| Title: | Converting electronic nose into opto-electronic nose by mixing MoS(2) quantum dots with organic reagents: Application to recognition of aldehydes and ketones and determination of formaldehyde in milk |
| Author(s): | Mostafapour S; Mohamadi Gharaghani F; Hemmateenejad B; |
| Address: | "Chemistry Department, Shiraz University, Shiraz, Iran. Chemistry Department, Shiraz University, Shiraz, Iran; Medicinal and Natural Products Chemistry Research Center, Shiraz University of Medical Sciences, Shiraz, Iran. Electronic address: hemmatb@shirazu.ac.ir" |
| DOI: | 10.1016/j.aca.2021.338654 |
| ISSN/ISBN: | 1873-4324 (Electronic) 0003-2670 (Linking) |
| Abstract: | "A new colorimetric sensor array based on mixing of Molybdenum disulfide quantum dots (MoS(2) QDs) and organic reagents is introduced in this study. MoS(2) QDs shows a specific and higher affinity to oxygen functionalized volatile compounds like aldehydes and ketones. Therefore, this designed sensor array is used for classification of eight different aldehydes and ketones based on Linear Discriminate Analysis (LDA) at first. The classification accuracy of 96% and 83% was obtained for training and prediction phases, respectively. Then the introduced colorimetric sensor array is used for the semi-quantitative and quantitative analysis of formaldehyde in milk samples. Formaldehyde is an adulteration that is added to the milk for increasing the storage time. Cow milk samples were provided directly from dairy farmer and from supermarkets and were spiked by formaldehyde in the concentration range of 1-25 ppm. The response of sensor array to these samples were analyzed by partial least squares regression (PLS-R) method and were calibrated for concentration of formaldehyde. The PLSR results (R(2) = 0.94 and RMSEC = 2.36) shows that proposed sensor is useable in direct analysis of formaldehyde in milk as a complex matrix" |
| Keywords: | Aldehydes Animals Electronic Nose Formaldehyde Indicators and Reagents Ketones Milk Molybdenum *Quantum Dots Aldehyde and ketone Colorimetric sensor array E-nose MoS(2) QDs; |
| Notes: | "MedlineMostafapour, Sara Mohamadi Gharaghani, Fereshte Hemmateenejad, Bahram eng Netherlands 2021/06/07 Anal Chim Acta. 2021 Jul 25; 1170:338654. doi: 10.1016/j.aca.2021.338654. Epub 2021 May 18" |
