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ascorbic acid

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https://www.readbyqxmd.com/read/29350728/dual-chain-extension-effect-and-antibacterial-properties-of-biomolecules-interleaved-within-ldh-dispersed-into-pbs-by-in-situ-polymerization
#1
Grazia Totaro, Laura Sisti, Annamaria Celli, Irene Aloisio, Diana Di Gioia, Adam A Marek, Vincent Verney, Fabrice Leroux
Nanocomposites based on poly(butylene succinate) (PBS) and hydrotalcite-type anionic clays (HTs) organo-modified with biomolecules characterized by antibacterial and/or antioxidant activities, such as l-ascorbic acid (ASA), phloretic acid (HPP), l-tyrosine (TYR) and l-tryptophan (TRP), have been prepared by in situ polymerization. From XRD analysis and rheology experiments in a molten polymer state, intercalated HT hybrid platelets acting here as a hybrid filler are found to be well dispersed into polymers while providing a chain extension effect on PBS...
January 19, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29350476/investigating-the-mechanisms-underlying-phytoprotection-by-plant-growth-promoting-rhizobacteria-in-spartina-densiflora-under-metal-stress
#2
K Paredes-Páliz, R Rodríguez-Vázquez, B Duarte, M A Caviedes, E Mateos-Naranjo, S Redondo-Gómez, Isabel Caçador, Ignacio D Rodríguez-Llorente, E Pajuelo
Pollution of coasts by toxic metals and metalloids is a worldwide problem for which phytoremediation using halophytes and associated microbiomes is getting relevance. Metal(loid)s excess is a constraint for plant establishment and development, and plant growth promoting rhizobacteria (PGPR) mitigate plant stress under these conditions. However, mechanisms underlying this effect remain elusive. In this paper, the effect of toxic metal(loid)s on the activity of ROS-scavenging enzymes in roots of the halophyte Spartina densiflora grown on real polluted sediments in a green house experiment, was investigated...
January 19, 2018: Plant Biology
https://www.readbyqxmd.com/read/29350007/-the-metabolic-profilings-study-of-serum-and-spinal-cord-from-acute-spinal-cord-injury-rats-%C3%A2-h-nmr-spectroscopy
#3
Hua-Hui Hu, Xiao-Long Huang, Ren-Fu Quan, Zong-Bao Yang, Jing-Jing Xu
OBJECTIVE: To establish the rat model of acute spinal cord injury, followed by aprimary study on this model with ¹H NMR based on metabonomics and to explore the metabonomics and biomarkers of spinal cord injury rat. METHODS: Twenty eight-week-old adult male SD rats of clean grade, with body weight of (200±10) g, were divided into sham operation group and model group in accordance with the law of random numbers, and every group had 10 rats. The rats of sham operation group were operated without damaging the spinal cord, and rats of model group were made an animal model of spinal cord incomplete injury according to the modified Allen's method...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29349577/combination-therapy-with-sulfasalazine-and-valproic-acid-promotes-human-glioblastoma-cell-death-through-imbalance-of-the-intracellular-oxidative-response
#4
Carlos Gustavo Garcia, Suzana Assad Kahn, Luiz Henrique Medeiros Geraldo, Igor Romano, Ivan Domith, Deborah Christinne Lima E Silva, Fernando Dos Santos Assunção, Marcos José Ferreira, Camila Cabral Portugal, Jorge Marcondes de Souza, Luciana Ferreira Romão, Annibal Duarte Pereira Netto, Flávia Regina Souza Lima, Marcelo Cossenza
Glioblastoma (GBM) is the most common and aggressive malignant primary brain tumor and still lacks effective therapeutic strategies. It has already been shown that old drugs like sulfasalazine (SAS) and valproic acid (VPA) present antitumoral activities in glioma cell lines. SAS has also been associated with a decrease of intracellular glutathione (GSH) levels through a potent inhibition of xc- glutamate/cystine exchanger leading to an antioxidant deprotection. In the same way, VPA was recently identified as a histone deacetylase (HDAT) inhibitor capable of activating tumor suppression genes...
