Origins of the method of standard additions and of the use of an internal standard in quantitative instrumental chemical analyses

Burns, D. Thorburn; Walker, Michael J.

doi:10.1007/s00216-019-01754-w

Cited by 21 publications

(8 citation statements)

References 35 publications

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“…A single peak was first filtered to remove noise. Deviation values were filtered based on the interquartile range, followed by normalization of the data using the internal standard (IS) [38]. The internal standard used in this experiment was 5 μL 2-chloro-L-phenylalanine (1 mg/mL).…”

Section: Discussionmentioning

confidence: 99%

Metabolomics of Pseudomonas aeruginosa Treated by Atmospheric-Pressure Cold Plasma

Zhang

et al. 2021

Applied Sciences

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With increasing drug resistance of Pseudomonas aeruginosa, a new sterilization method is needed. Plasma has been shown to be an effective method of sterilization, but no researchers have studied the effect of plasma on bacterial metabolism. In this paper, we studied the emission spectrum, liquid phase active particles, and other physical and chemical properties of a portable plasma device. Pseudomonas aeruginosa were then treated with activated water generated by surface plasma discharge. Using gas chromatography time-of-flight mass spectrometry (GC-TOF-MS) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis, we obtained the differential metabolite pathways. The results showed that, after plasma activated water treatment, the carbohydrate metabolism of the bacteria was inhibited and the metabolic processes of protein and amino acid decomposition were enhanced. Therefore, water activated by atmospheric-pressure cold plasma can significantly change bacterial metabolites, thus promoting bacterial death.

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Section: Discussionmentioning

confidence: 99%

Metabolomics of Pseudomonas aeruginosa Treated by Atmospheric-Pressure Cold Plasma

Zhang

et al. 2021

Applied Sciences

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“…For the SAM experiments, in the early stage before 2000, the standard addition with points of only four different concentrations (i.e., three calibrators) were widely employed as the final probe [1,5,43]. In our opinion, though it is understandable to use such calibration curves with a few calibration points due to the laboriousness of SAM, the accurateness of such a method is of concern.…”

Section: How To Get Concentration(s) Of Preexisting Xenobiotic(s) In a Matrix By The Standard Addition Methodsmentioning

confidence: 99%

“…According to Burns and Walker [1] and Kelly et al [2], the first use of the SAM in instrumental chemical analysis was in polarography by Hohn in as early as 1937. Outside the area of polarography, the SAM was first used in atomic emission spectrometry in 1950, in ultraviolet-visible spectroscopy in 1960, and in 1 H nuclear magnetic resonance spectroscopy in 2012 [1]. The theory of SAM in instrumental analyses was published by Bader [3] in 1980.…”

Section: Introductionmentioning

confidence: 99%

The standard addition method and its validation in forensic toxicology

et al. 2021

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Purpose In the quantitative forensic toxicological analyses using instruments, major methods to be employed are conventional matrix-matched calibration method (MMCM). However, nowadays, the needs for using the standard addition methods (SAM) are increasing. In spite of this situation, there are no reports of the guidelines for the validations of SAM. In this review, the principle, how to perform it, advantages, disadvantages, reported application data, and the details of validation procedures for the SAM are described. Methods Various databases such as SciFinder, Google and Google Scholar were utilized to collect relevant reports referring to the SAM. The long experiences of our research group on the SAM were also included in this review. Results Although the experimental procedures for the SAM are much more laborious than those of the MMCM, the SAM is essential to quantify target xenobiotic(s) in special matrices such as human solid tissues or biles, which remarkably interfere with the usual quantitative analyses. The validation methods for the SAM have been also proposed for the cases in the absence of the blank matrices. Conclusions To our knowledge, this is the first presentation of detailed SAM procedure and its validation, which will facilitate the use of the SAM in forensic toxicology. Especially for its validation, new simple methods have been proposed.

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“…Finally, we tested our sensor's ability to analyze the D-glucose concentration in human urine samples by exploiting the method of standard additions. This method was used because although urine samples are relatively simple, it enabled avoiding any matrix effect and further sample preparation before performing tests 79 . Additionally, it is worth mentioning that we avoided testing artificial urine in this protocol to verify the ability of the developed platform to test real human samples 80 .…”

Section: Glucose Sensingmentioning

confidence: 99%

Chameleon-inspired multifunctional plasmonic nanoplatforms for biosensing applications

et al. 2022

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One of the most fascinating areas in the field of smart biopolymers is biomolecule sensing. Accordingly, multifunctional biomimetic, biocompatible, and stimuli-responsive materials based on hydrogels have attracted much interest. Within this framework, the design of nanostructured materials that do not require any external energy source is beneficial for developing a platform for sensing glucose in body fluids. In this article, we report the realization and application of an innovative platform consisting of two outer layers of a nanocomposite plasmonic hydrogel plus one inner layer of electrospun mat fabricated by electrospinning, where the outer layers exploit photoinitiated free radical polymerization, obtaining a compact and stable device. Inspired by the exceptional features of chameleon skin, plasmonic silver nanocubes are embedded into a poly(N-isopropylacrylamide)-based hydrogel network to obtain enhanced thermoresponsive and antibacterial properties. The introduction of an electrospun mat creates a compatible environment for the homogeneous hydrogel coating while imparting excellent mechanical and structural properties to the final system. Chemical, morphological, and optical characterizations were performed to investigate the structure of the layers and the multifunctional platform. The synergetic effect of the nanostructured system’s photothermal responsivity and antibacterial properties was evaluated. The sensing features associated with the optical properties of silver nanocubes revealed that the proposed multifunctional system is a promising candidate for glucose-sensing applications.

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Origins of the method of standard additions and of the use of an internal standard in quantitative instrumental chemical analyses

Cited by 21 publications

References 35 publications

Metabolomics of Pseudomonas aeruginosa Treated by Atmospheric-Pressure Cold Plasma

Metabolomics of Pseudomonas aeruginosa Treated by Atmospheric-Pressure Cold Plasma

The standard addition method and its validation in forensic toxicology

Chameleon-inspired multifunctional plasmonic nanoplatforms for biosensing applications

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