Optical pH Sensing in Milk: A Small Puzzle of Indicator Concentrations and the Best Detection Method; Chemosensors; Vol. 9, iss. 7
| Parent link: | Chemosensors Vol. 9, iss. 7.— 2021.— [177, 9 p.] |
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| Summary: | Title screen Optical chemical sensors can yield distinctively different responses that are dependent on the method applied for readout and evaluation. We therefore present a comprehensive study on the pH determined non-continuously with optical sensors in real milk samples by either photometry or colorimetry (via the RGB-readout of digital images) compared to the pH values obtained electrochemically by potentiometry. Additionally, the photometric determination of pH was conducted with single-wavelength and a dual wavelength ratiometric evaluation of the absorbance. It was found that both the precision and accuracy of the pH determined by photometry benefit from lower concentrations of bromocresol purple, which served as the pH indicator inside the sensor membrane. A further improvement is obtained by the ratiometric evaluation of the photometric sensor response. The pH values obtained from the colorimetric evaluation, however, gain in precision and accuracy if a higher concentration of the indicator is immobilized inside the sensor membrane. This has a major impact on the future fabrication of optical pH sensor membranes because they can be better tuned to match to the most precise and accurate range of the planned detection method. |
| Sprog: | engelsk |
| Udgivet: |
2021
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| Fag: | |
| Online adgang: | http://earchive.tpu.ru/handle/11683/69111 https://doi.org/10.3390/chemosensors9070177 |
| Format: | MixedMaterials Electronisk Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=665320 |
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| 200 | 1 | |a Optical pH Sensing in Milk: A Small Puzzle of Indicator Concentrations and the Best Detection Method |f O. B. Voskoboynikova, A. V. Sukhanov, A. Duerkop | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 31 tit.] | ||
| 330 | |a Optical chemical sensors can yield distinctively different responses that are dependent on the method applied for readout and evaluation. We therefore present a comprehensive study on the pH determined non-continuously with optical sensors in real milk samples by either photometry or colorimetry (via the RGB-readout of digital images) compared to the pH values obtained electrochemically by potentiometry. Additionally, the photometric determination of pH was conducted with single-wavelength and a dual wavelength ratiometric evaluation of the absorbance. It was found that both the precision and accuracy of the pH determined by photometry benefit from lower concentrations of bromocresol purple, which served as the pH indicator inside the sensor membrane. A further improvement is obtained by the ratiometric evaluation of the photometric sensor response. The pH values obtained from the colorimetric evaluation, however, gain in precision and accuracy if a higher concentration of the indicator is immobilized inside the sensor membrane. This has a major impact on the future fabrication of optical pH sensor membranes because they can be better tuned to match to the most precise and accurate range of the planned detection method. | ||
| 461 | |t Chemosensors | ||
| 463 | |t Vol. 9, iss. 7 |v [177, 9 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a pH sensor | |
| 610 | 1 | |a optical | |
| 610 | 1 | |a photometry | |
| 610 | 1 | |a colorimetry | |
| 610 | 1 | |a potentiometry | |
| 610 | 1 | |a digital image | |
| 610 | 1 | |a датчики | |
| 610 | 1 | |a фотометрия | |
| 610 | 1 | |a колориметрия | |
| 610 | 1 | |a потенциометрия | |
| 610 | 1 | |a цифровые изображения | |
| 700 | 1 | |a Voskoboynikova |b O. B. |c Specialist in the field of informatics and computer technology |c Senior Lecturer of Tomsk Polytechnic University |f 1990- |g Olga Borisovna |3 (RuTPU)RU\TPU\pers\46955 |9 22554 | |
| 701 | 1 | |a Sukhanov |b A. V. |c specialist in the field of scientific activity |c Leading expert of Tomsk Polytechnic University, Candidate of chemical sciences |f 1983- |g Aleksey Viktorovich |3 (RuTPU)RU\TPU\pers\31389 |9 15561 | |
| 701 | 1 | |a Duerkop |b A. |g Axel | |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Инженерная школа информационных технологий и робототехники |b Отделение автоматизации и робототехники |3 (RuTPU)RU\TPU\col\23553 |
| 801 | 2 | |a RU |b 63413507 |c 20211209 |g RCR | |
| 856 | 4 | |u http://earchive.tpu.ru/handle/11683/69111 | |
| 856 | 4 | |u https://doi.org/10.3390/chemosensors9070177 | |
| 942 | |c CF | ||