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Anna L Hagstrom, Hak-Lae Lee, Myung-Soo Lee, Hyun-Seok Choe, Joori Jung, Byung-Geon Park, Won-Sik Han, Jong Soo Ko, Jae-Hong Kim, Jaehyuk Kim
Triplet-triplet annihilation upconversion (TTA-UC) has recently drawn widespread interest for its capacity to harvest low-energy photons and to broaden the absorption spectra of photonic devices such as solar cells. Although conceptually promising, effective integration of TTA-UC materials into practical devices has been difficult due to the diffusive and anoxic conditions required in TTA-UC host media. Of the solid-state host materials investigated, rubbery polymers facilitate the highest TTA-UC efficiencies...
February 14, 2018: ACS Applied Materials & Interfaces
Olufinsho Awodele, Samson Fatoki
BACKGROUND: Nigeria has been plagued by counterfeit and poor quality medicines with several studies indicating varying degree of prevalence. Thus, this study is aimed at determining the anticounterfeiting strategies employed by local drug manufacturers in Lagos-Nigeria. METHOD: The first phase was a descriptive study which involves the use of a self-administered closed ended structured questionnaire to assess the anticounterfeiting strategies employed by local manufacturers in Nigeria...
December 4, 2017: Journal of Population Therapeutics and Clinical Pharmacology
M A Zamalloa Jara, C Luízar Obregón, C Araujo Del Castillo
The aim of this study was to verify if a portable X-ray fluorescence (pXRF) spectrometer can recognize the security features in banknotes that are reproducible by counterfeiters. Peruvian Nuevo Sol banknotes were studied: 4 genuine and 3 fake ones, in 11 points of analysis for each one, at all 77 data set. The correlation analysis of spectra among original notes was 1.0, and there was no correlation with fake banknotes. pXRF prove that two security features were reproducible for counterfeiters.
February 2, 2018: Applied Radiation and Isotopes
Minxuan Wang, Yongjie Zhang
Tea is one of the most popular drinks in the world, but counterfeit or adulterated tea can be found now and then on the tea market. The traditional methods dependent on sensory, physical and chemical tests cannot identify the composition of adulterated plant species accurately. We developed therefore a method for identification of adulterated plants in tea based on qualitative detection of plant rbcL (Ribulose 1,5-bisphosphate carboxylase-oxygenase large subunit) fragments, which involved amplification, sequencing and sequence analyses of rbcL fragments...
February 25, 2018: Sheng Wu Gong Cheng Xue Bao, Chinese Journal of Biotechnology
František Králík, Patrik Jirmásek, Martin Kuchař, Vladimír Setnička
No abstract text is available yet for this article.
February 8, 2018: Chirality
Miguel R Carro-Temboury, Riikka Arppe, Tom Vosch, Thomas Just Sørensen
Secure data encryption relies heavily on one-way functions, and copy protection relies on features that are difficult to reproduce. We present an optical authentication system based on lanthanide luminescence from physical one-way functions or physical unclonable functions (PUFs). They cannot be reproduced and thus enable unbreakable encryption. Further, PUFs will prevent counterfeiting if tags with unique PUFs are grafted onto products. We have developed an authentication system that comprises a hardware reader, image analysis, and authentication software and physical keys that we demonstrate as an anticounterfeiting system...
January 2018: Science Advances
Hongki Kang, Jee Woong Lee, Yoonkey Nam
Inkjet printing of thermo-plasmonic nanoparticles enables instantaneous, large-area heat pattern generation upon light illumination from distance. By printing multiple metal nanoparticles of different shapes overlaid, we can fabricate multi-wavelength thermo-plasmonic images, which generate different heat patterns from a single printed image depending on the wavelength choice of light. In this work, we propose a novel multi-wavelength thermo-plasmonic image printing that can be used for anti-counterfeit technology...
January 30, 2018: ACS Applied Materials & Interfaces
Julia Hornberger
The counterfeiting of medication is increasingly seen as a major threat to health, especially in the light of both the everyday reliance on and a broadening of world-wide access to pharmaceuticals. Exaggerated or real, this threat has inaugurated, this article argues, a shift from a drug safety regime to a drug security regime that governs the flow of pharmaceuticals and brings together markets, police and health actors in new ways. This entails a shift from soft disciplinary means aimed at incremental and continued inclusion of defaulters, to one of drastically sovereign measures of exclusion and banishment aimed at fake goods and the people associated with them, in the name of health...
