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https://www.readbyqxmd.com/read/28335356/refinement-of-magnetite-nanoparticles-by-coating-with-organic-stabilizers
#1
Monica Cîrcu, Alexandrina Nan, Gheorghe Borodi, Jürgen Liebscher, Rodica Turcu
Magnetite nanoparticles are of great importance in nanotechnology and nanomedicine and have found manifold applications. Here, the effect of coating of magnetite nanoparticles with organic stabilizers, such as O-phosphoryl ethanolamine, glycerol phosphate, phospho-l-ascorbic acid, phospho-d,l-serine, glycolic acid, lactic acid, d,l-malic acid, and d,l-mandelic acid was studied. Remarkably, this procedure led to an improvement of saturation magnetization in three cases rather than to an unfavorable decrease as usually observed...
November 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28324818/exogenous-malic-acid-alleviates-cadmium-toxicity-in-miscanthus-sacchariflorus-through-enhancing-photosynthetic-capacity-and-restraining-ros-accumulation
#2
Haipeng Guo, Houming Chen, Chuntao Hong, Dean Jiang, Bingsong Zheng
Malic acid (MA) plays an important role in the regulation of plant growth, stomatal aperture, nutrition elements homeostasis and toxic metals tolerance. However, little is known about the effects of exogenous MA on physiological and biochemical responses to toxic metals in plants. To measure the alleviation roles of exogenous MA against cadmium (Cd), we determined the effects of MA on plant growth, net photosynthetic rate (Pn), reactive oxygen species (ROS) accumulation and the activities of anti-oxidant enzymes in the leaves of Miscanthus sacchariflorus (M...
March 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28323450/effect-of-wetland-plants-and-bacterial-inoculation-on-dissipation-of-phenanthrene
#3
Weisong Pan, Chuan Wu, Qiming Wang, Zhaohong Su, Hui Zhou, Anna King Chuen Chung, William Hartley, Long Ge
This study attempts to evaluate the capacity of wetland plants' ability to dissipate phenanthrene (PHE) under waterlogged conditions. The results indicate that Typha latifolia and Vertiveria zizanioides may efficiently degrade PHE, and were much more effective when under combined plant cultivation with the inoculation of Pseudomonas frederiksbergensis (ATCC BAA-257). Concentrations of PHE declined from 200 mg kg(-1) to less than 52 mg kg(-1) in all treatments with plant cultivation. At the end of the experimental period, PHE was undetectable in combined plant cultivation in the presence of bacteria inoculation...
March 21, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28322320/sweet-taste-in-apple-the-role-of-sorbitol-individual-sugars-organic-acids-and-volatile-compounds
#4
Eugenio Aprea, Mathilde Charles, Isabella Endrizzi, Maria Laura Corollaro, Emanuela Betta, Franco Biasioli, Flavia Gasperi
Sweetness is one of the main drivers of consumer preference, and thus is given high priority in apple breeding programmes. Due to the complexity of sweetness evaluation, soluble solid content (SSC) is commonly used as an estimation of this trait. Nevertheless, it has been demonstrated that SSC and sweet taste are poorly correlated. Though individual sugar content may vary greatly between and within apple cultivars, no previous study has tried to investigate the relationship between the amount of individual sugars, or ratios of these, and apple sweetness...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317715/evaluation-of-penicillium-expansum-for-growth-patulin-accumulation-nonvolatile-compounds-and-volatile-profile-in-kiwi-juices-of-different-cultivars
#5
Yuan Wang, Tingting Shan, Yahong Yuan, Zhiwei Zhang, Chunfeng Guo, Tianli Yue
Patulin (PAT) contamination and changes of nonvolatile and volatile compounds caused by Penicillium expansum in fresh juices of 8 kiwi cultivars were investigated. Growth and PAT production of P. expansum were greater at 25°C than at 4°C. P. expansum grew in kiwi juices under pH ranging from 2.75 to 3.27 and produced 45.10-268.88μg/mL of PAT at 25°C. Decreases occurred in malic acid and soluble protein; while consumption and production simultaneously happened for reducing sugar, total soluble solid, titratable acid, citric acid, ascorbic acid and total phenolics...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28317705/comparison-of-old-cherry-cultivars-grown-in-czech-republic-by-chemical-composition-and-bioactive-compounds
