Quality control with time-domain NMR

Todt, Harald; Burk, Wolfgang; Guthausen, Gisela; Guthausen, Andreas; Kamlowski, A.; Schmalbein, Dieter

doi:10.1002/1438-9312(200112)103:12<835::aid-ejlt835>3.0.co;2-p

Cited by 47 publications

(7 citation statements)

References 14 publications

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“…The two methods produce similar results (correlation coefficient for TD-NMR and Soxhlet extractor = 0.9773) (Todt et al, 2001). There are several disadvantages of the TD-NMR method.…”

Section: Time Domain Nuclear Magnetic Resonance (Td-nmr) Is Another Msupporting

confidence: 69%

Screening and Identification of Everglades Algal Isolates for Biodiesel production

Narendar¹

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“…The two methods produce similar results (correlation coefficient for TD-NMR and Soxhlet extractor = 0.9773) (Todt et al, 2001). There are several disadvantages of the TD-NMR method.…”

Section: Time Domain Nuclear Magnetic Resonance (Td-nmr) Is Another Msupporting

confidence: 69%

Screening and Identification of Everglades Algal Isolates for Biodiesel production

Narendar¹

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“…The differences between the two methods can be explained by the inaccuracy introduced by using an average F factor in the Direct method. 10,11 If the value of this average F factor is different from the one actually needed for correct extrapolation of the amount of solid in theˇform, this will introduce a systematic error. In contrast, a relatively good match between the TRDD and Indirect SFC values can be observed ( Fig.…”

Section: Precision and Accuracy Of Transverse Relaxation Decay Deconvmentioning

confidence: 99%

“…9 Since then, several NMR SFC methods have successfully been applied in fat technology. 10 The Direct method relies on sampling two points of the Free Induction Decay (FID), and from these, it calculates an SFC value. 9 However, owing to dead-time problems, an extrapolation factor F is needed to obtain the magnetisation at time zero.…”

Section: Introductionmentioning

confidence: 99%

Rapid phase‐compositional assessment of lipid‐based food products by time domain NMR

Trezza

Haiduc

Goudappel

et al. 2006

Magnetic Reson in Chemistry

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In food science and technology, assessment of phase-compositional behaviour of lipids is critical for understanding many product properties and for effective process control. Time Domain NMR is a rapid and easy-to-handle technique, and is already well appreciated as a tool for phase-compositional assessment in foods. The phase-compositional detail that can be obtained with the established methodology is limited, however. In this work, we set out to obtain more phase-compositional details of lipids as currently feasible with the already established 'classical' NMR methods. We deployed a combined FID-CPMG experiment, and analyzed the Transversal Relaxation Decays by Deconvolution (TRDD) with semi-empirical mathematical functions for solid, semi-solid and liquid components. Within the solid component, different lipid crystal polymorphs can be discerned in a quantitative manner, i.e. alpha, beta and beta'. The TRDD method was validated against established NMR SFC methods, in terms of accuracy ('trueness') and precision. The solid fat content (SFC) of a large collection of fat blends was measured by the commonly employed NMR Direct and Indirect SFC methods and a good correlation with the results of the TRDD was observed, thereby demonstrating accuracy. Furthermore, TRDD was found to be equally precise as the established NMR SFC methods.

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“…[20][21][22][23][24][25][26][27] Some well-known examples of applications using low-field NMR include the study of droplet sizes in emulsions, [28][29][30][31] the determination of molecular dynamics in polymeric materials [32][33][34][35][36][37][38] and the quantification of hard/soft ratios in multicomponent materials. [2][3][4]39,40] Low-field NMR is a promising candidate for use as an online sensor in process analytics and control as a result of its design, robustness and simplicity. [41][42][43] Low-field NMR setups can be implemented in process environments and offer complementary information to other online techniques such as near-infrared (NIR) spectroscopy, viscosimetry or light scattering.…”

Section: Introductionmentioning

confidence: 99%

Hyphenated low‐field NMR techniques: combining NMR with NIR, GPC/SEC and rheometry

Räntzsch

Wilhelm

Guthausen

2015

Magnetic Reson in Chemistry

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Hyphenated low-field NMR techniques are promising characterization methods for online process analytics and comprehensive offline studies of soft materials. By combining different analytical methods with low-field NMR, information on chemical and physical properties can be correlated with molecular dynamics and complementary chemical information. In this review, we present three hyphenated low-field NMR techniques: a combination of near-infrared spectroscopy and time-domain NMR (TD-NMR) relaxometry, online (1) H-NMR spectroscopy measured directly after size exclusion chromatographic (SEC, also known as GPC) separation and a combination of rheometry and TD-NMR relaxometry for highly viscous materials. Case studies are reviewed that underline the possibilities and challenges of the different hyphenated low-field NMR methods. Copyright © 2015 John Wiley & Sons, Ltd.

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Quality control with time-domain NMR

Cited by 47 publications

References 14 publications

Screening and Identification of Everglades Algal Isolates for Biodiesel production

Screening and Identification of Everglades Algal Isolates for Biodiesel production

Rapid phase‐compositional assessment of lipid‐based food products by time domain NMR

Hyphenated low‐field NMR techniques: combining NMR with NIR, GPC/SEC and rheometry

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