Smartphone-based miniaturized, green and rapid methods for the colorimetric determination of sugar in soft drinks

A novel approach for lactose determination in cow's milk exploiting smartphone-based digital-image photometry

“…As expected, the proposed method also responds to other reducing sugars, which may also yield Cu(I) under the adopted experimental conditions. In fact, similar responses to lactose were observed for glucose, maltose, and galactose, but not for sucrose, which is not a reducing sugar (sucrose determination would be feasible only aer acid hydrolysis 37 ). The selectivity of the proposed procedure is assured as lactose is the only reducing sugar expected to be found in milk, except those submitted to enzymatic lactose hydrolysis under lactase catalysis, yielding glucose and galactose.…”

Smartphone-based rapid and low-cost method for the determination of eugenol content of clove essential oil

“…Images with a region of interest (ROI) of 64 × 64 pixels were captured and processed with the free application Photometrix UVC version 1.0.7 (GHELFER.NET Inc.), available in the Google Play store. The PLS regression multivariate calibration mode was selected in the applicative, using RGB histogram values (SCHLESNER et al, 2022).…”

“…FOOD TECNHOLOGY can efficiently operate. (NADEEM et al, 2022) The popularization of smartphones increased the scientific community's interest due to the possibility of using sensors coupled (or those embedded in the hardware, as cameras) to these devices, which overcomes the need for specific equipment for chemical analysis (AZEVEDO et al, 2008;COSTA et al, 2021;HOLKEM et al, 2021;SCHLESNER et al, 2022). For the colorimetric methods based on smartphones, digital images or videos must be collected, stored, and processed using mathematical algorithms based on color spaces such as RGB (red, green, and blue) (SANTOS et al, 2019).…”

“…COSTA et al (2021) proposed a USB endoscopic camera coupled to a closed 3D printed camera under controlled lighting to standardize the experimental conditions in DIB. A hole was provided to allow the introduction of closed disposable vessels, and a free Android application (PhotoMetrix UVC) was developed for a complete analysis solution to obtain good results for different colorimetric analysis (COSTA et al, 2021;HOLKEM et al, 2021;SCHLESNER et al, 2022). Despite the valuable results, no examples of colorimetric analysis in smartphones were found for the quality control of essential oils by the use of such devices.…”

Development of an automated colorimeter controlled by Raspberry Pi4

“…[2][3][4][5][6] However, despite having many advantages, in order to build automated systems to carry out lab procedures, controller boards may be a simpler solution than smartphones. Nevertheless, the analytical applications that use smartphones have multiplied in recent years, and studies as varied as the determination of phosphates in environmental and industrial samples, 10 studies of tuna adulteration 11 or determination of Cu 2+ in sugar cane spirits 12 and so drinks 13 can be found. The use of smartphones has advantages, but it also has some disadvantages.…”