#6
Agnieszka Nawirska-Olszańska, Joanna Kolniak-Ostek, Maciej Oziembłowski, Alena Ticha, Radomir Hyšpler, Zdenek Zadak, Pavla Židová, Frantisek Paprstein
Sweet cherry fruits are readily consumed by humans, and they contain significant quantities of bioactive compounds. Fifteen sweet cherry (Prunus avium L.) old cultivars grown in the Czech Republic were examined. In fresh fruits the contents of sugars, organic acids, and phenolic compounds, and antioxidant capacity were determined. The analyses showed that the fruits of sweet cherry are characterized by high contents of bioactive compounds. Four organic acids - malic, quinic, shikimic, and fumaric acid - were determined in examined fruits...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28290294/behavior-of-yeast-inoculated-during-semi-dry-coffee-fermentation-and-the-effect-on-chemical-and-sensorial-properties-of-the-final-beverage
#7
Luciana Silva Ribeiro, Maria Gabriela da Cruz Pedrozo Miguel, Suzana Reis Evangelista, Pamela Mynsen Machado Martins, Joshua van Mullem, Maisa Honorio Belizario, Rosane Freitas Schwan
Pulped Mundo Novo and Ouro Amarelo coffee beans were inoculated with Saccharomyces cerevisiae (CCMA 0200 and CCMA 0543) during semi-dry coffee fermentation and compared with a non-inoculated control. Samples were collected throughout the fermentation process (12days) to evaluate the persistence of the inoculum by Real-Time quantitative PCR (qPCR). Also, the chemical composition of the beans was determined by HPLC and GC-MS and the roasted beans were sensorial evaluated using the cupping test. S. cerevisiae CCMA 0543 had an average population of 5...
February 2017: Food Research International
https://www.readbyqxmd.com/read/28288640/overexpression-of-a-c4-dicarboxylate-transporter-is-the-key-for-rerouting-citric-acid-to-c4-dicarboxylic-acid-production-in-aspergillus-carbonarius
#8
Lei Yang, Eleni Christakou, Jesper Vang, Mette Lübeck, Peter Stephensen Lübeck
BACKGROUND: C4-dicarboxylic acids, including malic acid, fumaric acid and succinic acid, are valuable organic acids that can be produced and secreted by a number of microorganisms. Previous studies on organic acid production by Aspergillus carbonarius, which is capable of producing high amounts of citric acid from varieties carbon sources, have revealed its potential as a fungal cell factory. Earlier attempts to reroute citric acid production into C4-dicarboxylic acids have been with limited success...
March 14, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28277656/biologically-safe-poly-l-lactic-acid-blends-with-tunable-degradation-rate-microstructure-degradation-mechanism-and-mechanical-properties
#9
Hideko T Oyama, Daisuke Tanishima, Ryohei Ogawa
Although poly(L-lactic acid) (PLLA) is reputed to be biodegradable in the human body, its hydrophobic nature lets it persist for ca. 5.5 years. This study demonstrates that biologically safe lactide copolymers, poly(aspartic acid-co-L-lactide) (PAL) and poly(malic acid-co-L-lactide) (PML), dispersed in the PLLA function as detonators (triggers) for its hydrolytic degradation at physiological conditions. The copolymers significantly enhance hydrolysis and consequently the degradation rate of PLLA becomes easily tunable by controlling the amounts of PAL and PML...
March 9, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28276764/phenolic-compounds-from-bletilla-striata
#10
Li-Ning Wang, Yong-Zhi He, Qi-Duo Zhao, Yan-Ru Deng, Pei-Qian Wu, Yan-Jun Zhang
Two new malic acid derivatives, namely eucomic acid 1-methyl ester (2) and 6'''-acetylmilitaline (7), together with ten known compounds (1, 3-6, 8-12), were isolated from the dry tubers of Bletilla striata (Thunb.) Reichb. F., a perennial traditional Chinese medicinal herb, which was used for the treatment of pneumonophthisis, pneumonorrhagia, tuberculosis, and hemorrhage of the stomach or lung. Their structures were elucidated by spectroscopic analyses, including 1D-, 2D-NMR, and HR-ESI-MS.
