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https://www.readbyqxmd.com/read/29232146/switchable-photoacoustic-intensity-of-methylene-blue-via-sodium-dodecyl-sulfate-micellization
#1
Junxin Wang, Ching-Yu Lin, Colman Moore, Anamik Jhunjhunwala, Jesse V Jokerst
The interaction between methylene blue (MB) and sodium dodecyl sulfate (SDS) has been widely studied spectroscopically, but details about their interactions are limited. Here, we combined photoacoustic (PA) imaging with nanoparticle tracking analysis (NTA) and spectroscopy to further elucidate this interaction. PA imaging of 0.05 mM MB showed a 492-fold increase in intensity upon addition of 3.47 mM SDS. Higher concentrations above SDS's critical micelle concentration (CMC) at 8.67 mM decreased the PA intensity by 54-fold...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29232100/engineering-stability-tunable-dna-micelles-using-photocontrollable-dissociation-of-an-intermolecular-g-quadruplex
#2
Cheng Jin, Xiaojing Liu, Huarong Bai, Ruowen Wang, Jie Tan, Xuehui Peng, Weihong Tan
Because of their facile preparation, small size (<100 nm), programmable design and biocompatibility, lipid-based DNA micelles show enormous potential as a tool to monitor biological events and treat human diseases. However, their structural stability in biological matrices suffers from spatiotemporal variability, thus limiting their in vivo use. Herein, we have engineered stability-tunable DNA micelleflares using photocontrollable dissociation of intermolecular G-quadruplexes, which confers DNA micelleflares with robust structural stability against disruption by serum albumin...
December 12, 2017: ACS Nano
https://www.readbyqxmd.com/read/29231945/coordination-driven-micellelization-of-block-copolymers-with-gold-i-complexes-induces-remarkable-phosphorescence-enhancements-with-reversible-mechanochromism
#3
Jun Wang, Qun He, Chen Wang, Weifeng Bu
The coordination-driven self-assembly of block copolymers with gold(i) complexes leads to the formation of spherical micelles with remarkable phosphorescence enhancements. The rising luminescence level increases unexpectedly with increasing the degree of polymerization of the noncoordinated block. Furthermore, one of the gold(i)-containing metallopolymers shows reversible mechanochromic luminescence.
December 12, 2017: Soft Matter
https://www.readbyqxmd.com/read/29231284/the-science-behind-skin-care-cleansers
#4
REVIEW
Zoe Diana Draelos
Two of the most important skin care categories with profound dermatologic implications are cleansers and moisturizers. Cleansers are composed of alkaline soaps or the less barrier-damaging synthetic detergents, known as syndets. The lower skin irritation and dryness found with syndets are related to their reduced tendency to cause protein denaturation due to the charge density of protein-bound micelle-like surfactant aggregates. Many cleansing formulations are available for purchase to meet hygiene needs varying by sex, age, ethnicity, occupation, environment, personal preferences, and the presence or absence of skin disease...
December 12, 2017: Journal of Cosmetic Dermatology
https://www.readbyqxmd.com/read/29231221/responsive-dna-g-quadruplex-micelles
#5
Liliana Cozzoli, Lorina Gjonaj, Marc C A Stuart, Bert Poolman, Gerard Roelfes
A novel and versatile design of DNA-lipid conjugates is presented. The assembly of the DNA headgroups into G-quadruplex structures is essential for the formation of micelles and their stability. By hybridization with a complementary oligonucleotide the micelles were destabilized, resulting in cargo release. In combination with a hairpin DNA aptamer as complementary strand, the release is obtained selectively by the presence of ATP.
December 12, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29228778/effects-of-calcium-ions-on-solubility-and-rheological-behavior-of-a-c22-tailed-hydroxyl-sulfobetaine-surfactant-in-aqueous-solution
#6
Xiuling Ji, Maozhang Tian, Desheng Ma, Youyi Zhu, Zhao-Hui Zhou, Qun Zhang, Yilin Wang
Effects of calcium ions (Ca2+) on the solubility, aggregate structure and rheological behavior of a C22-tailed zwitterionic surfactant, erucyl dimethyl amidopropyl hydroxyl sulfobetaine (EHSB), have been investigated in aqueous solution. In comparison with sodium ions (Na+), Ca2+ ions exhibit much higher efficiency in decreasing the Krafft temperature (TK) of EHSB. Specifically, contrary to Na+ ions which have no obvious effect on the rheological properties of the EHSB solution, Ca2+ ions increase the viscosity of the EHSB solution at lower EHSB concentration, and enhance its elasticity at higher EHSB concentration...
