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https://www.readbyqxmd.com/read/29442047/comprehensive-phytochemical-characterization-of-st-john-s-wort-hypericum-perforatum-l-oil-macerates-obtained-by-different-extraction-protocols-via-analytical-tools-applicable-in-routine-control
#1
M Heinrich, R Daniels, F C Stintzing, D R Kammerer
The aim of the present study was to investigate the impact of crucial process parameters, i.e. of light and temperature conditions, during the preparation of St. John's wort (SJW, Hypericum perforatum L.) Arachis oil macerates. Extracts were prepared according to a standardized protocol over a period of 28 days. For this purpose, flowering tops of H. perforatum were macerated with Arachis oil (drug extract ratio, DERnative 1:4) under different light and temperature conditions. Spectrophotometric measurements were carried out to quantitate naphthodianthrones and to characterize extract color in the CIE L*C*h° system...
March 1, 2017: Die Pharmazie
https://www.readbyqxmd.com/read/29433258/hplc-dad-apci-esi-msn-analysis-of-carotenoids-and-%C3%AE-tocopherol-in-costa-rican-acrocomia-aculeata-fruits-of-varying-maturity-stages
#2
Roland Schex, Veronika M Lieb, Víctor M Jiménez, Patricia Esquivel, Ralf M Schweiggert, Reinhold Carle, Christof B Steingass
Carotenoids and tocopherols were characterised in the meso- and exocarp of wild-growing Costa Rican Acrocomia aculeata fruits. Comprehensive profiling of these lipophilic micronutrients in fruits of three varying maturity stages was conducted for the first time. A method for the simultaneous extraction and quantitation of carotenoids and α-tocopherol was developed and validated. Detailed HPLC-DAD-APCI/ESI-MSn analyses enabled the identification of α-tocopherol and 25 carotenoids. The latter comprised antheraxanthin, β-carotene, lutein, luteoxanthin, neoxanthin, phytoene, phytofluene, violaxanthin, zeaxanthin, and several (Z)-isomers of the aforementioned compounds...
March 2018: Food Research International
https://www.readbyqxmd.com/read/29433194/uplc-qtof-ms-profiling-of-two-psidium-species-and-the-in-vivo-hepatoprotective-activity-of-their-nano-formulated-liposomes
#3
Fatema R Saber, Ghada A Abdelbary, Maha M Salama, Dalia O Saleh, Magda M Fathy, Fathy M Soliman
Liver diseases are major health problem in Egypt influencing lifestyle and economy. The demand for nutraceutical hepatoprotective agents is crucial to ameliorate the side effects of synthetic drugs. The present study aims to evaluate antioxidant and hepatoprotective activities of extracts of Psidium guajava L. and Psidium cattleianum Sabine leaves and their nano-formulated liposomes against paracetamol-induced liver damage in rats. Secondary metabolites profile of P. guajava and P. cattleianum leaves was investigated using UPLC-PDA-ESI-qTOF-MSn...
March 2018: Food Research International
https://www.readbyqxmd.com/read/29431803/cretan-tea-origanum-dictamnus-l-as-a-functional-beverage-an-investigation-on-antiglycative-and-carbonyl-trapping-activities
#4
Mariarosa Maietta, Raffaella Colombo, Federica Corana, Adele Papetti
Accumulation of advanced glycation end products (AGEs) in vivo is associated with many chronic disorders such as diabetes, renal failure, aging, and Alzheimer's disease. The aim of this study was to expand the knowledge about the functional properties of Origanum dictamnus L. beverage (Cretan tea) by an investigation about the inhibitory effects on the formation of AGEs and the capacity to trap dicarbonyl compounds. Dittany infusion was characterized for its polyphenolic composition by RP-HPLC-DAD-ESI/MS n and twenty compounds were detected...
February 12, 2018: Food & Function
https://www.readbyqxmd.com/read/29426513/thermo-ph-dual-stimuli-responsive-drug-delivery-for-chemo-photothermal-therapy-monitored-by-cell-imaging
#5
Yang Shu, Rusheng Song, Anqi Zheng, Jingli Huang, Mingli Chen, Jianhua Wang
A thermo/pH dual-stimuli-responsive drug delivery system (DDS) based on polymer coated mesoporous silica nanostructures (MSNs) is developed for facilitating chemotherapy and photothermal therapy. Thermo/pH-responsive polymer, poly((N-isopropylacrylamide, NIPAM)-co-methacrylic acid, MA), is grafted onto MSNs by in situ polymerization, followed by loading a chemotherapeutic drug (doxorubicin hydrochloride, DOX) and a near-infrared-absorbing phototherapeutic agent (indocyanine green, ICG) to construct the intelligent drug delivery system, shortly as DOX-ICG-MSN@p(NIPAM-co-MA)...
