Vibrational Analysis and Thermal Behavior of Salvia hispanica, Nigella sativa and Papaver somniferum Seeds

Abstract

Introduction: Salvia hispanica L., Nigella sativa L. and Papaver somniferum L. are involved in opiate-dependent behavior. It is known that the seeds of these three herbs contain high amounts of antioxidants, which are helpful in disease prevention, but further research is needed on some of their other phytochemical components (terpene alkaloids, benzoquinones and others), which are claimed to affect human opioid receptors. Methods: Seeds from the three afore mentioned plants have been studied by ATR-FTIR vibrational spectroscopy and thermo analytical techniques (TG/DTG, DTA and DSC). Results: The infrared spectrum has confirmed the presence of the ester carbonyl of terpenoid alkaloids (such as nigellamine) and the fully conjugated cyclic dione structure of quinones (e.g., thymoquinone). As regards the thermal stability of these seeds, small differences have been observed in their thermal profiles (endothermic effects at around 333ºC for chia, 268ºC for black cumin and 319ºC for poppy seeds), which can be ascribed to their different content in carbohydrates. Conclusions: The functional groups of the main active constituents and the thermal behavior of these three seeds have been elucidated.

Nutritional, Spectral and Thermal Characteristic of Lamiaceae Seeds

“…The absence of the bands at 1015 cm -1 and ~878 cm -1 (apart from that of 795 cm -1 ) is also a common feature with the Asteraceae (unpublished results). The absence of bands at 1574, 1563, 1336, 1138, 1076, 857, 778 and 757 cm -1 has been previously observed for Salvia hispanica L. [28]. Absorbance (a.u.…”

The Effect of Light on Antioxidant Properties and Metabolic Profile of Chia Microgreens

“…The FTIR spectra of the three chia samples under the study are depicted in Figure 5, and their main bands are summarized in Table 2. It can be observed that they are similar, in particular, the samples exposed to light for 24 and 48 h. A large number of peaks appeared in the region from 1000 to 3000 cm −1 , indicating that chia microgreens have a rich chemical composition (proteins, lipids, carbohydrates) [18]. More precisely, the band located around 3290 cm −1 represents N-H stretching vibrations that are caused by proteins [20].…”

“…Additionally, the fingerprint region between 1000 and 1500 cm −1 is where amide II and the functional groups of nucleic acid and carbohydrates contribute to these absorption bands. A large number of peaks appeared in the region from 1000 to 3000 cm −1 , indicating that chia microgreens have a rich chemical composition (proteins, lipids, carbohydrates) [18]. More precisely, the band located around 3290 cm −1 represents N-H stretching vibrations that are caused by proteins [20].…”

“…Due to its extensive applicability to the different kinds of tissues and a small amount of sample needed for analyses, this technique has found broad applications in the analyses of metabolic profiles of different plant species [17]. FTIR spectroscopy is used for the determination of antioxidant potential and health benefits in chia [18][19][20], as well as other medicinal plants [17].…”

An exploration of the effects of low-pressure plasma discharge on the physicochemical properties of chia (Salvia hispanica L.) flour

“…It is to be noted that the peaks associated with the phytyl chain of tocopherols (about 2900 cm −1 ) did not show considerable difference in their intensity. The sharp peak noticed at 1744 cm −1 was a consequence of vibrations from (CO) ester of terpene alkaloids (Carrión-Prieto et al 2017). However, minor contribution of vibrations from δ(N -H) (amide III) of proteins to the peak at 1240 cm −1 could not be over-ruled.…”