February 17, 2017: Journal of Asian Natural Products Research
https://www.readbyqxmd.com/read/28276560/development-of-a-dye-molecule-biocatalyst-hybrid-system-with-visible-light-induced-carbon-carbon-bond-formation-from-co2-as-a-feedstock
#11
Yutaka Amao, Shusaku Ikeyama, Takayuki Katagiri, Kohei Fujita
Recently, CO2 utilization technology, including artificial photosynthesis, has received much attention. In this field, CO2 is used as a feedstock for fuels, polymers and in other chemical processes. Of note are malic enzymes (MEs) which catalyze the reaction of malic acid to pyruvic acid and CO2 with the co-enzyme NADP(+), and catalyze the reverse reaction of pyruvic acid and CO2 to malic acid with the co-enzyme NADPH. Thus, MEs are also an attractive biocatalyst for carbon-carbon bond formation from CO2. Studies of the visible light-induced malic acid production from pyruvic acid and CO2 using an electron donor, a photosensitizer, an electron mediator, ferredoxin-NADP(+) reductase, NADP(+), and ME have been reported...
March 9, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28273510/effects-of-cadmium-resistant-fungi-aspergillus-aculeatus-on-metabolic-profiles-of-bermudagrass-cynodondactylon-l-pers-under-cd-stress
#12
Xiaoning Li, Margaret Mukami Gitau, Shijuan Han, Jinmin Fu, Yan Xie
Plants' tolerance to heavy metal stress may be induced by the exploitation of microbes. The objectives of this study were to investigate the effect of cadmium (Cd)-resistant fungus, Aspergillus aculeatus, on tolerance to Cd and alteration of metabolites in bermudagrass under Cd stress, and identify the predominant metabolites associated with Cd tolerance. Two genotypes of bermudagrass with contrasting Cd tolerance (Cd-sensitive 'WB92' and Cd-tolerant 'WB242') were exposed to 0, 50, 150 and 250 mg kg(-1) Cd for 21 days...
February 20, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28260346/mass-based-metabolomic-analysis-of-lactobacillus-sakei-and-its-growth-media-at-different-growth-phases
#13
Sang Bong Lee, Young Kyoung Rhee, Eun-Ji Gu, Dong-Wook Kim, Gwang-Ju Jang, Seong-Hwa Song, Jae-In Lee, Bo-Min Kim, Hyeon-Jeong Lee, Hee-Do Hong, Chang-Won Cho, Hyun-Jin Kim
Changes in the metabolite profiles of Lactobacillus sakei and its growth media, based on different culture times (0, 6, 12 and 24 h), were investigated using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-MS (LC-MS) with partial least squares discriminant analysis (PLS-DA), in order to understand the growth characteristics of this organism. Cell and media samples of L. sakei were significantly separated on PLS-DA score plots. Cell [28] and media [7] metabolites including sugars, amino acids, and organic acids were identified as major metabolites contributing to the difference among samples...
March 6, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28254010/preharvest-treatments-with-malic-oxalic-and-acetylsalicylic-acids-affect-the-phenolic-composition-and-antioxidant-capacity-of-coriander-dill-and-parsley
#14
Hussein El-Zaeddi, Ángel Calín-Sánchez, Paulina Nowicka, Juan Martínez-Tomé, Luis Noguera-Artiaga, Francisco Burló, Aneta Wojdyło, Ángel A Carbonell-Barrachina
The effects of a preharvest treatment with malic (MA), oxalic (OA), or acetylsalicylic (ASA) acid at three concentrations (1, 2 and 3mM) on the bioactivity and antioxidant capacity of coriander, dill, and parsley were investigated. The antioxidant capacity of the herbs extracts was assayed by spectrophotometric methods by using three different analytical methods: ORAC, FRAP, and ABTS; the effects of treatments were very positive in coriander, produced intermediate results in dill, and no effects were found in parsley plants...
July 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28238266/impact-of-fluorescent-lighting-on-oxidation-of-model-wine-solutions-containing-organic-acids-and-iron
#15
Paris Grant-Preece, Celia Barril, Leigh M Schmidtke, Andrew C Clark
Previous studies have provided evidence that light exposure can increase oxygen consumption in wine and that the photodegradation of iron(III) tartrate could contribute to this process. In the present study, model wine solutions containing iron(III) and various organic acids, either alone or combined, were stored in sealed clear glass wine bottles and exposed to light from fluorescent lamps. Dissolved oxygen was monitored, and afterward the organic acid degradation products were determined and the capacity of the solutions to bind sulfur dioxide, the main wine preservative, was assessed...