May 1, 2018: Talanta
https://www.readbyqxmd.com/read/29425490/fast-spiking-interneurons-supply-feedforward-control-of-bursting-calcium-and-plasticity-for-efficient-learning
#6
Scott F Owen, Joshua D Berke, Anatol C Kreitzer
Fast-spiking interneurons (FSIs) are a prominent class of forebrain GABAergic cells implicated in two seemingly independent network functions: gain control and network plasticity. Little is known, however, about how these roles interact. Here, we use a combination of cell-type-specific ablation, optogenetics, electrophysiology, imaging, and behavior to describe a unified mechanism by which striatal FSIs control burst firing, calcium influx, and synaptic plasticity in neighboring medium spiny projection neurons (MSNs)...
February 8, 2018: Cell
https://www.readbyqxmd.com/read/29420606/multifunctional-nanoparticles-for-real-time-evaluation-of-toxicity-during-fetal-development
#7
Sean Sweeney, Andrea Adamcakova-Dodd, Peter S Thorne, Jose G Assouline
Increasing production of nanomaterials in industrial quantities has led to public health concerns regarding exposure, particularly among pregnant women and developing fetuses. Information regarding the barrier capacity of the placenta for various nanomaterials is limited due to challenges working with ex vivo human placentas or in vivo animal models. To facilitate real-time in vivo imaging of placental transport, we have developed a novel, multifunctional nanoparticle, based on a core of mesoporous silica nanoparticles (MSN), and functionalized for magnetic resonance imaging (MRI), ultrasound, and fluorescent microscopy...
2018: PloS One
https://www.readbyqxmd.com/read/29412927/phytochemical-profile-and-antioxidant-activity-of-caper-berries-capparis-spinosa-l-evaluation-of-the-influence-of-the-fermentation-process
#8
J Jiménez-López, A Ruiz-Medina, P Ortega-Barrales, E J Llorent-Martínez
In this work, we report the phytochemical profile and antioxidant activity of caper berries (Capparis spinosa L.) before and after a fermentation process. The phytochemical profiles were evaluated by high-performance liquid chromatography with UV and electrospray ionization mass spectrometry detection (HPLC-DAD-ESI-MSn). Twenty-one compounds were characterized, and seven of them quantified. The main component of non-fermented berries was glucocapparin, which was degraded upon the fermentation process. Most of the compounds were quercetin and kaempferol glycosides, epicatechin, and proanthocyanidins...
June 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29412912/methionine-sulfone-containing-orbitides-good-indicators-to-evaluate-oxidation-process-of-flaxseed-oil
#9
Xian-Guo Zou, Jiang-Ning Hu, Xue-Mei Zhu, Yu-Fu Wang, Ze-Yuan Deng
This study aimed to explore the possibility of using methionine sulfone (Msn)-containing orbitides as indicators to evaluate the oxidation process of flaxseed oils. Results showed that after 4 days' heating, oxidation values slightly increased (p > .05) with significant decrease in methionine (Met)-containing peptides (p < .05) instead of γ-tocopherol (p > .05). However, as oxidation time continues increasing, oxidation values significantly increased (p < .05) with significant reduction of γ-tocopherol (p < ...
June 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29412022/tailor-made-ph-sensitive-poly-acrylic-acid-functionalized-mesoporous-silica-nanoparticles-for-efficient-and-controlled-delivery-of-anti-cancer-drug-etoposide
#10
Seema Saroj, Sadhana J Rajput
A multifaceted therapeutic platform has been proposed for controlled delivery of Etoposide (ETS) leading to a synergistic advantage of maximum therapeutic efficacy and diminished toxicity. A state of the art pH responsive nanoparticles (NPs) MSNs-PAA consisting of mesoporous silica nanoparticles core and polymeric shell layers, were developed for controlled release of model anti-cancer drug ETS. Graft onto strategy was employed and amination served as an interim step, laying a vital foundation for functionalization of the MSN core with hydrophilic and pH responsive polyacrylic acid (PAA)...