January 19, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29348608/phytase-overexpression-in-arabidopsis-improves-plant-growth-under-osmotic-stress-and-in-combination-with-phosphate-deficiency
#5
Nibras Belgaroui, Benoit Lacombe, Hatem Rouached, Moez Hanin
Engineering osmotolerant plants is a challenge for modern agriculture. An interaction between osmotic stress response and phosphate homeostasis has been reported in plants, but the identity of molecules involved in this interaction remains unknown. In this study we assessed the role of phytic acid (PA) in response to osmotic stress and/or phosphate deficiency in Arabidopsis thaliana. For this purpose, we used Arabidopsis lines (L7 and L9) expressing a bacterial beta-propeller phytase PHY-US417, and a mutant in inositol polyphosphate kinase 1 gene (ipk1-1), which were characterized by low PA content, 40% (L7 and L9) and 83% (ipk1-1) of the wild-type (WT) plants level...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29345972/trypsin-inhibitors-from-cajanus-cajan-and-phaseolus-limensis-possess-antioxidant-anti-inflammatory-and-antibacterial-activity
#6
Tooba Naz Shamsi, Romana Parveen, Sumbul Afreen, Mudasser Azam, Priyankar Sen, Yamini Sharma, Qazi Mohd Rizwanul Haque, Tasneem Fatma, Nikhat Manzoor, Sadaf Fatima
Protease inhibitors are one of the most promising and investigated subjects for their role in pharmacognostic and pharmacological studies. This study aimed to investigate antioxidant, anti-inflammatory, and antimicrobial activities of trypsin inhibitors (TIs) from two plant sources (Cajanus cajan and Phaseolus limensis). TI was purified from C. cajan (PUSA-992) by ammonium sulfate precipitation followed by ion exchange chromatography. TI from Phaseolus limensis (lima bean trypsin inhibitor; LBTI) was procured from Sigma-Aldrich, St...
January 18, 2018: Journal of Dietary Supplements
https://www.readbyqxmd.com/read/29344958/protective-effects-of-new-antioxidant-compositions-of-4-methylcoumarins-and-related-compounds-with-dl-%C3%AE-tocopherol-and-l-ascorbic-acid
#7
Vessela D Kancheva, Adriana K Slavova-Kazakova, Silvia E Angelova, Prashant Kumar, Shashwat Malhotra, Brajendra K Singh, Luciano Saso, Ashok K Prasad, Virinder S Parmar
BACKGROUND: Coumarin derivatives possess a wide range of biological activities. By functionalization of the parent coumarin skeleton that has neither antioxidant nor biological activity a series of new bio-antioxidants has been designed. RESULTS: New antioxidant compositions (equimolar binary and ternary mixtures) of eight 4-methylcoumarins and three related compounds have been tested and different effects between the individual components have been observed: positive effect (synergism), summary effect (additivism) and negative effect (antagonism)...
January 18, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29344416/lycium-barbarum-a-traditional-chinese-herb-and-a-promising-anti-aging-agent
#8
REVIEW
Yanjie Gao, Yifo Wei, Yuqing Wang, Fang Gao, Zhigang Chen
Lycium barbarum has been used in China for more than 2,000 years as a traditional medicinal herb and food supplement. Lycium barbarum contains abundant Lycium barbarum polysaccharides (LBPs), betaine, phenolics, carotenoids (zeaxanthin and β-carotene), cerebroside, 2-O-β-d-glucopyranosyl-l-ascorbic acid (AA-2βG), β-sitosterol, flavonoids and vitamins (in particular, riboflavin, thiamine, and ascorbic acid). LBPs are the primary active components of Lycium barbarum. In this review, we discuss the pharmacological activities of LBPs and other major components...
December 2017: Aging and Disease
https://www.readbyqxmd.com/read/29343696/decoupled-in-plane-dipole-resonance-modulated-colorimetric-assay-based-optical-ruler-for-ultra-trace-gold-au-detection
#9
Ajoy Mandal, Maireyee Bhattacharya, Denis V Kuznetsov, Tapas Ghosh, Sudeshna Das Chakraborty, Biswarup Satpati, Vsevolod Mazov, Dulal Senapati
Decoupling of different plasmon resonance modes (in-plane, and out-of-plane dipole and quadrupole resonances) by tuning nanoparticle's size and shape offers a new field of plasmonics as colorimetric assay-based optical-ruler for ultra-trace sensing. Driven by its low cost, easy to perform and efficient way to measure trace level (up to 30 ppt in presence of common mining elements in natural gold ore) abundance, this study develops a highly selective and ultrasensitive turn-on colorimetric sensor to detect gold-ion from environmental samples...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29343057/a-cu-t1-sensor-for-versatile-analysis
#10
Mingling Dong, Wenshu Zheng, Yiping Chen, Bei Ran, Zhiyong Qian, Xingyu Jiang
Conventional magnetic sensors usually employ Fe-based magnetic materials as signal probes. In this work, we find that Cu(II) is also a useful longitudinal relaxation time (T1) signal-based magnetic probe. We adopt bathocuproinedisulfonic acid disodium salt hydrate (BCS) to chelate Cu(I) and form a stable Cu(I)-BCS complex in aqueous solution, and find the significant difference in T1 value of water protons between Cu(II) aqueous solution and Cu(I)-BCS complex aqueous solution. Redox reaction can convert Cu(II) to Cu(I) followed by the complexation of BCS, which results in apparent change of T1 that can serve as magnetic signal readout, which is the basis of this Cu-T1 sensor...
