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Liu, S.*; Yang, D. S.*; Wang, S.*; Luan, H.*; Sekine, Yurina; Model, J. B.*; Aranyosi, A. J.*; Ghaffari, R.*; Rogers, J. A.*
EcoMat (Internet), 5(1), p.e12270_1 - e12270_18, 2023/01
Times Cited Count：17 Percentile：91.64(Chemistry, Physical)Advanced capabilities in noninvasive, in situ monitoring of sweat serve as the basis for obtaining real-time insights into human physiological state, health, and performance. Although recently reported microfluidic systems support powerful functions, most are designed as single-use disposables. Here, we introduce materials and molding techniques that bypass these concerns through biodegradable microfluidic systems with a full range of features. The key components fully degrade through the enzymatic action of microorganisms in natural soil environments. Detailed characterization of the device reveal a set of essential performance parameters that are comparable to, or even better than, those of non-degradable counterparts. Human subject studies illustrate the ability of these devices to acquire accurate measurements of sweat loss, sweat rate, pH, and chloride concentration.
Zhang, Y.*; Guo, H.*; Kim, S. B.*; Wu, Y.*; Ostojich, D.*; Park, S. H.*; Wang, X.*; Weng, Z.*; Li, R.*; Bandodkar, A. J.*; et al.
Lab on a Chip, 19(9), p.1545 - 1555, 2019/05
Times Cited Count：139 Percentile：99.63(Biochemical Research Methods)This paper introduces two important advances in recently reported classes of soft, skin-interfaced microfluidic systems for sweat capture and analysis: (1) a simple, broadly applicable means for collection of sweat that bypasses requirements for physical/mental exertion or pharmacological stimulation and (2) a set of enzymatic chemistries and colorimetric readout approaches for determining the concentrations of creatinine and urea in sweat, across physiologically relevant ranges. The results allow for routine, non-pharmacological capture of sweat across patient populations, such as infants and the elderly, that cannot be expected to sweat through exercise, and they create potential opportunities in the use of sweat for kidney disease screening/monitoring.
Kim, S. B.*; Lee, K.-H.*; Raj, M. S.*; Reeder, J. T.*; Koo, J.*; Hourlier-Fargette, A.*; Bandodkar, A. J.*; Won, S. M.*; Sekine, Yurina; Choi, J.*; et al.
Small, 14(45), p.1802876_1 - 1802876_9, 2018/11
Times Cited Count：78 Percentile：94.01(Chemistry, Multidisciplinary)Excretion of sweat from eccrine glands is a dynamic physiological process that varies with body position, activity level, and health status. Information content embodied in sweat rate and chemistry can be used to assess health status and athletic performance. This paper presents a thin, miniaturized, skin-interfaced microfluidic technology that includes a reusable, battery-free electronics module for measuring sweat conductivity and rate in real-time using wireless power from and data communication with capabilities in near field communications (NFC). Systematic studies of these combined microfluidic/electronic systems, accurate correlations of measurements performed with them to those of laboratory standard instrumentation, and field tests on human subjects establish the key operational features and their utility in sweat analytics.
quantitative analysis of sweat chemistrySekine, Yurina; Kim, S. B.*; Zhang, Y.*; Bandodkar, A. J.*; Xu, S.*; Choi, J.*; Irie, Masahiro*; Ray, T. R.*; Kohli, P.*; Kozai, Naofumi; et al.
Lab on a Chip, 18(15), p.2178 - 2186, 2018/08
The rich composition of solutes and metabolites in sweat and its relative ease of collection upon excretion from skin pores make this class of biofluid an attractive candidate for point of care analysis. Here, we present a complementary approach that exploits fluorometric sensing modalities integrated into a soft, skin-interfaced microfluidic system which, when paired with a simple smartphone-based imaging module, allows for in-situ measurement of important biomarkers in sweat. A network array of microchannels and a collection of microreservoirs pre-filled with fluorescent probes that selectively react with target analytes in sweat (e.g. probes), enable quantitative, rapid analysis. Field studies on human subjects demonstrate the ability to measure the concentrations of chloride, sodium and zinc in sweat, with accuracy that matches that of conventional laboratory techniques.
Yamamoto, Masahiko; Kuno, Takehiko; Takamura, Yuzuru*
no journal, ,
Target elements are separated and measured in a glove box (GB) to prevent internal exposure when radioactive material is analyzed. Although liquid-liquid solvent extraction is used for the separation, liquid waste reduction is required due to the organic solvents. Also, an large apparatus such as ICP-OES requires high cost due to the designing sepcific GB for installation. Therefore, small apparatus is desired. In this study, we have been focused on microchemical chip (MCC) and liquid electrode plasma (LEP). Reduction of liquid radioactive waste is expected becuase solvent extraction can be performed in microchannel by using MCC. The emission spectroscopy using LEP (LEP-OES) requires neither plasma gas nor cooling water, and the device is small enough to installed in normal GB. We will report the results of the Pu measurement system combining MCC with liquid scintillation counter, and elemental analysis of liquid radioactive waste by LEP-OES.
長縄 弘親; 永野 哲志
not registered
JP, 2020-123843 
Patent licensing information
【課題】固体の混入・析出や気体の発生に影響されない液液混相流路群を形成させる方法、及び液液混相流路群の形成と消滅をシンプルな仕組みにより制御する方法並びにそれらの方法を実施するためのモジュールを提供する。 【解決手段】2つの混じり合わない液体が界面を成して存在する2液相系において、微小液滴が密に積層して生じる液液混相の中で3次元的網目構造を成すひとつながりの流路群を高密度で形成させる方法、及び前記界面に向けての液滴噴出により該流路群を形成させ、単純な容器形状の変化だけで該流路群を完全に消滅させるところの、液液混相流路群の形成・消滅を制御する方法、並びにそれらの方法を実施するためのモジュール。
