WSA compared to monosodium glutamate, as well as the relative umami intensity under different conditions (pH and temperature). WSA concentration-taste intensity curve w...

Assessment of rapeseed oil body (oleosome) lipolytic activity as an effective predictor of emulsion purity and stability.

The lipolytic activity in oil body creams as affected by recovery and washing protocols was investigated. The effect of thermal treatment on the hydrolytic activity and physical stability of fresh and aged (up to 30 days) oil body emulsions was studied. The use of alkaline pH solutions (9.5) to soak and grind rapeseeds were more effective reducing the contamination of oil body material from seed proteins/enzymes, compared with neutral pHs. Soaking and grinding seeds with a NaHCO solution (0.1 M, pH 9.5) y...

Origin of the extremely high elasticity of bulk emulsions, stabilized by Yucca Schidigera saponins.

We found experimentally that the elasticity of sunflower oil-in-water emulsions (SFO-in-W) stabilized by Yucca Schidigera Roezl saponin extract, is by >50 times higher as compared to the elasticity of common emulsions. We revealed that strong specific interactions between the phytosterols from the non-purified oil and the saponins from the Yucca extract lead to the formation of nanostructured adsorption layers which are responsible for the very high elasticity of the oil-water interface and of the respectiv...

Time-temperature-resolved functional and structural changes of phycocyanin extracted from Arthrospira platensis/Spirulina.

Arthrospira platensis, commonly known as Spirulina, gains increasing importance as alternative protein source for food production and biotechnological systems. A promising area is functional high-value algae extracts, rich in phycocyanin, a protein-pigment complex derived from A. platensis. This complex has proven functionality as the only natural blue colorant, fluorescent marker and therapeutic agent. The structure-function relationship is heat sensitive, making thermal processing in its production and it...

Rapid screening of rhodamine B in food by hydrogel solid-phase extraction coupled with direct fluorescence detection.

Rhodamine B (RhB), which is vividly colored, although illegal and potentially carcinogenic, has been reported widely as present in various foods, including chili powder, preserved plums, sausage and sweets, presenting a significant health risk. In this work, solid-phase extraction (SPE), coupled with direct fluorescence detection on the same extraction medium, is proposed for rapid onsite screening for RhB in food without sample pretreatment. Parameters that affected extraction of RhB were explored. The low...


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