January 29, 2018: Medical Anthropology Quarterly
Xiaokai Chen, Xiaodong Zhang, Liu-Yuan Xia, Hong-Yin Wang, Zhan Chen, Fu-Gen Wu
Water-dispersible nanomaterials with superbright photoluminescence (PL) emissions and narrow PL bandwidths are urgently desired for various imaging applications. Herein, for the first time, we prepared ultrasmall organosilica nanodots (OSiNDs) with an average size of ~2.0 nm and ~100% green-emitting PL quantum efficiency via a one-step hydrothermal treatment of two commercial reagents (a silane molecule and rose bengal). In particular, the structural reorganization and halide loss of rose bengal during the hydrothermal treatment contribute to the ultrahigh quantum yield and low phototoxicity of OSiNDs...
January 25, 2018: Nano Letters
Jing Zuo, Dapeng Sun, Langping Tu, Yanni Wu, Yinghui Cao, Bin Xue, Youlin Zhang, Yulei Chang, Xiaomin Liu, Xianggui Kong, Wybren Jan Buma, Evert Jan Meijer, Hong Zhang
Upconversion emission dynamics has long been believed to be determined by the activator and its interaction with neighboring sensitizers. This vision is, however, confirmed not valid for nanostructures by this work, where we demonstrate that excitation energy migration affects greatly upconversion emission dynamics. "Dopant ions spatially separated'' nanostructures are designed as model systems and the intimate link between the random nature of energy migration and upconversion emission time behavior is unraveled by theoretical modelling and confirmed spectroscopically...
January 24, 2018: Angewandte Chemie
Yao-Dong He, Ze-Lian Zhang, Juan Xue, Xiao-Hui Wang, Fei Song, Xiu-Li Wang, Li-Li Zhu, Yu-Zhong Wang
As a wise and profound teacher, nature provides numerous creatures with rich colors to us. To biomimic structural colors in nature as well as color changes responsive to environmental stimuli, there is a long way to go for the development of free-standing photonic films from natural polymers. Herein, a highly flexible, controllably iridescent, and multi-stimuli-responsive cellulose nanocrystal (CNC) film is prepared by simply introducing a small molecule as both plasticizer and hygroscopic agent. The presence of the additive does not block the self assembly of CNC in aqueous solution but results in the enhancement of its mechanical toughness, making it possible to obtain free-standing iridescent CNC films with tunable structural colors...
January 23, 2018: ACS Applied Materials & Interfaces
Chiaki Crews, Peter S Kenny, Daniel O'Flynn, Robert D Speller
A system using energy-dispersive X-ray diffraction (EDXRD) has been developed and tested using multivariate calibration for the quantitative analysis of tablet-form mixtures of common pharmaceutical ingredients. A principal advantage of EDXRD over the more traditional and common angular dispersive X-ray diffraction technique (ADXRD) is the potential of EDXRD to analyse tablets within their packaging, due to the higher energy X-rays used. In the experiment, a series of caffeine, paracetamol and microcrystalline cellulose mixtures were prepared and pressed into tablets...
January 9, 2018: Journal of Pharmaceutical and Biomedical Analysis
Garima Verma, Gousia Chashoo, Asif Ali, Mohemmed Faraz Khan, Wasim Akhtar, Israr Ali, Mymoona Akhtar, Mohammad Mumtaz Alam, Mohammad Shaquiquzzaman
Depravity of malaria in terms of morbidity and mortality in human beings makes it a major health issue in tropical and subtropical areas of the globe. Drug counterfeiting and non-adherence to the treatment regimen have significantly contributed to development and spread of multidrug resistance that has highlighted the need for development of novel and more efficient antimalarial drugs. Complexity associated with cancer disease and prevalence of diversified cell populations vindicates highly specific treatment options for treatment of cancer...
January 11, 2018: Bioorganic Chemistry
Jiseok Lee, Sungbaek Seo, Jinsang Kim
We developed new photo-responsive polydiacetylene (PR-PDA) molecules by incorporating a photo-cleavable moiety, 6-nitropiperonyl alcohol (NP) or 4, 5-dimethoxy-2-nitrobenzyl alcohol (DMN), into a self-assembling diacetylene molecule. Inducing steric disordering of the assembled PDA molecules by the cleavage of the photo-responsive moiety under 365 nm UV irradiation results in color transition from blue to red and development of red fluorescence, allowing convenient photo patterning. Further writing and erasing of fluorescence patterns are demonstrated toward novel secure information communication and anti-counterfeiting applications...
