Discrimination and Blend Ratio Estimation between Arabica and Robusta Coffee Species Using Direct Inlet Probe/Ion Attachment Ionization Mass Spectrometry

Okumura, Ryohei; Kumata, Noriko; Tsugoshi, Takahisa; Mishima, Yuji; Koizumi, Hideki

doi:10.2116/bunsekikagaku.63.825

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“…The discrimination of styrene random/block copolymer has been conducted using thermogravimetry-differential thermal analysis/photo ionization-quadrupole mass spectrometry (TG-DTA/PI-QMS). 26 An ion attachment ionization-quadrupole mass spectrometry equipped with direct inlet probe (DIP/IA-QMS) has been applied to analyze poly(vinyl alcohol) (PVA), 27 PVA-methylcellulose binder, 28 and polybrominated diphenyl ethers, 22 to discriminate vegetable oils 30 and coffee species, 31 and to estimate the thermal decomposition process of polystyrene. 25 In CM-PEI resin, the CM-PEI group exists on the surface of the porous methacrylate resin.…”

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confidence: 99%

Thermal Decomposition Behavior of a Chelating Resin Immobilizing Carboxymethylated Polyethyleneimine: Possibility of Estimation of Carboxymethylation Rate

et al. 2019

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Chelating resins immobilizing carboxymethylated polyethyleneimine (CM-PEI) with different carboxymethylation rates were prepared. The thermal decomposition behavior of CM-PEI resins was investigated using thermogravimetrydifferential thermal analysis/photo ionization-quadrupole mass spectrometry (TG-DTA/PI-QMS) and ion attachment ionization-quadrupole mass spectrometry equipped with direct inlet probe (DIP/IA-QMS). The obtained results suggested that the carboxymethyl group decomposed at relatively low temperature (150 C-300 C); the peak areas at m/z 45 and 59 in TG-DTA/PI-QMS and m/z 58, 70, and 72 in DIP/IA-QMS significantly increased with increasing carboxymethylation rate. These relationships should be useful for estimating the carboxymethylation rate of CM-PEI resin.

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