Simultaneous imaging of latent fingerprint and quantification of nicotine residue by NaYF4:Yb/Tm upconversion nanoparticles

Lanthanide-Doped Upconversion Nanoparticles: Exploring A Treasure Trove of NIR-Mediated Emerging Applications

Lanthanide-doped upconversion nanoparticles (UCNPs) possess the remarkable ability to convert multiple near-infrared (NIR) photons into higher energy ultraviolet-visible (UV-vis) photons, making them a prime candidate for several advanced applications within the realm of nanotechnology. Compared to traditional organic fluorophores and quantum dots (QDs), UCNPs possess narrower emission bands (fwhm of 10-50 nm), large anti-Stokes shifts, low toxicity, high chemical stability, and resistance to photobleaching and blinking. In addition, unlike UV-vis excitation, NIR excitation is nondestructive at lower power intensities and has high tissue penetration depths (up to 2 mm) with low autofluorescence and scattering. Together, these properties make UCNPs exceedingly favored for advanced bioanalytical and theranostic applications, where these systems have been well-explored. UCNPs are also well-suited for bioimaging, optically modulating chemistries, forensic science, and other state-of-the-art research applications. In this review, an up-to-date account of emerging applications in UCNP research, beyond bioanalytical and theranostics, are presented including optogenetics, super-resolution imaging, encoded barcodes, fingerprinting, NIR vision, UCNP-assisted photochemical manipulations, optical tweezers, 3D printing, lasing, NIR-II imaging, UCNP-molecule nanohybrids, and UCNP-based persistent luminescent nanocrystals.

Simultaneous determination of 36 hypotensive drugs in fingerprints by ultra performance liquid chromatography-triple quadrupole composite linear ion trap mass spectrometry

指印中蕴含着供体摄入成分等相关信息,通过对其分析可对供体进行特征刻画,从而为案件侦查提供线索,指印分析也可用于药物摄入的定性检测,因此检验指印中的降压药具有重要的实际应用价值。建立了超高效液相色谱-三重四极杆复合线性离子阱质谱(UPLC-Q-TRAP/MS)同时检测指印中36种降压药的方法。前处理方法采用沉淀蛋白法,使用3×3 cm滤纸采集指印,将滤纸剪碎置于2 mL塑料离心管中,加入0.50 mL甲醇,涡旋混合1 min,超声振荡3 min,取出后以12000 r/min离心5 min,取上清液进样分析。采用ACQUITY UPLC^® BEH C18柱(100 mm×3.0 mm, 1.7 μm)分离,以0.01%甲酸水溶液和甲醇作为流动相进行梯度洗脱。质谱分析采用可编程多反应监测-信息关联采集-增强子离子(SMRM-IDA-EPI)扫描方式,在高灵敏度分析的同时进行二级谱库检索,增加定性结果的准确性。36种药物在0.05~50.00 ng/fingerprint范围内线性关系良好,相关系数(r)大于0.99,检出限和定量限分别为0.001~0.045 ng/fingerprint和0.002~0.050 ng/fingerprint,在0.25、2.50、25.00 ng/fingerprint 3个加标水平下的基质效应为79.0%~119.2%,回收率为79.3%~116.2%,日内精密度为0.2%~18.3%,日间精密度为1.6%~19.1%。使用该方法检测了87名高血压患者指印中的降压药,大部分样本中可检出其所服用的药物。该方法操作简单,灵敏度高,选择性好,适用于指印中降压药的筛查检验。

Sandwich-type photoelectrochemical immunosensor for procalcitonin detection based on Mn2+ doped CdS sensitized Bi2WO6 and signal amplification of NaYF4:Yb, Tm upconversion nanomaterial

In this paper, we constructed a sandwich-type photoelectrochemical (PEC) immunosensor for the quantitative detection of procalcitonin (PCT) based on the sensitization of Mn²⁺ doped CdS (CdS:Mn) nanocomposites to Bi₂WO₆ and the signal amplification effect of an upconversion material NaYF₄:Yb,Tm. Bi₂WO₆ was synthesized with a three-dimensional flowered structure. CdS:Mn reduced the recombination of photogenerated carriers, and significantly improved photocurrent response. Lanthanide-doped upconversion nanomaterials were used as the label of secondary antibody. NaYF₄:Yb,Tm have two functions, not only connected with the secondary antibody, but also can further amplify the photocurrent response. The proposed immunosensor for detecting PCT provided a desired linear range of 0.5 pg mL^-1-100 ng mL^-1 and a detection limit of 0.13 pg mL^-1 under optimal experimental conditions. Besides, the PEC immunosensor demonstrated good reproducibility, specificity and stability. The results of determination of PCT in real human serum samples were satisfactory. Thus, the immunosensor may be applied in the clinical diagnosis of PCT and other biomarkers.