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https://www.readbyqxmd.com/read/27855895/dispersive-liquid-liquid-microextraction-based-on-solidification-of-floating-organic-drop-for-preconcentration-and-determination-of-trace-amounts-of-copper-by-flame-atomic-absorption-spectrometry
#1
Cennet Karadaş, Derya Kara
A novel, simple, rapid, sensitive, inexpensive and environmentally friendly dispersive liquid-liquid microextraction method based on the solidification of a floating organic drop (DLLME-SFO) was developed for the determination of copper by flame atomic absorption spectrometry (FAAS). N-o-Vanillidine-2-amino-p-cresol was used as a chelating ligand and 1-undecanol was selected as an extraction solvent. The main parameters affecting the performance of DLLME-SFO, such as sample pH, volume of extraction solvent, extraction time, concentration of the chelating ligand, salt effect, centrifugation time and sample volume were investigated and optimized...
April 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27853967/the-bioconcentration-ability-of-heavy-metal-research-for-50-kinds-of-rice-under-the-same-test-conditions
#2
Wen-Juan Xie, Lei Che, Guang-Yu Zhou, Li-Na Yang, Min-Yu Hu
The aims of this experiment are to explore the accumulation of metal contamination of different varieties of rice planted in paddy fields and to provide a basis for the further research. The rice specimens were grown in and collected from a total area of 8.24 acres of rice planting fields where local farmers cultivated 50 different kinds of rice. The crops were grown using the methods of seedling, transplanting, fertilizing, and irrigation, under the guidance of professional and technical personnel. The 50 kinds of paddy rice contain 20 kinds of conventional rice, 15 kinds of two-line hybrid rice, 15 kinds of three-line hybrid rice, and the whole experiment lasted 100 days...
December 2016: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/27833841/plant-growth-promotion-and-biofortification-of-chickpea-and-pigeonpea-through-inoculation-of-biocontrol-potential-bacteria-isolated-from-organic-soils
#3
Subramaniam Gopalakrishnan, Srinivas Vadlamudi, Srinivasan Samineni, C V Sameer Kumar
Seven strains of bacteria [Pseudomonas plecoglossicida SRI-156, Brevibacterium antiquum SRI-158, Bacillus altitudinis SRI-178, Enterobacter ludwigii SRI-211, E. ludwigii SRI-229, Acinetobacter tandoii SRI-305 and Pseudomonas monteilii SRI-360; demonstrated previously for control of charcoal rot disease in sorghum and plant growth-promotion (PGP) in rice] were evaluated for their PGP and biofortification traits in chickpea and pigeonpea under field conditions. When treated on seed, the seven selected bacteria significantly enhanced the shoot height and root length of both chickpea and pigeonpea over the un-inoculated control...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27822471/isolation-and-physicochemical-characterization-of-laccase-from-ganoderma-lucidum-cdbt1-isolated-from-its-native-habitat-in-nepal
#4
Prabin Shrestha, Bishnu Joshi, Jarina Joshi, Rajani Malla, Lakshmaiah Sreerama
At present, few organisms are known to and capable of naturally producing laccases and white rot fungi are one such group. In the present study, three fungal species, namely, Ganoderma lucidum-CDBT1, Ganoderma japonicum, and Lentinula edodes, isolated from their native habitat in Nepal were screened for laccase production, and G. lucidum-CDBT1 was found to express highest levels of enzyme (day 10 culture media showed 0.92 IU/mg total protein or 92 IU/mL laccase activity with ABTS as substrate). Lignin extracted from rice straw was used in Olga medium for laccase production and isolation from G...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27786355/effect-of-sulfur-containing-spices-on-the-bioaccessibility-of-trace-minerals-from-selected-cereals-and-pulses
#5
Meena Kumari, Kalpana Platel
BACKGROUND: Garlic and onion, rich in organo-sulfur compounds, are reported to enhance the bioaccessibility of Ca, Mg, Fe, and Zn; however, there is lack of similar information on the bioaccessibility of copper, manganese and chromium. Therefore, this study was undertaken to determine the effect of exogenous garlic and onion on the bioaccessibility of these trace minerals from selected food grains. The effect of two levels of garlic (0.25 and 0.5 g/10 g of grain) and onion (1.5 and 3 g/10 g of grain) on the bioaccessibility of these trace minerals from two representative cereals and pulses was determined by employing an in vitro dialysability procedure...