December 11, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29227791/dynamic-content-exchange-between-liprotides
#7
Henriette S Frislev, Stine C L Jakobsen, Signe A Frank, Daniel E Otzen
Liprotides are complexes composed of partially denatured proteins and fatty acids in which the fatty acids form a micelle-like core surrounded by a shell of proteins. Liprotides, composed of α-lactalbumin (aLA) and oleic acid (OA), are similar in components and cytotoxicity to the original HAMLET protein-fatty acid complex. Liprotides composed of aLA and OA kill tumor cells by transferring the OA component to, and thus destabilizing, the cell membrane. Here we investigate liprotides' dynamics of transfer of contents between themselves and membranes using the hydrophobic fluorescent probe pyrene...
December 5, 2017: Biophysical Chemistry
https://www.readbyqxmd.com/read/29227489/synergism-and-aggregation-behaviour-in-an-aqueous-binary-mixture-of-cationic-zwitterionic-surfactants-physico-chemical-characterization-with-molecular-simulation-approach
#8
Bharatkumar Kanoje, Shailesh Padshala, Jigisha Parikh, Suban K Sahoo, Ketan Kuperkar, Pratap Bahadur
Aqueous interactions between a cationic surfactant benzyl dimethylhexadecylammonium chloride (BDHAC) and alkyldimethylammoniopropane sulfonates (CnDAPS) based three zwitterionic surfactants n = 10, 12, and 14 (abbreviated as C10DAPS, C12DAPS and C14DAPS, respectively) were studied using tensiometry, and fluorescence spectrophotometry techniques. The critical micelle concentration degree of synergism and various other parameters such as interaction parameter (β), activity coefficients (fm) and interfacial parameters such as surface pressure (πCMC), packing parameter (P), surface excess concentration (Γmax), surface tension at CMC (γCMC), and minimum area per molecule (Amin) were evaluated using the Regular Solution Theory (RST) of mixed systems...
December 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29227478/a-potentiometric-immunosensor-for-enterovirus-71-based-on-bis-mpa-cooh-dendrimer-doped-agcl-nanospheres-with-a-silver-ion-selective-electrode
#9
Ai-Li Sun
Herein a new potentiometric immunoassay for the point-of-care detection of enterovirus 71 (EV71) was developed by using a silver (Ag+) ion-selective electrode (ISE). Initially, the carboxylated dendrimer-doped AgCl nanospheres were synthesized by the reverse micelle method. Then the synthesized nanospheres were used to label a polyclonal mouse anti-EV71 antibody via a typical carbodiimide coupling method. The immunoreaction was executed on a monoclonal anti-EV71 antibody-coated microplate by using biofunctional AgCl nanospheres as the detection antibody...
December 11, 2017: Analyst
https://www.readbyqxmd.com/read/29225263/a-phase-i-ii-study-for-dose-finding-and-to-investigate-the-safety-pharmacokinetics-and-preliminary-efficacy-of-nk012-an-sn-38-incorporating-macromolecular-polymeric-micelle-in-patients-with-multiple-myeloma
#10
Masaki Ri, Kenshi Suzuki, Shinsuke Iida, Kiyohiko Hatake, Takaaki Chou, Masafumi Taniwaki, Noriko Watanabe, Tetsuji Tsukamoto
Objective Multiple myeloma (MM) is the second most common hematological cancer. An attempt to treat MM using a topoisomerase I inhibitor was made based on our previous non-clinical studies suggesting the usefulness of an SN-38 derivative. Our aim was to conduct a phase I/II study of NK012, a micelle-forming SN-38 conjugate, in patients with relapsed/refractory multiple myeloma (RRMM). Methods NK012 was administered at doses of 12-24 mg/m2 and the safety, pharmacokinetics and preliminary efficacy were evaluated...
