Smartphone-based technique for the determination of a titration equivalence point from an RGB linear-segment curve with an example application to miniaturized titration of sodium chloride injections

Ruttanakorn, Kanong; Phadungcharoen, Noppharat; Laiwattanapaisal, Wanida; Chinsriwongkul, Akhayachatra; Rojanarata, Theerasak

doi:10.1016/j.talanta.2021.122602

Cited by 18 publications

(9 citation statements)

References 51 publications

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“…The proposed method was considered accurate as the recovery percentage was ranged between 100.4-102.4 %. This range is in accordance with that provided for colorimetric assays using digital images (12)(13)(14) .…”

Section: Precision Was Evaluated By Repeatability (Intraday Precision...supporting

confidence: 86%

“…Furthermore, freely available programs can be used in digital image acquisition for: (a) image processing (Photometrix Pro ® ), and (b) evaluating the conformity of the proposed method with the GAC principles (10,11) . DIC is based on digital image capture, decomposition in the Red-Green-Blue (RGB) system, and the determination of a linear correlation between the sample concentration and the RGB signal (12) . In the proposed study, the determination of ethanol using colorimetric methods such as DIC could be achieved through its reaction with phenolphthalein (PHP) in a basic medium, resulting in the production of a pink-colored product.…”

Section: Introductionmentioning

confidence: 99%

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SmartAnalysis: A sustainable digital-image colorimetry method for ethanol determination in alcohol-based hand sanitizer

Machado Escobar,

Donadel Malesuik,

Smanioto Barin

et al. 2024

Ars Pharm

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Introduction: The consumption of alcohol-based hand sanitizers has increased significantly after the pandemic caused by SARS-CoV-2. Despite the conclusion of the health emergency declared by the WHO in 2023, the habit of sanitizing hands with ethanol-based gel sanitizers has been globally adopted by the population. Since general methods described in official compendia for ethanol determination such as gas chromatography or distillation are laborious and not-specific to carbomer-containing gels, this work proposes an alternative method based on digital image colorimetry. Method: The digital image (provided by ethanol-phenolphthalein reaction) was captured and transformed into an analytical signal based on the Red-Green-Blue system. The image acquisitions were performed using a Samsung Galaxy J6 smartphone, and the signals were generated using the Photometrix Pro® free program. The method was validated in accordance with ICH and applied in commercial samples. Additionally, the proposed method was evaluated for its environmental impact using the Green Analytical Process Index (GAPI) tool. Pictograms were generated using the ComplexGAPI® free program. Results: Green channel exhibited a linear response in the calibration curves for ethanol concentrations ranging from 5 to 40 % (w/w) in acidic medium. The method showed linearity, precision, accuracy, and robustness. Conclusions: The proposed method presented as main advantages the use of low-cost and easy-to-handle devices and reduced reagent consumption, in accordance with green analytical chemistry principles.

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Section: Precision Was Evaluated By Repeatability (Intraday Precision...supporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

SmartAnalysis: A sustainable digital-image colorimetry method for ethanol determination in alcohol-based hand sanitizer

Machado Escobar,

Donadel Malesuik,

Smanioto Barin

et al. 2024

Ars Pharm

View full text Add to dashboard Cite

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“…Reports − show that various brands of smartphones can be used for weak light collection in point of need devices, and we then explored the performance of different brands (namely, iPhone 11, Xiaomi 11 pro, and HUAWEI P30 pro) for the sATD. As shown in Figure a, it is interesting to see that even for the same concentration of bacteria, the color of the images varies among brands, and the GB values from the iPhone 11, Xiaomi 11 pro, and HUAWEI P30 pro were found to be 233, 237; 253, 241; and 250, 211, respectively.…”

Section: Resultsmentioning

confidence: 99%

Smartphone-Assisted Three Dimensional-Printed Acute Toxicity Detection: Mitigating the Impact of Sample Color

Liu,

Wang,

Yang

et al. 2024

ACS EST Water

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Accurate and rapid detection of toxicity in water bodies is critical for environmental monitoring, especially during environmental emergencies. Currently, smartphone-based sensors capable of detecting toxicity in colored water samples. This paper introduces the smartphone-assisted three-dimensional (3D)-printed acute toxicity detector (sATD), a novel device designed to quickly measure the inhibition rate on luminescent bacteria, thereby providing an efficient and affordable means for on-site acute toxicity assessment. To ensure stable image acquisition, the entire device is enclosed in a 3D-printed, sealed black box. Three different brands of smartphones were examined for the best performance. The sATD-IR (smartphone-assisted 3D-printed acute toxicity detector - inhibition rate) offers a straightforward and precise method for on-site luminescence inhibition detection, facilitating monitoring of acute toxicity in regional water. The sATD-IR system was validated by using a variety of samples. For example, the half-maximal inhibitory concentration (IC50) value for the heavy metal Zn2+ using the sATD-IR system was 1.727 mg/L, which is very close to the IC50 value of 1.656 mg/L obtained using the standard method. More importantly, our investigation examined how color can affect sample toxicity detection. A correction algorithm based on RGB analysis to accurately determine the inhibition rate for colored samples was proposed and validated.

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“…In this way, the same image processing technique was used to estimate the specific interfacial area as in our previous work . The technique is based on digital image colorimetry to separate the interface regions between the continuous and dispersed phases . The accuracy of the achieved separation level is on the order of magnitude of image pixels.…”

Section: Resultsmentioning

confidence: 99%

Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

Santiago,

Silva,

Sobrinho

et al. 2023

Ind. Eng. Chem. Res.

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Conventional methods for removing sulfur compounds perform poorly when streams are treated with refractory compounds such as dibenzothiophene (DBT) and its derivatives. Current studies have directed efforts to investigate extractive desulfurization (EDS) using microdevices. Microdevices are units with micrometer-sized channels that enhance the mass and heat transfer phenomena. For EDS in microdevices to be viable, it is essential to choose the appropriate extractor solvent. Among the possibilities, an excellent candidate is polyethylene glycol (PEG). The present work aims to analyze the use of PEG 300 for EDS in microfluidics using hexadecane as a model fuel to emulate diesel. The experiments followed the logic of a fractional experimental design that allowed extractive solvent insights into deep desulfurization. In addition, the mass transfer phenomena involved and the application of the best experimental conditions in a real diesel sample were evaluated. The results obtained with model fuel were able to achieve 99.36% DBT removal with a 1.0 min residence time, a 1:1 volumetric ratio, and three extraction cycles. Furthermore, by applying the best experimental conditions to diesel, the total sulfur concentration decreased from 1646 to 312 ppm, resulting in an extractive efficiency of 81.04%.

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Smartphone-based technique for the determination of a titration equivalence point from an RGB linear-segment curve with an example application to miniaturized titration of sodium chloride injections

Cited by 18 publications

References 51 publications

SmartAnalysis: A sustainable digital-image colorimetry method for ethanol determination in alcohol-based hand sanitizer

SmartAnalysis: A sustainable digital-image colorimetry method for ethanol determination in alcohol-based hand sanitizer

Smartphone-Assisted Three Dimensional-Printed Acute Toxicity Detection: Mitigating the Impact of Sample Color

Diesel Desulfurization Experiments in Microchannels with PEG 300: An Understanding of Extractive Deep Desulfurization

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