October 27, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27746792/genome-wide-identification-and-evolution-analysis-of-trehalose-6-phosphate-synthase-gene-family-in-nelumbo-nucifera
#6
Qijiang Jin, Xin Hu, Xin Li, Bei Wang, Yanjie Wang, Hongwei Jiang, Neil Mattson, Yingchun Xu
Trehalose-6-phosphate synthase (TPS) plays a key role in plant carbohydrate metabolism and the perception of carbohydrate availability. In the present work, the publicly available Nelumbo nucifera (lotus) genome sequence database was analyzed which led to identification of nine lotus TPS genes (NnTPS). It was found that at least two introns are included in the coding sequences of NnTPS genes. When the motif compositions were analyzed we found that NnTPS generally shared the similar motifs, implying that they have similar functions...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27733860/association-of-increased-grain-iron-and-zinc-concentrations-with-agro-morphological-traits-of-biofortified-rice
#7
Laura T Moreno-Moyano, Julien P Bonneau, José T Sánchez-Palacios, Joseph Tohme, Alexander A T Johnson
Biofortification of rice (Oryza sativa L.) with micronutrients is widely recognized as a sustainable strategy to alleviate human iron (Fe) and zinc (Zn) deficiencies in developing countries where rice is the staple food. Constitutive overexpression of the rice nicotianamine synthase (OsNAS) genes has been successfully implemented to increase Fe and Zn concentrations in unpolished and polished rice grain. Intensive research is now needed to couple this high-micronutrient trait with high grain yields. We investigated associations of increased grain Fe and Zn concentrations with agro-morphological traits of backcross twice second filial (BC2F2) transgenic progeny carrying OsNAS1 or OsNAS2 overexpression constructs under indica/japonica and japonica/japonica genetic backgrounds...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27713011/the-influence-of-metal-ions-on-the-dielectric-enhancement-and-radical-generation-of-rice-starch-during-microwave-processing
#8
Da-Ming Fan, Lu-Fen Lin, Li-Yun Wang, Lue-Lue Huang, Bo Hu, Xiao-Hong Gu, Jian-Xin Zhao, Hao Zhang
In this study, the effect of the enrichment of rice starch with metal ions on its capability to generate free radicals during microwave processing was investigated. The underlying mechanism was explored from two aspects: dielectric and thermal properties. Rice starch was modified with ions of iron, copper, manganese and calcium. The modified starches were analyzed in terms of dielectric properties, activation energy (Ea) and thermodynamic characteristics of gelatinization. The quantity and character of the free radicals were analyzed using electron paramagnetic resonance (EPR)...
October 3, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27636863/migration-of-copper-from-nanocopper-ldpe-composite-films
#9
Fang Liu, Chang-Ying Hu, Quan Zhao, Yu-Jie Shi, Huai-Ning Zhong
Three nanocopper/low-density polyethylene (LDPE) composite films were tested in food simulants (3% acetic acid and 10% ethanol) and real food matrices (rice vinegar, bottled water and Chinese liquor) to explore the behaviours of copper migration using ICP-OES and GFAAS. The effects of exposure time, temperature, nanocopper concentration and contact media on the release of copper from nanocopper/LDPE composite films were studied. It was shown that the migration of copper into 10% ethanol was much less than that into 3% acetic acid at the same conditions...
October 4, 2016: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/27633505/the-expression-of-heterologous-fe-iii-phytosiderophore-transporter-hvys1-in-rice-increases-fe-uptake-translocation-and-seed-loading-and-excludes-heavy-metals-by-selective-fe-transport
#10
Raviraj Banakar, Ána Alvarez Fernández, Javier Abadía, Teresa Capell, Paul Christou
Many metal transporters in plants are promiscuous, accommodating multiple divalent cations including some which are toxic to humans. Previous attempts to increase the iron (Fe) and zinc (Zn) content of rice endosperm by overexpressing different metal transporters have therefore led unintentionally to the accumulation of copper (Cu), manganese (Mn) and cadmium (Cd). Unlike other metal transporters, barley Yellow Stripe 1 (HvYS1) is specific for Fe. We investigated the mechanistic basis of this preference by constitutively expressing HvYS1 in rice under the control of the maize ubiquitin1 promoter and comparing the mobilization and loading of different metals...