December 8, 2017: Internal Medicine
https://www.readbyqxmd.com/read/29224625/peroxidase-chemically-attached-on-polymeric-micelle-and-its-reaction-with-phenolic-compounds
#11
Moo-Yeal Lee, Parnian Bigdelou, Kyung-Jin Hong, Kyoung-Ae Kim, Yoshitsune Shinya, Toshio Kajiuchi
Horseradish peroxidase was chemically modified with comb-shaped polymaleic anhydride-alt-1-tetradecene (PMA-TD) in microemulsion systems to produce surface-active peroxidase that has capability to form micellar structures in aqueous solutions and can be concentrated at liquid/liquid interfaces without unfolding of the enzyme. For chemical modification oil-in-water (O/W) and water-in-oil (W/O) microemulsion systems composed of n-butyl acetate and a buffer solution were prepared because n-butyl acetate turned out to be less detrimental to the activity of peroxidase at high degree of modification compared to other organic solvents...
February 2018: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/29223736/transepithelial-transfer-of-phenanthrene-but-not-of-benzo-a-pyrene-is-inhibited-by-fatty-acids-in-the-proximal-intestine-of-rainbow-trout-oncorhynchus-mykiss
#12
Stefan de Gelder, Henrik Sundh, Thamar N M Pelgrim, Josef D Rasinger, Lotte van Daal, Gert Flik, Marc H G Berntssen, Peter H M Klaren
The inclusion of vegetable oils in aquafeeds introduces contaminating polycyclic aromatic hydrocarbons (PAHs) in salmonids. Since lipophilic PAHs solubilize in micelles composed of lipids, bile salts and fatty acids, dietary lipid composition can alter intestinal transepithelial PAH transfer. We studied the uptake of two PAHs, viz. benzo[a]pyrene (BaP) and phenanthrene (PHE), in rainbow trout (Oncorhynchus mykiss) intestine. We also investigated the effects of two fatty acids, viz. fish oil-derived eicosapentaenoic acid (EPA, 20:5n-3) and vegetable oil-derived oleic acid (18:1n-9) on intestinal uptake...
December 6, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29223647/tat-conjugated-chitosan-cationic-micelle-for-nuclear-targeted-drug-and-gene-co-delivery
#13
Guan-Hai Wang, Yin-Yu Cai, Ji-Kun Du, Li Li, Qin Li, Hui-Kang Yang, Jian-Tao Lin
We developed a high-efficiency nucleus-targeted co-delivery vector that delivers genes and drugs directly into the nucleus of cancer cells. The system is based on grafted poly-(N-3-carbobenzyloxy-lysine) (CPCL) with transactivator of transcription (TAT)- chitosan on the surface. It is designed to perform highly efficient nucleus- targeted gene and drug co-delivery. Confocal laser scanning microscopy (CLSM) revealed that more TAT-CPCL entered the nucleus than does CPCL alone. The TAT-modified vector serves as a gene and drug co-delivery mechanism to achieve high gene transfection efficiency, high apoptosis and low viability in HeLa cells...
December 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29223324/novel-method-for-the-characterization-of-charged-polymer-self-assemblies-multidetector-thermal-field-flow-fractionation-in-aqueous-mobile-phase
#14
Guilaume Greyling, Harald Pasch
Charged block copolymer self-assemblies, such as charged micelles, have attracted much attention as versatile drug delivery systems due to their readily tunable characteristics such as size and surface charge. However, current column-based analytical techniques are not suitable to fractionate and comprehensively characterize charged micelles in terms of size, molar mass, chemical composition and morphology. Multidetector thermal field-flow fractionation (ThFFF) is shown to be a unique characterization platform that can be used to characterize charged micelles in terms of size, molar mass, chemical composition and morphology in aqueous mobile phases with various ionic strengths and pH...
December 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29223048/extraction-protocol-and-liquid-chromatography-tandem-mass-spectrometry-method-for-determining-micelle-entrapped-paclitaxel-at-the-cellular-and-subcellular-levels-application-to-a-cellular-uptake-and-distribution-study
#15
Nan Zheng, Bin Lian, Wenwen Du, Guobing Xu, Jiafu Ji
Paclitaxel-loaded polymeric micelles (PTX-PM) are commonly used as tumor-targeted nanocarriers and display outstanding antitumor features in clinic, but its accumulation and distribution in vitro are lack of investigation. It is probably due to the complex micellar system and its low concentration at the cellular or subcellular levels. In this study, we developed an improved extraction method, which was a combination of mechanical disruption and liquid-liquid extraction (LLE), to extract the total PTX from micelles in the cell lysate and subcellular compartments...