January 18, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29342928/protein-oxidation-and-sensory-quality-of-brine-injected-pork-loins-added-ascorbate-or-extracts-of-green-tea-or-mat%C3%A3-during-chill-storage-in-high-oxygen-modified-atmosphere
#11
Sisse Jongberg, Mari Ann Tørngren, Leif H Skibsted
Background: Ascorbate is often applied to enhance stability and robustness of brine-injected pork chops sold for retail, but may affect protein oxidation, while plant extracts are potential substitutes. Methods: Brine-injected pork chops (weight-gain ~12%, NaCl ~0.9%) prepared with ascorbate (225 ppm), green tea extract (25 ppm gallic acid equivalents (GAE)), or maté extract (25 ppm GAE) stored (5 °C, seven days) in high-oxygen atmosphere packaging (MAP: 80% O₂ and 20% CO₂) were analyzed for color changes, sensory quality, and protein oxidation compared to a control without antioxidant...
January 15, 2018: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/29340048/alteration-of-mitochondrial-biogenesis-promotes-disease-progression-in-multiple-myeloma
#12
Xin Zhan, Wenjie Yu, Reinaldo Franqui-Machin, Melissa L Bates, Kalyan Nadiminti, Huojun Cao, Brad A Amendt, Yogesh Jethava, Ivana Frech, Fenghuang Zhan, Guido Tricot
Many cancers, including multiple myeloma (MM), retain more cytosolic iron to promote tumor cell growth and drug resistance. Higher cytosolic iron promotes oxidative damage due to its interaction with reactive oxygen species generated by mitochondria. The variation of mitochondrial biogenesis in different stages of MM disease was evaluated using gene expression profiles in a large clinical dataset. Sixteen of 18mitochondrial biogenesis related gene sets, including mitochondrial biogenesis signature and oxidative phosphorylation, were increased in myeloma cells compared with normal plasma cells and high expression was associated with an inferior patient outcome...
December 19, 2017: Oncotarget
https://www.readbyqxmd.com/read/29339972/evaluation-of-green-tea-extract-as-a-safe-personal-hygiene-against-viral-infections
#13
Yun Ha Lee, Yo Han Jang, Young-Seok Kim, Jinku Kim, Baik Lin Seong
Background: Viral infections often pose tremendous public health concerns as well as economic burdens. Despite the availability of vaccines or antiviral drugs, personal hygiene is considered as effective means as the first-hand measure against viral infections. The green tea catechins, in particular, epigallocatechin-3-gallate (EGCG), are known to exert potent antiviral activity. In this study, we evaluated the green tea extract as a safe personal hygiene against viral infections. Results: Using the influenza virus A/Puerto Rico/8/34 (H1N1) as a model, we examined the duration of the viral inactivating activity of green tea extract (GTE) under prolonged storage at various temperature conditions...
2018: Journal of Biological Engineering
https://www.readbyqxmd.com/read/29339757/melatonin-increases-chilling-tolerance-in-postharvest-peach-fruit-by-alleviating-oxidative-damage
#14
Shifeng Cao, Jiarong Shao, Liyu Shi, Liwei Xu, Ziming Shen, Wei Chen, Zhenfeng Yang
Melatonin has been reported to alleviate chilling symptoms in postharvest peach fruit during cold storage, however, the mechanism involved is largely unknown. To better understand its role in chilling tolerance, here we investigated the effects of melatonin on oxidative damage in peach fruit subjected to chilling after harvest. Chilling injury of peaches was dramatically reduced by melatonin treatment. Melatonin induced hydrogen peroxide (H2O2) content at the early stage of storage but inhibited its accumulation thereafter...
January 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29339254/design-synthesis-biological-evaluation-and-docking-studies-of-new-3-4-5-dihydro-1h-pyrazol-isoxazol-5-yl-2-phenyl-1h-indole-derivatives-as-potent-antioxidants-and-15-lipoxygenase-inhibitors
#15
Haydi Saher ElBordiny, Mostafa Mahmoud El-Miligy, Shaymaa Emam Kassab, Hoda Daabees, Soad Abdelhamid Mohamed El-Hawash, Waleed Ali Mohamed Ali
New candidates of 3-(4,5-dihydro-1H-pyrazol/isoxazol-5-yl)-2-phenyl-1H-indole derivatives (4-7) were designed combining the pyrazoline/isoxazoline heterocycles and 2-phenylindole to explore its potential as 15-lipoxygenase (15-LOX) inhibitors. The design of the new derivatives was based on utilizing the antioxidant properties of pyrazoline, 2-phenylindole and the good 15-LOX inhibition properties of indolylpyrazoline. The derivatives were synthesized adopting simple and laboratory friendly reaction conditions to give the target compounds in quantitative yields...
