Low-field NMR devices utilize low-field nuclear magnetic resonance technology (LF-NMR) and achieve precise measurement of rapeseed oil content through specific hardware configurations and software algorithms.

As the world’s largest food consumption market, China faces severe challenges in protein and oil supply. Data show that the annual domestic shortfall of animal protein exceeds 10 million tons, while dependence on imported edible oil reaches 70%. Under traditional agricultural models, animal protein production relies on grain conversion, consuming vast resources (for example, producing 1 kg of beef requires 8 kg of feed) and causing significant environmental pollution. Plant protein, on the other hand, is constrained by limited land resources and low processing efficiency. Against this backdrop, adopting a “holistic food perspective” and conducting in-depth research on exploring and creating new food resources has become a strategic choice to ensure national food security.

Flaxseed oil, one of the fastest-growing edible oils in recent years, is a natural oil extracted from flax seeds. It is particularly rich in unsaturated fatty acids and various other nutrients, making it highly valued in the edible oil market.

In the food industry, the formation of lipid crystal networks involves two stages. The first stage occurs on the production line, where rapid cooling and kneading induce quick crystallization of lipids, producing fine and stable crystals that are then matured to obtain structurally stable crystalline products. The second stage involves changes in the crystallization behavior of these matured lipid products during storage and transportation. This latter stage essentially covers the period from when the lipid products leave the manufacturing plant until they are used by the end consumer.

In nature, oil and water are the two substances with the highest hydrogen proton content. Since nuclear magnetic resonance (NMR) signals primarily originate from hydrogen, a higher number of hydrogen protons indicates higher oil or water content, and vice versa. Therefore, by calibrating signal intensity, NMR can be used to measure the oil and water content of a substance.

A benchtop NMR (nuclear magnetic resonance) system can be used to measure the oil content in tea seeds. Since the NMR signal intensity is directly proportional to the mass of oil, the oil content in tea seeds can be accurately determined through oil content calibration.

Jatropha curcas, also known as xiaotongzi, false tung tree, hedge castor, and wild peanut, is a bioenergy tree species.

With the rapid development of society, food safety has become an increasing concern for the public. As an essential daily commodity, the quality of edible oils directly affects human health.

Crude Oil: Refers to the primary oil obtained from animal or plant oilseeds through pressing or solvent extraction processes, without undergoing refining. Crude oil contains a large amount of impurities, moisture, gums, and other substances that can affect its quality and significantly shorten its shelf life. Refining: The process by which crude oil is transformed into edible oil through a series of steps, including dehydration, de-soaping, degumming, desolventizing, impurity removal, deodorization, and decolorization.

Determination of Seed Oil Content by Nuclear Magnetic Resonance (NMR)