Non-destructive fraud detection in rosehip oil by MIR spectroscopy and chemometrics

Abstract

Rosehip oil (Rosa eglanteria L.) is an important oil in the food, pharmaceutical and cosmetic industries. However, due to its high added value, it is liable to adulteration with other cheaper or lower quality oils. With this perspective, this work provides a new simple, fast and accurate methodology using mid-infrared (MIR) spectroscopy and partial least squares discriminant analysis (PLS-DA) as a means to discriminate authentic rosehip oil from adulterated rosehip oil containing soybean, corn and sunflower oils in different proportions. The model showed excellent sensitivity and specificity with 100% correct classification. Therefore, the developed methodology is a viable alternative for use in the laboratory and industry for standard quality analysis of rosehip oil since it is fast, accurate and non-destructive.

Preprocessing methods for near‐infrared spectrum calibration

“…Several preprocessing schemes are selected for evaluation based on the summary in Table 1: Single preprocessing schemes: None, SG, SG1D, SG2D, MC, AS, SNV, MMN, RNV25, RNV50, RNV75, AN, VN, MSC, OSC, NAS, and ALS; these count as 17 methods. SGxD followed by MC, AS, SNV, MMN, RNV25, RNV50, RNV75, AN, VN, MSC, OSC, NAS, or ALS; these count as 39 methods. MC, AS, SNV, MMN, AN, VN, MSC, OSC, NAS, or ALS followed by SGxD; these count as 30 methods. The methods contained in the second group and the third group can be frequently found in the literature. OSC + normalization 56 : OSC + MC, OSC + AS, OSC + SNV, OSC + VN, OSC + AN, OSC + MMN; these count as six methods. The two‐method permutations composed of VN, MC, SNV 32,50,52,54,55 count as 6 methods. Other methods include AN + SGxD + MC, 59 SGxD + AN + MC, 58 MSC + SGxD + MC, 25 and ALS + SNV 49 ; these count as 10 methods. …”

Attenuated total reflectance–Fourier transform infrared (ATR–FTIR) spectroscopy coupled with chemometric analysis for detection and quantification of adulteration in lavender and citronella essential oils

“…In this context, infrared (IR) spectroscopy is an alternative method to the use of nuclear magnetic resonance, mass spectroscopy (MS), or liquid chromatography techniques for the authentication and quality analysis of several industrial products and EOs. [8][9][10][11] IR spectroscopy is a well-established methodology used for decades in the medicine industry and in food chemistry for quality control due to its several advantages with respect to rapidity, accuracy, and reproducibility. The technology behind this technique is the measurement of the vibration frequencies of chemical bonds in functional groups, such as C−C, C=C, C−H, O −H, and C=O, upon radiation absorption in the mid-IR region (ranging from 4,000 to 400 cm −1 ).…”

NMR-based and chemometric approaches applicable to adulteration studies for assessment of the botanical origin of edible oils

“…The chemical profile of fatty acids is usually assessed by chromatography, ultraviolet-visible spectrophotometry, Fourier-transform infrared spectroscopy, fluorimetry, and mass spectrometry, among other techniques (Santana et al 2016). However, nuclear magnetic resonance (NMR) has been established as a powerful technique for evaluation of fatty acids because it mainly involves direct analysis of the samples, avoiding toxic organic solvents and long preparation times (Castejón et al 2014).…”