September 16, 2016: Plant Biotechnology Journal
https://www.readbyqxmd.com/read/27582750/analysis-of-copper-binding-proteins-in-rice-radicles-exposed-to-excess-copper-and-hydrogen-peroxide-stress
#11
Hongxiao Zhang, Yan Xia, Chen Chen, Kai Zhuang, Yufeng Song, Zhenguo Shen
Copper (Cu) is an essential micronutrient for plants, but excess Cu can inactivate and disturb the protein function due to unavoidable binding to proteins at the cellular level. As a redox-active metal, Cu toxicity is mediated by the formation of reactive oxygen species (ROS). Cu-binding structural motifs may alleviate Cu-induced damage by decreasing free Cu(2+) activity in cytoplasm or scavenging ROS. The identification of Cu-binding proteins involved in the response of plants to Cu or ROS toxicity may increase our understanding the mechanisms of metal toxicity and tolerance in plants...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27579012/nutritional-value-and-proteases-of-lentinus-citrinus-produced-by-solid-state-fermentation-of-lignocellulosic-waste-from-tropical-region
#12
Ana Rita Gaia Machado, Maria Francisca Simas Teixeira, Larissa de Souza Kirsch, Maria da Conceição Loureiro Campelo, Ila Maria de Aguiar Oliveira
This paper examined the growth and yield performance of Lentinus citrinus on cupuaçu exocarp (Theobroma grandiflorum) mixed with litter (CE + LI) or rice bran (Oryza sativa) (CE + RB) in the ratio of 2:1 (800 g:200 g) to investigate the nutritional composition and proteolytic potential of the fruiting body produced. Significance values of yield were determined on substrate combinations. In CE + LI the biological efficiency of the mushrooms was 93.5% and the content of fat (4.5%), fiber (11.0%), protein (27...
September 2016: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/27565297/biosorption-using-chitosan-thiourea-polymer-as-an-extraction-and-preconcentration-technique-for-copper-prior-to-its-determination-in-environmental-and-food-samples-by-flame-atomic-absorption-spectrometry-synthesis-characterization-and-analytical-applications
#13
H M Al-Saidi
The present work describes the synthesis and use of the chitosan thiourea polymer (CT polymer) as a novel biosorbent for copper preconcentration prior to its determination by flame atomic absorption spectrometry (FAAS). CT polymer submitted in the present study was synthesized by the direct reaction between chitosan isolated from penaeus monodon chitin and ammonium thiocyanate, then the chemical structure and morphology of polymer were investigated by spectroscopic measurements, thermal analysis, X-ray diffraction (XRD) and scanning electron microscope (SEM)...
August 24, 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27507507/effects-of-germination-and-high-hydrostatic-pressure-processing-on-mineral-elements-amino-acids-and-antioxidants-in-vitro-bioaccessibility-as-well-as-starch-digestibility-in-brown-rice-oryza-sativa-l
#14
Qiang Xia, Liping Wang, Congcong Xu, Jun Mei, Yunfei Li
The effects of germination and high hydrostatic pressure (HHP) processing on the in vitro bioaccessibility of mineral elements, amino acids (AAs), antioxidants and starch in brown rice (BR) were investigated. Germinated BR (GBR) was obtained by incubating at 37°C for 36h and then subjected to HHP treatments at 0.1, 100, 300 and 500MPa for 10min. The in vitro bioaccessibility of calcium and copper was increased by 12.59-52.17% and 2.87-23.06% after HHP, respectively, but bioaccessible iron was decreased. In addition, HHP significantly improved individual AAs, particularly indispensable AAs and gama-aminobutyric acid, as well as bioaccessible total antioxidant activities and starch resistance to enzymatic hydrolysis...
January 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27499219/rice-oryza-sativa-laccases-involved-in-modification-and-detoxification-of-herbicides-atrazine-and-isoproturon-residues-in-plants
#15
Meng Tian Huang, Yi Chen Lu, Shuang Zhang, Fang Luo, Hong Yang
Atrazine (ATR) and isoproturon (IPU) as herbicides have become serious environmental contaminants due to their overuse in crop production. Although ATR and IPU in soils are easily absorbed by many crops, the mechanisms for their degradation or detoxification in plants are poorly understood. This study identified a group of novel genes encoding laccases (EC 1.10.3.2) that are possibly involved in catabolism or detoxification of ATR and IPU residues in rice. Transcriptome profiling shows at least 22 differentially expressed laccase genes in ATR/IPU-exposed rice...
August 24, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27388982/heavy-metals-and-essential-elements-in-italian-cereals
#16
P Brizio, A Benedetto, S Squadrone, A Curcio, M Pellegrino, M Ferrero, M C Abete
Crops intended for human nutrition and food production containing different essential trace elements, such as copper and zinc, could be contaminated by toxic metals like cadmium and lead. The inter-relationship between micro-nutrients and contaminant trace elements in different cereals was investigated in North-western Italy, where both agricultural and industrial activities are present. Elemental concentrations in sampled cereals were assessed by inductively coupled plasma mass spectrometry (ICP-MS). Rice, oats and barley reached the highest median levels for Al, Cd and Pb content, while corn samples were less contaminated by toxic metals...