January 12, 2018: ACS Applied Materials & Interfaces
Bin Song, Houyu Wang, Yiling Zhong, Binbin Chu, Yuanyuan Su, Yao He
Herein, we present the first example of a silicon nanoshuttle-based security ink simultaneously featuring attractive optical and magnetic properties, suitable for fluorescent and magnetic anti-counterfeiting and encryption. Significantly, the information can be dual-encrypted through multi-color fluorescence and longitudinal (T1)/transverse (T2) relaxation contrast by using the silicon nanoshuttle-based security ink. We further demonstrate the feasibility of this high-performance ink for practical application in banknote anti-counterfeiting...
January 12, 2018: Nanoscale
Monali Moirangthem, Albertus P H J Schenning
A blue reflective photonic polymer coating which can be patterned in full color, from blue to red, by printing with an aqueous calcium nitrate solution has been fabricated. Color change in the cholesteric liquid crystalline polymer network over the entire visible spectrum is obtained by the use of non-reactive mesogen. The pattern in the coating is hidden in the blue color dry state and appears on exposure to water or by exhaling breath onto it due to different degrees of swelling of the polymer network. The degree of swelling depends on the printed amount of calcium which acts as a crosslinker...
January 9, 2018: ACS Applied Materials & Interfaces
Andrew V Ewing, Sergei G Kazarian
Vibrational spectroscopic imaging and mapping approaches have continued in their development and applications for the analysis of pharmaceutical formulations. Obtaining spatially resolved chemical information about the distribution of different components within pharmaceutical formulations is integral for improving the understanding and quality of final drug products. This review aims to summarise some key advances of these technologies over recent years, primarily since 2010. An overview of FTIR, NIR, terahertz spectroscopic imaging and Raman mapping will be presented to give a perspective of the current state-of-the-art of these techniques for studying pharmaceutical samples...
December 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Thomas Kuballa, Thomas Hausler, Alex O Okaru, Maria Neufeld, Kennedy O Abuga, Isaac O Kibwage, Jürgen Rehm, Burkhard Luy, Stephan G Walch, Dirk W Lachenmeier
Beverage fraud involving counterfeiting of brand spirits is an increasing problem not only due to deception of the consumer but also because it poses health risks e.g. from possible methanol admixture. Suspicious spirit samples from Russia and Kenya were analysed using 1H nuclear magnetic resonance (NMR) spectroscopy in comparison to authentic products. Using linear regression analysis of spectral integral values, 4 counterfeited samples from Russia and 2 from Kenya were easily identifiable with R2 < 0...
April 15, 2018: Food Chemistry
Rong Liu, Zhibin Yin, Xiaoling Cheng, Yifan Meng, Wei Hang, Benli Huang
Laser desorption laser postionization time-of-flight mass spectrometry (L2MS) was applied for unambiguous discrimination of pigment-based inks in blue, black, and red gel pens and molecular imaging of equivocal documents in a quasi-non-destructive way. In comparison to laser desorption mass spectrometry (LD-MS), additional discriminatory information on ink components is acquired uniquely, facilitating the distinct differentiation of various pigmented gel inks. More importantly, diversified images of additional characteristic ions achieved using L2MS offer reliable support to discriminate forged documents and decipher important hidden contents...
December 28, 2017: Analytical and Bioanalytical Chemistry
Yixi Zhuang, Ying Lv, Le Wang, Wenwei Chen, Tianliang Zhou, Takashi Takeda, Naoto Hirosaki, Rong-Jun Xie
Deep-trap persistent luminescence materials exhibit unique properties of energy storage and controllable photon release under additional stimulation, allowing for both wavelength and intensity multiplexing to realize high-capacity storage in the next-generation information storage system. However, the lack of suitable persistent luminescence materials with deep traps is the bottleneck of such storage technologies. In this paper, we successfully developed a series of novel deep-trap persistent luminescence materials in the Ln2+/Ln3+-doped SrSi2O2N2 system (Ln2+ = Yb, Eu; Ln3+ = Dy, Ho, Er) by applying the strategy of trap depth engineering...
December 26, 2017: ACS Applied Materials & Interfaces
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