January 10, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29337780/efficacy-and-safety-of-sodium-picosulfate-magnesium-citrate-for-bowel-preparation-in-a-physically-disabled-outpatient-population-a-randomized-endoscopist-blinded-comparison-with-ascorbic-acid-enriched-polyethylene-glycol-solution-plus-bisacodyl-the-pico-movi
#16
Elisabeth M H Mathus-Vliegen, Karin van der Vliet, Inge J Wignand-van der Storm, John S Stadwijk
BACKGROUND: Because of its volume, adequate bowel preparation remains problematic in physically unfit patients. OBJECTIVE: This study aimed to compare a small-volume sodium picosulfate/magnesium citrate preparation with a 2-L ascorbic acid-enriched polyethylene glycol solution plus bisacodyl. DESIGN: This study has a noninferiority design, assuming that ascorbic acid-enriched polyethylene glycol solution plus bisacodyl is 70% efficacious in achieving an Ottawa score ≤7 and accepting a difference in success rate of <15% with a target enrollment of 146 patients per group...
February 2018: Diseases of the Colon and Rectum
https://www.readbyqxmd.com/read/29337559/totally-organic-redox-active-ph-sensitive-nanoparticles-stabilized-by-amphiphilic-aromatic-polyketones
#17
Esteban Araya-Hermosilla, José Catalán-Toledo, Fabian Muñoz-Suescun, Felipe Oyarzun-Ampuero, Patrizio Raffa, Lorenzo Massimo Polgar, Francesco Picchioni, Ignacio Moreno-Villoslada
Amphiphilic aromatic polymers have been synthesized by grafting aliphatic polyketones with 4-(aminomethyl)benzoic acid at different molar ratios via the Paal-Knorr reaction. The resulting polymers, showing diketone conversion degree of 16, 37, 53, and 69 %, have been complexed with the redox-active 2,3,5-triphenyl-2H-tetrazolium chloride, precursor molecule with which aromatic-aromatic interactions are held. Upon addition of ascorbic acid to the complexes, in-situ reduction of the tetrazolium salt produced 1,3,5-triphenylformazan nanoparticles stabilized by the amphiphilic polymers...
January 16, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29337297/3d-hierarchical-ag-nanostructures-formed-on-poly-acrylic-acid-brushes-grafted-graphene-oxide-as-promising-sers-substrates
#18
Guoke Xing, Ke Wang, Ping Li, Wenqin Wang, Tao Chen
In this study, in situ generation of Ag nanostructure with different morphology on poly(acrylic acid) (PAA) brushes grafted graphene oxide (GO) as substrates for surface-enhanced Raman scattering (SERS) is demonstrated. The whole synthetic strategy involved the load of Ag precursor ions ((Ag+ and [Ag(NH3)2]+) in PAA brushes grafted GO, followed by their in situ reduction to Ag nanostructure with different morphology with a reducing agent (NaBH4 or ascorbic acid). Novel 3D hierarchical flowerlike Ag nanostructures could be obtained by using AgNO3 as precursors and ascorbic acid as a reducing agent...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29337067/the-impact-of-growth-factors-on-human-induced-pluripotent-stem-cells-differentiation-into-cardiomyocytes
#19
Marianne E Yassa, Iman A Mansour, Nadia I Sewelam, Hala Hamza, Taghrid Gaafar
Human induced pluripotent stem cells (hiPSCs) act as a promising therapeutic alternative for cardiovascular diseases. They yield a large number of functional cardiomyocytes (CMs) from autologous cell sources without ethical or immunological problems. However, significant limitations still remain in terms of line-to-line variability in CM yield and reproducibility. AIM: To efficiently enhance NP0040 hiPSCs differentiation into CMs. MAIN METHODS: Following a standard cardiac differentiation protocol using small molecules targeting the canonical Wnt signaling, growth factors (BMP4 and FGF2) and ascorbic acid were added further in order to increase the cardiac differentiation efficiency...
January 11, 2018: Life Sciences
https://www.readbyqxmd.com/read/29334833/silver-nanoparticles-induce-neurotoxicity-in-a-human-embryonic-stem-cell-derived-neuron-and-astrocyte-network
#20
Neza Repar, Hao Li, Jose S Aguilar, Qingshun Quinn Li, Damjana Drobne, Yiling Hong
Silver nanoparticles (AgNPs) are among the most extensively used nanoparticles and are found in a variety of products. This ubiquity leads to inevitable exposure to these particles in everyday life. However, the effects of AgNPs on neuron and astrocyte networks are still largely unknown. In this study, we used neurons and astrocytes derived from human embryonic stem cells as a cellular model to study the neurotoxicity that is induced by citrate-coated AgNPs (AgSCs). Immunostaining with the astrocyte and neuron markers, glial fibrillary acidic protein and microtubule-associated protein-2 (MAP2), respectively, showed that exposure to AgSCs at the concentration of 0...
January 15, 2018: Nanotoxicology
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