July 8, 2016: Food Additives & Contaminants. Part B, Surveillance
https://www.readbyqxmd.com/read/27387148/a-heavy-metal-p-type-atpase-oshma4-prevents-copper-accumulation-in-rice-grain
#17
Xin-Yuan Huang, Fenglin Deng, Naoki Yamaji, Shannon R M Pinson, Miho Fujii-Kashino, John Danku, Alex Douglas, Mary Lou Guerinot, David E Salt, Jian Feng Ma
Rice is a major source of calories and mineral nutrients for over half the world's human population. However, little is known in rice about the genetic basis of variation in accumulation of copper (Cu), an essential but potentially toxic nutrient. Here we identify OsHMA4 as the likely causal gene of a quantitative trait locus controlling Cu accumulation in rice grain. We provide evidence that OsHMA4 functions to sequester Cu into root vacuoles, limiting Cu accumulation in the grain. The difference in grain Cu accumulation is most likely attributed to a single amino acid substitution that leads to different OsHMA4 transport activity...
2016: Nature Communications
https://www.readbyqxmd.com/read/27376465/in-vitro-antioxidant-activity-of-rice-protein-affected-by-alkaline-degree-and-gastrointestinal-protease-digestion
#18
Ye Liu, Zhengxuan Wang, Hui Li, Mingcai Liang, Lin Yang
BACKGROUND: To elucidate whether and how alkali treatment, which is a common process for rice protein (RP) extraction, affects antioxidant activity of RP, the different degree of alkali (from 0.1% to 0.4% of NaOH) was used to extract RP (RP-1, RP-2, RP-3, RP-4). RESULTS: The antioxidant capacities of scavenging free radicals (2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt, ABTS; 1,1-diphenyl-2-picrylhydrazyl, DPPH), chelating metals (iron, copper) and reducing power investigated in the hydrolysates of RPs (RP-1, RP-2, RP-3, RP-4) during in vitro pepsin-pancreatin digestion were effectively affected by alkali treatment...
July 4, 2016: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/27264699/effect-of-bamboo-and-rice-straw-biochars-on-the-mobility-and-redistribution-of-heavy-metals-cd-cu-pb-and-zn-in-contaminated-soil
#19
Kouping Lu, Xing Yang, Gerty Gielen, Nanthi Bolan, Yong Sik Ok, Nabeel Khan Niazi, Song Xu, Guodong Yuan, Xin Chen, Xiaokai Zhang, Dan Liu, Zhaoliang Song, Xingyuan Liu, Hailong Wang
Biochar has emerged as an efficient tool to affect bioavailability of heavy metals in contaminated soils. Although partially understood, a carefully designed incubation experiment was performed to examine the effect of biochar on mobility and redistribution of Cd, Cu, Pb and Zn in a sandy loam soil collected from the surroundings of a copper smelter. Bamboo and rice straw biochars with different mesh sizes (<0.25 mm and <1 mm), were applied at three rates (0, 1, and 5% w/w). Heavy metal concentrations in pore water were determined after extraction with 0...
June 2, 2016: Journal of Environmental Management
https://www.readbyqxmd.com/read/27121017/immobilization-of-pb-and-cu-in-polluted-soil-by-superphosphate-multi-walled-carbon-nanotube-rice-straw-and-its-derived-biochar
#20
Muhammad Shahid Rizwan, Muhammad Imtiaz, Guoyong Huang, Muhammad Afzal Chhajro, Yonghong Liu, Qingling Fu, Jun Zhu, Muhammad Ashraf, Mohsin Zafar, Saqib Bashir, Hongqing Hu
Lead (Pb) and copper (Cu) contamination in croplands pose severe health hazards and environmental concerns throughout soil-food chain transfer. In the present study, BCR, TCLP, CaCl2, and SBET techniques were employed to evaluate the simultaneous effectiveness of rice straw (RS) and its derived biochar (BC), multiwall carbon nanotube (MWCNT), and single superphosphate (SSP) to immobilize the Pb and Cu in co-contaminated soil. The BCR sequential extraction results suggested that with increasing BC and SSP amount, the acid-soluble fractions decreased while oxidizable and residual proportions of Pb and Cu were increased significantly...
August 2016: Environmental Science and Pollution Research International
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