February 7, 2018: Drug Development and Industrial Pharmacy
https://www.readbyqxmd.com/read/29410811/mesoporous-silica-nanoparticle-based-intelligent-drug-delivery-system-for-bienzyme-responsive-tumour-targeting-and-controlled-release
#11
Yang Zhang, Juan Xu
This paper proposes a novel type of multifunctional envelope-type mesoporous silica nanoparticle (MSN) to achieve cancer cell targeting and drug-controlled release. In this system, MSNs were first modified by active targeting moiety hyaluronic acid (HA) for breast cancer cell targeting and hyaluronidases (Hyal)-induced intracellular drug release. Then gelatin, a proteinaceous biopolymer, was grafted onto the MSNs to form a capping layer via glutaraldehyde-mediated cross-linking. To shield against unspecific uptake of cells and prolong circulation time, the nanoparticles were further decorated with poly(ethylene glycol) polymers (PEG) to obtain MSN@HA-gelatin-PEG (MHGP)...
January 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29408139/hyaluronated-mesoporous-silica-nanoparticles-for-active-targeting-influence-of-conjugation-method-and-hyaluronic-acid-molecular-weight-on-the-nanovector-properties
#12
Valentina Ricci, Daniele Zonari, Stefania Cannito, Alessandro Marengo, Maria Teresa Scupoli, Manuela Malatesta, Flavia Carton, Federico Boschi, Gloria Berlier, Silvia Arpicco
We have prepared and evaluated the physico-chemical and biological properties of four different hyaluronated mesoporous silica nanoparticles (MSNs) samples (MSN/HA). Hyaluronic acid (HA) with two different molecular weights (200 and 6.4 kDa) was used for the conjugation of aminopropyl-functionalized MSN (NH2-MSN), following two different procedures. Namely, samples HA200A and HA6.4A were prepared by reacting activated HA with NH2-MSN (method A), while samples HA200B and HA6.4B were obtained carrying out HA activation in the presence of the nanoparticles (method B)...
January 31, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29404021/analysis-of-isoquinoline-alkaloids-from-mahonia-leschenaultia-and-mahonia-napaulensis-roots-using-uhplc-orbitrap-msn-and-uhplc-qqqlit-ms-ms
#13
Awantika Singh, Vikas Bajpai, Sunil Kumar, Ajay Kumar Singh Rawat, Brijesh Kumar
Mahonia leschenaultia (ML) and Mahonia napaulensis (MN) are less known and unexplored medicinal plants of the family Berberidaceae. They are used by the Todas of Nilgiris in their religious and medical practices but chemically less identified. Hence, we decided to do extensive phytochemical analysis to explore the potential of these plant extracts. An ultrahigh performance electrospray tandem mass spectrometry (UHPLC-ESI-MS/MS) method was successfully developed for qualitative analysis of the bioactive components in Mahonia species using Orbitrap Velos Pro mass spectrometer...
April 2017: Journal of Pharmaceutical Analysis
https://www.readbyqxmd.com/read/29402079/monitoring-the-stimulated-uncapping-process-of-gold-capped-mesoporous-silica-nanoparticles
#14
Ashley E Augspurger, Xiaoxing Sun, Brian G Trewyn, Ning Fang, Anthony S Stender
To establish a new method for tracking the interaction of nanoparticles with chemical cleaving agents, we exploited the optical effects caused by attaching 5-10 nm gold nanoparticles with molecular linkers to large mesoporous silica nanoparticles (MSN). At low levels of gold loading onto MSN, the optical spectra resemble colloidal suspensions of gold. As the gold is removed, by cleaving agents, the MSN revert to the optical spectra typical of bare silica. Time-lapse images of gold-capped MSN stationed in microchannels reveal that the rate of gold release is dependent on the concentration of the cleaving agent...
February 5, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29392452/ysa-conjugated-mesoporous-silica-nanoparticles-effectively-target-epha2-overexpressing-breast-cancer-cells
#15
Zhi Liu, Zijian Tao, Qing Zhang, Song Wan, Fenglin Zhang, Yan Zhang, Guanyu Wu, Jiandong Wang
PURPOSE: Neoadjuvant chemotherapy is commonly used to treat patients with locally advanced breast cancer and a common option for primary operable disease. However, systemic toxicity including cardiotoxicity and inefficient delivery are significant challenges form any chemotherapeutics. The development of targeted treatments that lower the risk of toxicity has, therefore, become an active area of research in the field of novel cancer therapeutics. Mesoporous silica nanoparticles (MSNs) have attracted significant attention as efficient drug delivery carriers, due to their high surface area and tailorable mesoporous structures...
