Quantitative Analysis of Routine Chemical Constituents of Tobacco Based on Thermogravimetric Analysis

Abstract

As the most basic indexes to evaluate the quality of tobacco, the contents of routine chemical constituents in tobacco are mainly detected by continuous-flow analysis at present. However, this method suffers from complex operation, time consumption, and environmental pollution. Thus, it is necessary to establish a rapid accurate detection method. Herein, different from the ongoing research studies that mainly chose near-infrared spectroscopy as the information source for quantitative analysis of chemical components in tobacco, we proposed for the first time to use the thermogravimetric (TG) curve to characterize the chemical composition of tobacco. The quantitative analysis models of six routine chemical constituents in tobacco, including total sugar, reducing sugar, total nitrogen, total alkaloids, chlorine, and potassium, were established by the combination of TG curve and partial least squares algorithm. The accuracy of the model was confirmed by the value of root mean square error for prediction. The models can be used for the rapid accurate analysis of compound contents. Moreover, we performed an in-depth analysis of the chemical mechanism revealed by the result of the quantitative model, namely, the regression coefficient, which reflected the correlation degree between the six chemicals and different stages of the tobacco thermal decomposition process.

Application of PLSR in correlating sensory and chemical properties of middle flue-cured tobacco leaves with honey-sweet and burnt flavour

“…In contrast, flue- and sun-cured tobacco leaves contain higher sugar levels as the metabolising enzymes are rapidly inactivated at the relatively high temperatures employed during this curing [ 52 ]. The total nitrogen, total alkaloid, chloride and potassium contents were 1.48–2.30, 1.56–3.08, 0.20–0.93 and 1.04–1.88 %, respectively, which is in agreement with those of a previous study, wherein Peng et al [ 45 ] found that the total nitrogen, total alkaloids, chloride, and potassium contents in tobacco were 1.63–2.42, 1.48–3.27, 0.07–1.10 and 1.36–2.89 %, respectively.

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“…The routine chemical components in FCT leaves including total/reducing sugars, total alkaloid, total nitrogen, potassium and chloride were determined using a continuous flow analyser (SAN++, Skalar, Holland) according to Peng et al [ 45 ]. And total sugar-nicotine ratio, total nitrogen-nicotine ratio and potassium-chloride ratio are extrapolated values.…”

A critical review of the role of ettringite in binders composed of CAC–PC–C$ and CSA–PC–C$

“…showed that “prolonged storage (24 hours) in methanol, isopropanol or ethanol removed 10–12 moles of water from AFm phases, where isopropanol and ethanol can remove only 1∼2 moles of water from AFt phases and methanol destroys the morphology of AFt phases.” 191 Despite these challenges, TGA is not time‐consuming, easy to execute, and suitable for qualitative and, in some cases (where decomposition peaks do not overlap with other peaks), quantitative analyses for both crystalline and amorphous hydrates. Future research can be initiated by adding chemometric analysis to understand the stepwise decomposition behavior of AFt in cementitious systems from TGA data 192 . Another approach is to combine TGA–DSC (differential scanning calorimetry) to understand the de‐/rehydration of AFt phases in a ternary cementitious system 193 .…”

“…Future research can be initiated by adding chemometric analysis to understand the stepwise decomposition behavior of AFt in cementitious systems from TGA data. 192 Another approach is to combine TGA-DSC (differential scanning calorimetry) to understand the de-/rehydration of AFt phases in a ternary cementitious system. 193 This will also help to modify the thermodynamic data to understand the temperature and water vapor pressure-dependent behavior of ettringite and meta ettringite in an AFt-based system.…”