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Naik YK, Sharma V, Arora S, Seth R. Development and application of DPPH impregnated paper based color sensor disc to detect vegetable oils addition in cow ghee. JOURNAL OF FOOD SCIENCE AND TECHNOLOGY 2023; 60:3014-3023. [PMID: 37786594 PMCID: PMC10542030 DOI: 10.1007/s13197-023-05830-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 08/14/2023] [Accepted: 08/26/2023] [Indexed: 10/04/2023]
Abstract
Ghee is a premium product in Southeast Asia and is prone to adulteration with vegetable oils/ fats. The main aim of the study was to develop an easy-to-use paper-based sensor to detect this adulteration. Hence, a protocol involving hexane and acetonitrile for the extraction of synthetic antioxidants from adulterated ghee and its rapid detection using DPPH was standardized. Paper-based discs impregnated with 4 mM DPPH were developed. The developed paper-based disc sensors worked well and their response time was indirectly proportional to the antioxidant concentration (0.0025-0.02%). Using the developed disc sensors, the palm oil, and sunflower oil added to cow ghee @2.5% or more, and 1% or more, respectively could be detected. The shelf life of the developed sensors was 30 and 90 days at 30 °C and 4-6 °C, respectively. In stored cow ghee samples, the response time of the sensors increased as the storage period of ghee samples increased. The cutoff limit to declare the sample of cow ghee as unadulterated was fixed to 60 min. Based on the response time of the sensor, the level of detection of vegetable oils in stored cow ghee was found to be 2.5%.
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Affiliation(s)
- Yugal Kishor Naik
- Division of Dairy Chemistry, National Dairy Research Institute, Karnal, Haryana India
| | - Vivek Sharma
- Division of Dairy Chemistry, National Dairy Research Institute, Karnal, Haryana India
| | - Sumit Arora
- Division of Dairy Chemistry, National Dairy Research Institute, Karnal, Haryana India
| | - Raman Seth
- Division of Dairy Chemistry, National Dairy Research Institute, Karnal, Haryana India
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Mauricio López-Téllez J, del Pilar Cañizares-Macías M. A paper-based analytical device with in-situ Carrez pretreatment for the determination of total polyphenolic content and antioxidant capacity. Food Chem 2022; 405:134952. [DOI: 10.1016/j.foodchem.2022.134952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/04/2022] [Accepted: 11/10/2022] [Indexed: 11/15/2022]
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Liu X, Tao X, Xu C, Li X, Chen R, Chen Y, Zhong L, Zhu L, Wang X. Evaluation of the photocatalytic performance of molecularly imprinted S-TiO 2 by paper microzones. ENVIRONMENTAL RESEARCH 2021; 199:111258. [PMID: 34029543 DOI: 10.1016/j.envres.2021.111258] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/07/2021] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
The paper microzones method (PMZs) is a green chemical method that uses the principle of the three primary colors of red, green and blue (RGB) to detect the water quality of the droplets on white paper. However, this method is rarely used in the performance evaluation of photocatalysts. The paper details the first use of paper microzones utilized in the evaluation of photocatalyst performance. A sol-gel method was used to prepare molecularly imprinted modified TiO2 photocatalysts for the treatment of different wastewaters, and characterized the catalysts using XRD and several other methods. The reliability of PMZs on the evaluation of photocatalytic activity and selectivity was also analyzed. The following results were obtained: EP-TiO2 catalysts (EP, ethyl paraben, the imprinting molecule) with different S doping levels were synthesized using a one-step sol-gel method, and the best S doping ratio was found to be n(Ti):n(S) 3:1. S-EP-TiO2 was found to be 100% anatase and showed excellent photocatalytic performance, while the PMZs method accurately determined changes in RGB levels for the photocatalytic degradation process of pollutants using S-EP-TiO2 as the photocatalyst. A photocatalytic kinetic analysis showed the PMZs method was quite suitable for the evaluation of photocatalyst activity, but the evaluation of selectivity needs improvement. This method is a promising green chemistry way to evaluate photocatalyst performance and the rapid detection of outdoor sewage water quality.
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Affiliation(s)
- Xian Liu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xiumei Tao
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Chengxiang Xu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Xiaoya Li
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Rui Chen
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Yu Chen
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China
| | - Lingjun Zhong
- Agricultural, Life & Environmental Sciences, University of Alberta, Edmonton, Canada
| | - Lei Zhu
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China.
| | - Xun Wang
- School of Urban Construction, Wuhan University of Science and Technology, Wuhan, 430065, China.
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Sachdev A, Samanta P, Kumar V, Garima, Kandhal K, Matai I. PMAA-CeO 2 nanoparticle-based paper microfluidic device with customized image processing software for antioxidant assay. Anal Bioanal Chem 2020; 412:8197-8209. [PMID: 32995939 DOI: 10.1007/s00216-020-02960-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 09/10/2020] [Accepted: 09/18/2020] [Indexed: 12/21/2022]
Abstract
Despite recent advancements in the field of microfluidic paper-based analytical devices (μPADs), a key challenge remains in developing a simple and efficient μPAD with customized imaging capabilities for antioxidant assays. In the present study, we report a facile approach for μPAD fabrication through the application of transparent nail paint leading to creation of hydrophobic barriers and well-defined channels. The resultant μPADs were then characterized through scanning electron microscopy and contact angle measurements. The resolution and functional features of the fabricated μPAD were amenable to the intended assay. The μPAD's impregnated poly(methacrylic acid) (PMAA)-coated cerium oxide (CeO2) nanoparticles oxidized the 3,3',5,5'-tetramethylbenzidine (TMB) leading to the formation of a blue-colored charge-transfer complex. The addition of different antioxidant standard solutions resulted in a reduction in the blue color in a dose-dependent manner which could be observed visually. The color intensity of the PMAA-CeO2 nanoparticle@TMB oxidation product was inversely proportional to the antioxidant concentration and was measured using customized in-house MATLAB-based image processing software. Importantly, PMAA-CeO2 nanoparticle-based μPADs demonstrated good analytical characteristics and were able to be stored for long periods without any loss of activity. Moreover, potential interferents did not pose any threat to the colorimetric signal read-out for determination of antioxidant activity. The developed method was further applied for the assessment of antioxidant activity in a variety of tea samples and performed satisfactorily in comparison with a commonly used antioxidant detection method. Collectively, the developed μPAD-based platform holds great potential as a low-cost, convenient, portable and reliable method for pursuing various on-site antioxidant assays. Graphical Abstract.
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Affiliation(s)
- Abhay Sachdev
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India. .,Academy of Scientific and Innovative Research (AcSIR-CSIO), Chandigarh, 160030, India.
| | - Pradipta Samanta
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India.,Academy of Scientific and Innovative Research (AcSIR-CSIO), Chandigarh, 160030, India
| | - Vijayesh Kumar
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India
| | - Garima
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India.,Academy of Scientific and Innovative Research (AcSIR-CSIO), Chandigarh, 160030, India
| | - Karina Kandhal
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India
| | - Ishita Matai
- Ubiquitous Analytical Techniques Division, CSIR-Central Scientific Instruments Organization (CSIR-CSIO), Chandigarh, 160030, India. .,Academy of Scientific and Innovative Research (AcSIR-CSIO), Chandigarh, 160030, India.
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