Use of UHPLC-TripleQ with synthetic standards to profile anti-inflammatory hydroxycinnamic acid amides in root barks and leaves of Lycium barbarum
In this study, we combined organic synthesis and UPHLC-TripleQ-MS/MS specifically targeting at HCAA species. The method was fully validated with respect to specificity, linearity, intra- and inter-day precision and accuracy, limit of detection (LOD), limit of quantification (LOQ), recovery, and reproducibility. We applied this method to identify and quantify HCAAs from the root barks and leaves of Lycium barbarum. HCAA species were reported in leaves for the first time, and 10 new HCAA species were further identified in root barks in addition to the ones reported in the literature. We also examine anti-inflammatory propert...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Employing natural reagents from turmeric and lime for acetic acid determination in vinegar sample
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Sam-ang Supharoek, Kraingkrai Ponhong, Watsaka Siriangkhawut, Kate GrudpanAbstractA simple, rapid and environmentally friendly sequential injection analysis system employing natural extract reagents was developed for the determination of acetic acid following an acid–base reaction in the presence of an indicator. Powdered lime and turmeric were utilized as the natural base and indicator, respectively. Mixing lime and turmeric produced an orange to reddish-brown color solution which absorbed the maximum wavelength at 455 n...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Antioxidant activity and calcium binding of isomeric hydroxybenzoates
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Zichen Zhao, Martina Vavrusova, Leif Horsfelt SkibstedAbstractThe association constant for calcium binding to hydroxybenzoates in aqueous 0.16 M NaCl at 25 °C was found electrochemically to have the value Kass = 280 mol L−1 with ΔHo = −51 kJ mol−1, ΔSo = −122 J mol−1 K−1 for the 2-isomer (salicylate), Kass = 7 mol L−1 with ΔHo = −39 kJ mol−1, ΔSo = −116 J mol−1 K−1 for the 3-isomer, and Kass = 8 mol L−1 with ΔHo = −51 kJ mol−1, ΔSo = −155 J mol−1Â...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Water-soluble polysaccharides from Ulva intestinalis: Molecular properties, structural elucidation and immunomodulatory activities
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Mehdi Tabarsa, SangGuan You, Elham Hashem Dabaghian, Utoomporn SurayotAbstractWater-soluble sulfated polysaccharides extracted from Ulva intestinalis and fractionated using DEAE Sepharose fast flow column to identify their molecular properties and macrophage cells stimulating activities. Crude and fractions (F1 and F2) were formed of neutral sugars (58.7–74.7%), sulfates (6.2–24.5%), uronic acids (4.9–5.9%) and proteins (3.2–10.4%). Different levels of sugar constituents including rhamnose (30.1–39.1%), glucose (39...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Relative content of gallic acid over 5-galloylquinic acid as an index for the baking intensity of oolong teas
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Miki Mei-Chi Wang, Yun Yeh, Yu-En Shih, Jason Tze-Cheng TzenAbstractPhenolic compounds in a series of old oolong teas prepared by baking annually were monitored and compared. The results showed that the relative content of gallic acid over 5-galloylquinic acid was subsequently elevated during this preparatory process. To reveal the effect was mainly resulted from baking or aging, two sets of oolong teas were collected and examined; one set was generated from fresh oolong tea via continually daily baking and the other set was...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Gallic acid inhibits bladder cancer cell proliferation and migration via regulating fatty acid synthase (FAS)
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Chung-Chia Liao, Shu-Chun Chen, Hui-Pei Huang, Chau-Jong WangAbstractBladder cancer is known as the world's ninth most prevalent cancer in 2012. New cytotoxic drugs have created considerable progress in the treatment. Gallic acid (GA) has been shown to inhibit carcinogenesis in animal models and various cancer cell lines. The aim of the present study was to evaluate the effect of GA on proliferation and migration inhibition of a bladder cancer cell line. The results showed that GA inhibited fatty acid synthase (FAS) activity...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Methodology for sample preparation and size measurement of commercial ZnO nanoparticles
This study discusses the strategies on sample preparation to acquire images with sufficient quality for size characterization by scanning electron microscope (SEM) using two commercial ZnO nanoparticles of different surface properties as a demonstration. The central idea is that micrometer sized aggregates of ZnO in powdered forms need to firstly be broken down to nanosized particles through an appropriate process to generate nanoparticle dispersion before being deposited on a flat surface for SEM observation. Analytical tools such as contact angle, dynamic light scattering and zeta potential have been utilized to optimize...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Modified QuEChERS method for 24 plant growth regulators in grapes using LC-MS/MS
