Evaluation of Turmeric Powder Adulterated with Metanil Yellow Using FT-Raman and FT-IR Spectroscopy

Dhakal, Shobhakar; Chao, Kuanglin; Schmidt, Walter F.; Qin, Jianwei; Kim, Moon J.; Chan, Diane E.

doi:10.3390/foods5020036

Cited by 119 publications

(74 citation statements)

References 56 publications

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“…The 1631 cm −1 peak in turmeric spectrum is due to the carbonyl group. The carbonyl group is not present in metanil yellow [32]. Therefore, the 1631 cm −1 peak is most definitive for turmeric identification.…”

Section: Detection Of Metanil Yellow Contamination In Turmeric Powdermentioning

confidence: 99%

“…Turmeric (Curcuma long L.), which is a yellow colored herbaceous root from ginger family, is commonly used for food seasoning, for medicinal purpose and as dietary supplements [32]. Anti-inflammatory, anticarcinogenic, antioxidant, wound-healing effects are some of the medicinal value that is attributed to turmeric [47][48][49][50].…”

Section: Application To Authenticate Turmeric Powdermentioning

confidence: 99%

“…Due to the isolation of curcumin from turmeric for medicinal and cosmetic purposes, it is adulterated with color dyes as a substitute for curcumin [60]. Metanil yellow (C 18 H 14 N 3 NaO 3 S), a yellow color toxic azo dye, is added to turmeric for brighter color and appealing appearance [32]. Toxicologically, metanil yellow is classified as a CII category substance by the Joint Food and Agricultural Organization of the United Nations (FAO) and World Health Organization (WHO) expert committee on Food Additives [61].…”

Section: Application To Authenticate Turmeric Powdermentioning

confidence: 99%

“…Figure 4 shows the Raman spectra of turmeric powder and metanil yellow. The yellow color appearance of turmeric and metanil yellow is due to the similarly extended conjugation in both the chemicals [32]. However, a different chemical composition results in different vibrational modes specific to their chemical structure.…”

Section: Detection Of Metanil Yellow Contamination In Turmeric Powdermentioning

confidence: 99%

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A 1064 nm Dispersive Raman Spectral Imaging System for Food Safety and Quality Evaluation

et al. 2018

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Raman spectral imaging is an effective method to analyze and evaluate the chemical composition and structure of a sample, and has many applications for food safety and quality research. This study developed a 1064 nm dispersive Raman spectral imaging system for surface and subsurface analysis of food samples. A 1064 nm laser module is used for sample excitation. A bifurcated optical fiber coupled with Raman probe is used to focus excitation laser on the sample and carry scattering signal to the spectrograph. A high throughput volume phase grating disperses the incoming Raman signal. A 512 pixels Indium-Gallium-Arsenide (InGaAs) detector receives the dispersed light signal. A motorized positioning table moves the sample in two-axis directions, accumulating hyperspectral image of the sample by the point-scan method. An interface software was developed in-house for parameterization, data acquisition, and data transfer. The system was spectrally calibrated using naphthalene and polystyrene. It has the Raman shift range of 142 to 1820 cm −1 , the spectral resolution of 12 cm −1 at full width half maximum (FWHM). The spatial resolution of the system was evaluated using a standard resolution glass test chart. It has the spatial resolution of 0.1 mm. The application of the system was demonstrated by surface and subsurface detection of metanil yellow contamination in turmeric powder. Results indicate that the 1064 nm dispersive Raman spectral imaging system is a useful tool for food safety and quality evaluation.

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Section: Detection Of Metanil Yellow Contamination In Turmeric Powdermentioning

confidence: 99%

Section: Application To Authenticate Turmeric Powdermentioning

confidence: 99%

Section: Application To Authenticate Turmeric Powdermentioning

confidence: 99%

Section: Detection Of Metanil Yellow Contamination In Turmeric Powdermentioning

confidence: 99%

See 2 more Smart Citations

A 1064 nm Dispersive Raman Spectral Imaging System for Food Safety and Quality Evaluation

et al. 2018

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“…Spectral analysis showed that the FT-IR method in this study could detect the metanil yellow at the 5% concentration, while the FT-Raman method appeared to be more sensitive and could detect the metanil yellow at the 1% concentration. [39] Recently, Sahne et al have carried out comparative study of extraction of bioactive compound curcumin from turmeric (C. longa) through different routes. [40] In this experiment, extraction of curcumin was carried out through different extraction methods such as microwave-assisted, ultrasound-assisted, and enzyme-assisted extractions.…”

Section: Phytochemical Analysismentioning

confidence: 99%

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Ashraf¹

2017

IJGP

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Curcuma longa Linn. is well-known and valued medicinal plant. It has a long history of traditional uses ranging from folk medicine to several culinary preparations. The phytochemical, pharmacological, and molecular studies of C. longa are reviewed. The rhizome is rich in essential oils, and various numbers of chemical constituents with biomedical significance have been isolated from it. The management of indigenous knowledge by appropriate documentation is recommended. This review was compiled to provide recent consolidated information covering different aspects of the plant, phytochemical, pharmacological, and molecular study to provide a basis on which to plan future studies and to promote sustainable use of C. longa.

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Large‐Scale, Ultrasensitive, Highly Reproducible and Reusable Smart SERS Platform Based on PNIPAm‐Grafted Gold Grating

et al. 2017

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A smart plasmonic sensor based on periodic gold gratings grafted with poly(N‐isopropyl acrylamide) (PNIPAm) has been designed and realized. A periodic gold structure was created on the polymer backing with an excimer laser (1×2 cm2 modified area) and was subsequently covered by thin gold film. In the next step, a 7 nm thick PNIPAm layer was grafted to the gold surface through a two‐step procedure: covalent attachment of 4‐carboxybenzil groups followed by carboxyl groups activation and their coupling with amino‐terminated PNIPAm. Surface properties of the prepared structure and their switchable behavior were investigated using refractometry, wettability measurements, AFM in water, cyclic voltammetry, and pH‐ and temperature‐dependent Z‐potential measurements. The structure enables effective entrapment and SERS detection of azo dyes, significant reduction of minimal detectable concentration of target molecules, and a detection limit down to femtomolar concentrations. Excitation of plasmons on the well‐ordered surface structure also gives excellent reproducibility for SERS along the particular sample surface and as well as on different samples. Additionally, the reversible switching of wettability under repeated temperature changes on the gold plasmonic platform allows multiple uses of the developed system.

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Evaluation of Turmeric Powder Adulterated with Metanil Yellow Using FT-Raman and FT-IR Spectroscopy

Cited by 119 publications

References 56 publications

A 1064 nm Dispersive Raman Spectral Imaging System for Food Safety and Quality Evaluation

A 1064 nm Dispersive Raman Spectral Imaging System for Food Safety and Quality Evaluation

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Large‐Scale, Ultrasensitive, Highly Reproducible and Reusable Smart SERS Platform Based on PNIPAm‐Grafted Gold Grating

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