February 1, 2018: Cancer Chemotherapy and Pharmacology
https://www.readbyqxmd.com/read/29391182/application-of-electrophoretic-deposition-to-occlude-dentinal-tubules-in-vitro
#16
Lu Zhang, Hualing Sun, Jian Yu, Hongye Yang, Fangfang Song, Cui Huang
OBJECTIVES: This study aims to apply electrophoretic deposition (EPD) for occlusion of dentinal tubules in vitro and investigate its effect on tubule occlusion and shear bond strength (SBS). METHODS: Charged mesoporous silica nanoparticles (MSNs) were synthesized and characterized through field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), and Fourier transform infrared (FT-IR) spectroscopy analyses...
January 30, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29390916/saponin-rich-fraction-from-agave-sisalana-effect-against-malignant-astrocytic-cells-and-its-chemical-characterisation-by-esi-ms-ms
#17
João Victor A de Oliveira, Mariana B Botura, Jener D G Dos Santos, Deivison S Argolo, Victor Diogenes A da Silva, Gisele D da Silva, Hélimar G de Lima, Raimundo Braz Filho, Ivo Jose C Vieira, Alexsandro Branco, Maria José M Batatinha, Silvia L Costa
Astrocytic tumour cells derived from human (GL-15) and rat (C6) gliomas, as well as non-tumoural astrocytic cells, were exposed to the saponin-rich fraction (SF) from Agave sisalana waste and the cytotoxic effects were evaluated. Cytotoxicity assays revealed a reduction of cell viability that was more intensive in glioma than in non-tumoural cells. The SF induced morphological changes in C6 cells. They were characterised by cytoplasmic vacuole formation associated with increase in the formation of acidic lysosomes...
February 2, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29382158/rapid-characterization-and-identification-of-non-diterpenoid-constituents-in-tinospora-sinensis-by-hplc-ltq-orbitrap-msn
#18
Qi-Shu Jiao, Lu-Lu Xu, Jia-Yu Zhang, Zi-Jian Wang, Yan-Yan Jiang, Bin Liu
Tinospora sinensis, a kind of Chinese folk medicine, has functions of harmonizing qi and blood, dredging the channels and collaterals, calming and soothing the nerves. In the present study, a method based on high-performance liquid chromatography coupled with linear ion trap-Orbitrap mass spectrometry (HPLC-LTQ-Orbitrap) was developed for the systematical characterization of the non-diterpenoid constituents which possessed remarkable biological activities in T. sinensis, like anti-tumor, anti-inflammatory, hypoglycemic activity and immunomodulatory activity...
January 29, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29377654/peptide-mediated-targeting-mesoporous-silica-nanoparticles-a-novel-tool-for-fighting-bladder-cancer
#19
Sean K Sweeney, Yi Luo, Michael A O'Donnell, Jose G Assouline
Transitional cell carcinoma of the bladder is particularly devastating due to its high rate of recurrence and difficulty in retention of treatments within the bladder. Current cystoscopic approaches to detect and stage the tumor are limited by the penetrative depth of the cystoscope light source, and intravesical dyes that highlight tumors for surgical resection are non-specific. To address the needs for improved specificity in tumor detection and follow-up, we report on a novel technology relying on the engineered core of mesoporous silica (MSN) with surface modifications that generate contrast in fluorescence and magnetic resonance imaging (MRI)...
February 2017: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29374971/biotinylated-lipid-bilayer-coated-mesoporous-silica-nanoparticles-for-improving-the-bioavailability-and-anti-leukaemia-activity-of-tanshinone-iia
#20
Zhe Li, Yongtai Zhang, Kai Zhang, Zimei Wu, Nianping Feng
The oral bioavailability and anti-leukaemia activity of Tanshinone IIA (TanIIA) were enhanced by using biotinylated-lipid bilayer coated mesoporous silica nanoparticles (Bio-LB-MSNs) as a vehicle. The in vitro release of TanIIA from TanIIA@MSNs was significantly higher than that of the TanIIA powder (p < .05). The in vitro cellular uptake of TanIIA by Caco-2 was increased by loading drug into the Bio-LB-MSNs more than those of the compared nanovehicles without biotin modification. The apparent in situ permeability coefficient (Papp) of TanIIA@Bio-LB-MSNs showed nearly 2...
January 29, 2018: Artificial Cells, Nanomedicine, and Biotechnology
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