December 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29220188/instability-mechanisms-of-water-in-oil-nanoemulsions-with-phospholipids-temporal-and-morphological-structures
#16
Jan-Hendrik Sommerling, Maria Betania Carreira de Matos, Ellen Hildebrandt, Alberto Dessy, Robbert J Kok, Hermann Nirschl, Gero Leneweit
Many food preparations, pharmaceuticals, and cosmetics use water in oil (W/O) emulsions stabilized by phospholipids. Moreover, recent technological developments try to produce liposomes or lipid coated capsules from W/O emulsions, but are faced with colloidal instabilities. To explore these instability mechanisms, emulsification by sonication was applied in three cycles and the sample stability was studied for 3 hours after each cycle. Clearly identifiable temporal structures of instability provide evidence about the emulsion morphology: an initial regime of about 10 minutes is shown to be governed by coalescence after which Ostwald ripening dominates...
December 8, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29220051/improving-extraction-and-post-purification-concentration-of-membrane-proteins
#17
Hasin Feroz, HyeYoung Kwon, Jing Peng, Hyeonji Oh, Bryan Ferlez, Carol S Baker, John H Golbeck, Guillermo C Bazan, Andrew L Zydney, Manish Kumar
Membrane proteins (MPs), despite being critically important drug targets for the pharmaceutical industry, are difficult to study due to challenges in obtaining high yields of functional protein. Most current extraction efforts use specialized non-ionic detergents to solubilize and stabilize MPs, with MPs being concentrated by ultrafiltration (UF). However, many detergents are retained during the UF step, which can destabilize MPs and/or interfere with their characterization. Here, we studied the influence of detergent selection on the extraction and UF-based concentration of biomedically-relevant MPs, the light-driven sodium and chloride transporters, KR2 and halorhodopsin (pHR) which are also model proteins for more complex mammalian rhodopsins...
December 8, 2017: Analyst
https://www.readbyqxmd.com/read/29218582/application-of-fluorescence-emission-for-characterization-of-albendazole-and-ricobendazole-micellar-systems-elucidation-of-the-molecular-mechanism-of-drug-solubilization-process
#18
Josefina Priotti, Darío Leonardi, Guillermo Pico, María C Lamas
Albendazole (ABZ) and ricobendazole (RBZ) are referred to as class II compounds in the Biopharmaceutical Classification System. These drugs exhibit poor solubility, which profoundly affects their oral bioavailability. Micellar systems are excellent pharmaceutical tools to enhance solubilization and absorption of poorly soluble compounds. Polysorbate 80 (P80), poloxamer 407 (P407), sodium cholate (Na-C), and sodium deoxycholate (Na-DC) have been selected as surfactants to study the solubilization process of these drugs...
December 7, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29215892/molecular-dynamics-simulation-of-the-ph-induced-structural-transitions-in-ctab-nasal-solution
#19
Hui Yan, Zhe Han, Kaiming Li, Guangyong Li, Xilian Wei
We performed molecular dynamics simulations to study the pH-induced structural transitions for aqueous mixtures of a cationic surfactant (cetyltrimethylammonium bromide, CTAB) and a hydrotrope (sodium salicylate, NaSal). We obtained rigid cylindrical, spherical, and flexible cylindrical micelles at pH 7, 2, and 0, respectively, which agrees well with the experimental results of Umeasiegbu et al. (Langmuir 2016, 32, 655). With analyzing the different micellar structural properties, including distribution and molecular orientation of CTA+ and Sal- inside the micelle, we found the binding form of the protonated salicylate molecules with CTA+ is different from that of Sal- ions...
December 7, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29215294/structure-reconstruction-of-lyp-1-lc-lyp-1-coupling-by-amide-bond-inspires-the-brain-metastatic-tumor-targeted-drug-delivery
#20
Xiaoyu Zhang, Fei Wang, Qing Shen, Cao Xie, Yu Liu, Jun Pan, Weiyue Lu
The stability and binding affinity of targeting ligands play important roles in active targeting drug delivery. Herein LyP-1 peptide was used as a model peptide to investigate chemical-biology-based strategies in the design of peptide ligands for active targeting. LyP-1, a short peptide cyclized with a disulfide bond, can specifically bind to tumor cells and tumor lymphatics through the interaction with cell-surface protein p32/gC1qR. Lc(LyP-1), with the same sequence of LyP-1 by amide coupling, showed better cellular uptake and stability in blood in our previous research...
December 7, 2017: Molecular Pharmaceutics
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