Nuclear magnetic resonance (NMR) spectroscopy is a robust method, which can rapidly analyze mixtures at the molecular level without requiring separation and/or purification steps, making it ideal for applications in food science. Despite its increasing popularity among food scientists, NMR is still an underutilized methodology in this area, mainly due to its high cost, relatively low sensitivity, and the lack of NMR expertise by many food scientists. The aim of this review is to help bridge the knowledge gap that may exist when attempting to apply NMR methodologies to the field of food science. We begin by covering the basic principles required to apply NMR to the study of foods and nutrients. A description of the discipline of chemometrics is provided, as the combination of NMR with multivariate statistical analysis is a powerful approach for addressing modern challenges in food science. Furthermore, a comprehensive overview of recent and key applications in the areas of compositional analysis, food authentication, quality control, and human nutrition is provided. In addition to standard NMR techniques, more sophisticated NMR applications are also presented, although limitations, gaps, and potentials are discussed. We hope this review will help scientists gain some of the knowledge required to apply the powerful methodology of NMR to the rich and diverse field of food science.

Nuclear Magnetic Resonance (NMR) Spectroscopy in Food Science: A Comprehensive Review.

The multi-billion dollar dietary supplement industry is global in reach. The industry has been criticized for problems related to poor quality control, safety, misbranding, and adulteration. In this review, we describe how the US Food and Drug Administration (FDA) regulates dietary supplements within the framework of the Federal Food, Drug, and Cosmetic Act (FD&C Act). The Dietary Supplement Health and Education Act of 1994 (DSHEA), which amended the FD&C Act, gave the FDA the authority to promulgate Good Manufacturing Practices for dietary supplements and required that manufacturers provide the FDA information supporting a conclusion that the ingredients are reasonably expected to be safe if the dietary ingredients were not marketed in the USA before 15 October 1994. Recent amendments to the FD&C Act require that serious dietary-supplement-related adverse events be reported to the FDA and provide the agency with mandatory recall authority. We discuss the presence of naturally occurring (e.g. Ephedra, Citrus aurantium, Acacia) and synthetic (e.g. β-methylphenethylamines, methylsynephrine, α-ethyl-phenethylamine) biologically active phenethylamines (PEAs) in dietary supplements and of PEA drugs (e.g. clenbuterol, fenfluramine, sibutramine, lorcaserin) in weight-loss products. Regulatory actions against manufacturers of products labelled as dietary supplements that contain the aliphatic amines 1,3-dimethylamine and 1,3-dimethylbutylamine, and PEAs such as β-methylphenethylamine, aegeline, and Dendrobium illustrate the FDA's use of its authority under the FD&C Act to promote dietary supplement safety. Published 2016. This article is a U.S. Government work and is in the public domain in the USA.

Overview of regulation of dietary supplements in the USA and issues of adulteration with phenethylamines (PEAs).

Trifluoroacetic acid: Uses and recent applications in organic synthesis

Regioselective α,α-difunctionalization adjacent to a ketone is a significant synthetic challenge Here, we present a solution to this problem through the transition-metal-free coupling of esters with geminal bis(boron) compounds This forms an α,α-bis(enolate) equivalent which can be trapped with electrophiles including alkyl halides and fluorinating agents This presents an efficient, convergent synthetic strategy for the synthesis of unsymmetrical blocked ketones

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A Coupling Approach for the Generation of α,α-Bis(enolate) Equivalents: Regioselective Synthesis of gem-Difunctionalized Ketones.

Unprotected, primary 2-azidoamines are versatile precursors to vicinal diamines, which are among the most common motifs in biologically active compounds. Herein, we report their operationally simpl...

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Direct Synthesis of Unprotected 2-Azidoamines from Alkenes via an Iron-Catalyzed Difunctionalization Reaction.

Sulfonylureas is being used throughout the world for the treatment of diabetes mellitus. The aim of the present study was to investigate mode of action of tosylacrylimidamide. Tosylacrylimidamide a non-classical bioisosteres of sulfonyl urea, bioisosteres refer to structurally distinct molecules eliciting a similar biological effect. In the present study we have determined the ability of tosylacrylimidamide to stimulate insulin secretion from MIN-6 cells. The compounds were tested in the presence of 5 mM glucose concentration, our results indicates that compound 4 e, 4 f, 4 g were the most effective insulin secretagogue's amongst reported, then 4 e, 4 f, 4 g were further evaluated at various concentration of compound keeping glucose concentration constant (5 mM), resulting 4 e showed 4.34 fold increase in insulin secretion at 1 mg/ml of compound, 4 f showed 7.4 fold increase in insulin secretion at 5 mg/ml of compound and 4 g has shown 7.6 fold increase in insulin secretion at 5 mg/ml of compound. The rest of the tosylacrylimidamide in our assay had only marginal effects on insulin secretion 

Scrutiny of Novel Tosylacrylimidamide as Non‐Classical Bioisosteres of Sulfonylurea in Type II Diabetes Mellitus through Synthesis, In Vitro and Docking Studies

The present invention provides a process for the synthesis of olopatadine. Further, the invention discloses a process that results in improved yield of the desired Z isomer.

A process for the synthesis of olopatadine

Starting with the Sharpless dihydroxylation of the α,β-unsaturated ester (I) an asymmetric synthesis of the olefin (III) is developed, a known synthetic precursor of (+)-biotin.

A Novel and Enantioselective Synthesis of D-(+)-Biotin via a Sharpless Asymmetric Dihydroxylation Strategy.

A one-pot migration–formylation of benzyl aryl ethers under Duff reaction condition is described. The reaction was performed with HMTA (hexamethylene tetramine) and TFA (trifluoroacetic acid). Under the optimal reaction conditions, a variety of Bn and PMB ethers underwent ortho rearrangement.

Pradeep B. Lasonkar

Papers

Scrutiny of Novel Tosylacrylimidamide as Non‐Classical Bioisosteres of Sulfonylurea in Type II Diabetes Mellitus through Synthesis, In Vitro and Docking Studies

A process for the synthesis of olopatadine

A Novel and Enantioselective Synthesis of D-(+)-Biotin via a Sharpless Asymmetric Dihydroxylation Strategy.

One-Pot Migration—Formylation of Benzyl Aryl Ethers under Duff Reaction Condition.