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Chieh-Han Pu, Shao-Kai Lin, Wei-Chen Chuang, Tsyr-Horng ShyuAbstractA multiresidue analytical method was developed for grapes for the following 24 plant growth regulators: 1-naphthylacetamide, 2,3,5-triiodobenzoic acid, 2,4,5-T, 2-naphthoxyacetic acid, 3-indolylacetic acid, 4-(3-indolyl)-butyric acid, 4-chlorophenoxyacetic acid, 4-nitrophenol, 6-benzylaminopurine, N6-isopentenyladenine, butralin, chlormequat chloride, chlorphonim-Cl, cloprop, forchlorfenuron, gibberellic acid 3, gibberellic acid 4, gibberellic acid 7, inabe...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Silver nanoparticle biosynthesis by using phenolic acids in rice husk extract as reducing agents and dispersants
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Yee-Shing Liu, Yung-Chung Chang, Hui-Huang ChenAbstractRice husk extract, obtained using acid and alkali pretreatment extraction (AAPE), contains bioactive compounds and exhibits reducing abilities. Phenolic composition in rice husk extract was analyzed and the mechanism of silver nanoparticle (AgNP) biosynthesis by using AAPE rice husk extract was investigated in this study. Stable and spherically shaped AgNPs with a size of <15Â nm were prepared under the following conditions: 0.001Â M AgNO3, AAPE rice husk extract dil...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
An investigation of the olive phenols activity as a natural medicine
In this study, the single components of the phenolic fraction of olive oil (1,4-hydroquinone, Semiquinone and 1,4-benzoquinone) have been studied as theoretical by using DFT (Density functional Theory). The behaviors of phenolic compounds of olive against to the alkyl peroxy radicals were investigated. Our data show that 1,4-benzoquinone is the best electron transfer agent in primary metabolic processes to human life. The frontier orbital gap, namely HOMO (highest occupied molecular orbital)–LUMO (lowest unoccupied molecular orbital) gap is the smallest for 1,4-benzoquinone. Hence, it is more stable than the others in bl...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Pt-MWCNT modified carbon electrode strip for rapid and quantitative detection of H2O2 in food
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Tai-Cheng Chou, Kai-Yu Wu, Fu-Xiang Hsu, Cheng-Kang LeeAbstractA single-use screen-printed carbon electrode strip was designed and fabricated. Nanohybrids, prepared by deposition of platinum (Pt) nanoparticles on multi-wall carbon nanotube (MWCNT), was modified on the surface of screen-printed carbon electrode for the development of a fast, sensitive and cost-effective hydrogen peroxide (H2O2) detection amperometric sensor strip. With Pt-MWCNT nanohybrids surface modification, current generated in response to H2O2 by the scr...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Determination of total mercury in seafood by ion-selective electrodes based on a thiol functionalized ionic liquid
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Juan Miao, Xin Wang, Yunchang Fan, Jing Li, Lina Zhang, Guitao Hu, Can He, Can JinAbstractA mercury(II) ion-selective electrode with an ionic liquid (IL), 1-methyl-2-butylthioimidazolium bis(trifluoromethanesulphonyl)imide ([C1C4Sim]NTf2) as active material was constructed. Parameters affecting the performance of the electrodes such as the dosages of the IL and carbon nanotubes and the aqueous pH values were investigated. Experimental results indicated that the optimal composition of the electrode filling material was 47.6% ...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Characteristics of fucose-containing polysaccharides from submerged fermentation of Agaricus blazei Murill
In this study, we characterized bioactive fucose-containing acidic polysaccharides from submerged fermentation of Agaricus blazei Murill. We obtained the polysaccharides through a cell-based activity-guided strategy, and used carbohydrate recognition monoclonal antibodies based Enzyme-Linked Immuno Sorbent Assay (ELISA) along with methylation and NMR analyses to investigate the structural characteristics of the polysaccharides. The polysaccharides had Mw of 3.5 × 105 Da. The major sugars were l-fucose, l-arabinose, d-galactose, d-xylose, and d-galacturonic acid in the molar ratio of 6.4, 15.5, 28.5, 14.7, and 25.0% wit...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
HPTLC-FLD-SERS as a facile and reliable screening tool: Exemplarily shown with tyramine in cheese
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Liao Wang, Xue-Ming Xu, Yi-Sheng Chen, Jie Ren, Yun-Tao LiuAbstractThe serious cytotoxicity of tyramine attracted marked attention as it induced necrosis of human intestinal cells. This paper presented a novel and facile high performance thin-layer chromatography (HPTLC) method tailored for screening tyramine in cheese. Separation was performed on glass backed silica gel plates, using methanol/ethyl acetate/ammonia (6/4/1 v/v/v) as the mobile phase. Special efforts were focused on optimizing conditions (substrate preparation...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
Production of antioxidant and ACE-inhibitory peptides from Kluyveromyces marxianus protein hydrolysates: Purification and molecular docking
Publication date: April 2018Source: Journal of Food and Drug Analysis, Volume 26, Issue 2Author(s): Mahta Mirzaei, Saeed Mirdamadi, Mohamad Reza Ehsani, Mahmoud AminlariAbstractKluyveromyces marxianus protein hydrolysates were prepared by two different sonicated-enzymatic (trypsin and chymotrypsin) hydrolysis treatments to obtain antioxidant and ACE-inhibitory peptides. Trypsin and chymotrypsin hydrolysates obtained by 5Â h, exhibited the highest antioxidant and ACE-inhibitory activities. After fractionation using ultrafiltration and reverse phase high performance liquid chromatography (RP-HPLC) techniques, two new peptide...
Source: Journal of Food and Drug Analysis - July 5, 2018 Category: Food Science Source Type: research