March 9, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28229207/engineering-rtca-pathway-and-c4-dicarboxylate-transporter-for-l-malic-acid-production
#16
Xiulai Chen, Yuancai Wang, Xiaoxiang Dong, Guipeng Hu, Liming Liu
L-Malic acid is an important component of a vast array of food additives, antioxidants, disincrustants, pharmaceuticals, and cosmetics. Here, we presented a pathway optimization strategy and a transporter modification approach to reconstruct the L-malic acid biosynthesis pathway and transport system, respectively. First, pyruvate carboxylase (pyc) and malate dehydrogenase (mdh) from Aspergillus flavus and Rhizopus oryzae were combinatorially overexpressed to construct the reductive tricarboxylic acid (rTCA) pathway for L-malic acid biosynthesis...
February 22, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28221961/synergistic-antilisterial-effects-of-mixtures-of-lysozyme-and-organic-acids
#17
Myeonggeun Oh, Joongjae Lee, Yoonhwa Jeong, Misook Kim
We investigated the synergistic effects of lysozyme combined with organic acids to inhibit the growth of Listeria monocytogenes . The antilisterial effects of the combination of lysozyme and acetic acid, citric acid, lactic acid, malic acid, or succinic acid were evaluated using the checkerboard method and time-kill assay. The MIC was 25,000 mg/liter for lysozyme, 625 mg/liter for acetic acid, and 1,250 mg/liter for the other acids. The MBC was 10,000 mg/liter for all of the tested organic acids. The combination of lysozyme and each organic acid showed synergistic effects via the checkerboard method; however, the time-kill assay showed synergistic effects for only three combinations of 1,250 mg/liter lysozyme with succinic acid (312 and 625 mg/liter) or malic acid (625 mg/liter)...
December 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28199009/influence-of-different-yeast-lactic-acid-bacteria-combinations-on-the-aromatic-profile-of-red-bordeaux-wine
#18
Marine Gammacurta, Stéphanie Marchand, Virginie Moine, Gilles de Revel
BACKGROUND: The typical fruity aroma of red Bordeaux wines depends on the grape variety but also on microbiological processes, such as alcoholic and malolactic fermentations. These transformations involve respectively the yeast Saccharomyces cerevisiae and the lactic acid bacteria Oenococcus oeni. Both species play a central role in red winemaking but their quantitative and qualitative contribution to the revelation of the organoleptic qualities of wine has not yet been fully described...
February 15, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28193406/variation-of-ascorbic-acid-concentration-in-fruits-of-cultivated-and-wild-apples
#19
Ting Fang, Qiaoling Zhen, Liao Liao, Albert Owiti, Li Zhao, Schuyler S Korban, Yuepeng Han
Ascorbic acid (AsA) content in mature fruits of 457 apple accessions were measured, and a great variation in AsA concentration was detected. Wild fruits showed significantly higher level of AsA than cultivated fruits. Fruit AsA content was positively correlated with malic acid content, but negatively correlated with fruit weight and soluble solid content. Thus, the difference in AsA content between the wild and cultivated fruits could be attributed to an indirect consequence of human selection for larger fruit size, less acidity, and increased sweetness during apple domestication...
June 15, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28191939/phytochemical-profiles-of-new-red-fleshed-apple-varieties-compared-with-traditional-and-new-white-fleshed-varieties
#20
David Bars-Cortina, Alba Macià, Ignasi Iglesias, Maria Paz Romero, Maria José Motilva
This study is an exhaustive chemical characterization of the phenolic compounds, triterpenes, and organic and ascorbic acids in red-fleshed apple varieties obtained by different breeding programs and using five traditional and new white-fleshed apple cultivars as reference. To carry out these analyses, solid-liquid extraction (SLE) and ultraperformance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) were used. The results showed that the red-fleshed apples contained, in either the flesh or peel, higher amounts of phenolic acids (chlorogenic acid), anthocyanins (cyanidin-3-O-galactoside), dihydrochalcones (phloretin xylosyl glucoside), and organic acids (malic acid) but a lower amount of flavan-3-ols than the white-fleshed apples...
February 13, 2017: Journal of Agricultural and Food Chemistry
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