Raman investigations of Upper Cretaceous phosphorite and black shale from Safaga District, Red Sea, Egypt

Ciobotă, Valerian; Salama, Walid; Jentzsch, Paul Vargas; Tarcea, N.; Rösch, Petra; Kammar, Ahmed El; Morsy, Rania; Popp, Jürgen

doi:10.1016/j.saa.2013.08.059

Cited by 25 publications

(13 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has several applications in chemistry, physics and biology, highlighting studies on the composition of materials in different areas, such as microbiology, arts, archaeology, geology and atmospheric sciences, among many others [17][18][19][20][21][22][23][24]. Since handheld Raman spectrometers with short acquisition times and reasonable spectral resolutions are available, the applicability of this technique in industry has remarkably increased.…”

Section: Introductionmentioning

confidence: 99%

Handheld Raman Spectroscopy for the Distinction of Essential Oils Used in the Cosmetics Industry

Jentzsch

Ramos²,

Ciobotă³

2015

Cosmetics

Self Cite

View full text Add to dashboard Cite

Essential oils are highly appreciated by the cosmetics industry because they have antimicrobial and antioxidant properties, among others. Since essential oils are natural products, their inclusion in cosmetic formulations is a common practice. Currently, low-quality and/or adulterated essential oils can be found on the market; therefore, analytical methods for control are required. Raman spectroscopy is a versatile technique that can be used for quality control tasks; the portability of modern devices expand the analytical possibilities also to in situ measurements. Fifteen essential oils of interest for the cosmetics industry were measured using a handheld Raman spectrometer, and the assignment of the main bands observed in their average spectra was proposed. In most cases, it is possible to distinguish the essential oils by a simple visual inspection of their characteristic Raman bands. However, for essential oils extracted from closely-related vegetable species and containing the same main component in a very high proportion, the visual inspection of the spectra may be not enough, and the application of chemometric methods is suggested. Characteristic Raman bands for each essential oil can be used to both identify the essential oils and detect adulterations. OPEN ACCESSCosmetics 2015, 2 163

show abstract

Section: Introductionmentioning

confidence: 99%

Handheld Raman Spectroscopy for the Distinction of Essential Oils Used in the Cosmetics Industry

Jentzsch

Ramos²,

Ciobotă³

2015

Cosmetics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Five characteristic spectra for each sample were presented, and these spectra were SG smoothed and airPLS baseline corrected. Apatite Ca 5 (PO 4 ) 3 (F, Cl, and OH) is the main mineral containing phosphorus in phosphorite [23]. PO 4 3− is a tetrahedral pentaatomic group with four vibrational modes, namely, symmetrical stretching vibration (V 1 ), double degenerate bending vibration (V 2 ), triple nonsymmetrical stretching vibration (V 3 ), and triple degenerate bending vibration (V 4 ) [20,21,23].…”

Section: Pca-hca and Opls-damentioning

confidence: 99%

“…Apatite Ca 5 (PO 4 ) 3 (F, Cl, and OH) is the main mineral containing phosphorus in phosphorite [23]. PO 4 3− is a tetrahedral pentaatomic group with four vibrational modes, namely, symmetrical stretching vibration (V 1 ), double degenerate bending vibration (V 2 ), triple nonsymmetrical stretching vibration (V 3 ), and triple degenerate bending vibration (V 4 ) [20,21,23]. In Figure 1a, the strong peak near 960 cm −1 belongs to the V 1 mode; the weak peak near 430 cm −1 can be assigned to the V 2 mode; the weak peaks near 1035 cm −1 and 1050 cm −1 correspond to the V 3 modes; and the weak peak near 585 cm −1 is correlated with the V 4 mode [20][21][22][23].…”

Section: Pca-hca and Opls-damentioning

confidence: 99%

“…Raman spectroscopy is a powerful, fast, and nondestructive experimental technique, which has been extensively applied not only in basic scientific researches, but also for practical applications. It can provide physical, chemical, and structural characteristics of investigated samples [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. In the past decade, Raman spectroscopy has been applied for quantitative and qualitative studies of various types of minerals.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Raman Spectroscopy Study of Phosphorites Combined with PCA-HCA and OPLS-DA Models

et al. 2019

View full text Add to dashboard Cite

Phosphorite is a nonrenewable strategic resource, a convenient and rapid method of phosphorite grade identification and classification is important to improve phosphate utilization. In this study, Raman spectroscopy has been combined with principal component analysis and hierarchical clustering analysis (PCA-HCA) and orthogonal partial least squares-discriminant analysis (OPLS-DA) models for an investigation of different grade phosphorite samples. Both the PCA-HCA and OPLS-DA models showed that different grade phosphorite samples can be clearly distinguished by statistically analyzing the Raman spectra after smoothing, baseline correction, and first derivation. In addition, the S-line study on the OPLS-DA model clearly demonstrated that the symmetrical stretching vibrational mode of phosphate near 960 cm−1 had a much more significant contribution than other vibrational modes for the differentiation of different grade phosphorite samples.

show abstract

“…14 Some salient applications of this technique include the study on the composition of materials in different areas, such as microbiology, arts, archaeology, geology, atmospheric sciences, and even planetary exploration, among many others. [15][16][17][18][19][20][21][22][23] Currently, also portable Raman spectrometers are available, with short acquisition times and reasonable spectral resolutions, thus providing reliable information on the characteristics of the measured material in short time. In a recent article, Morillas et al 24 have used a portable Raman spectrometer to evaluate the deterioration of building materials.…”

Section: Introductionmentioning

confidence: 99%

Adulteration of clove essential oil: Detection using a handheld Raman spectrometer

Jentzsch

Gualpa²,

Ramos³

et al. 2017

Flavour & Fragrance J

Self Cite

View full text Add to dashboard Cite

Essential oils are highly appreciated substances used as row materials in the food, cosmetics and pharmaceutical industry. Due to its biological activity and properties, the oil extracted from clove (Eugenia caryophyllus) has gained economic importance, and this is the main reason why adulterated clove essential oils have appeared in the market. The detection of adulteration is a fundamental task to ensure the quality of industrial products and, therefore, to protect the consumers from potential harmful products. In order to test the suitability of Raman spectroscopy to detect adulteration in essential oils, nineteen samples of commercial clove essential oil were measured with a handheld device and their Raman spectra analyzed. The Raman spectrum of a sample of authentic clove essential oil is dominated by bands of its main component eugenol. Principal component analysis (PCA) and independent component analysis (ICA) were applied in order to identify the adulterated samples and to assess the quality of the authentic samples. It was found that two samples were adulterated by the addition of benzyl alcohol and a third one by the addition of a vegetable oil. The adulteration by addition of benzyl alcohol is easy to detect by a quick inspection of the Raman spectrum, since this compound shows an intense band at 1003 cm‐1. However, the detection of adulteration by the addition of other substances (e.g., vegetable oils) requires the application of multivariable analysis, i.e., PCA or ICA. The results show that Raman spectroscopy is an appropriate technique for quality control of clove essential oil.

show abstract

Raman investigations of Upper Cretaceous phosphorite and black shale from Safaga District, Red Sea, Egypt

Cited by 25 publications

References 49 publications

Handheld Raman Spectroscopy for the Distinction of Essential Oils Used in the Cosmetics Industry

Handheld Raman Spectroscopy for the Distinction of Essential Oils Used in the Cosmetics Industry

Raman Spectroscopy Study of Phosphorites Combined with PCA-HCA and OPLS-DA Models

Adulteration of clove essential oil: Detection using a handheld Raman spectrometer

Contact Info

Product

Resources

About