Method for quickly screening existence of melamine urea formaldehyde resin in feed

Abstract

The invention discloses a method for quickly screening the existence of melamine urea formaldehyde (MUF) resin in a feed. The method comprises the following steps: firstly, weighing a feed sample and placing the feed sample into a plastic centrifuge tube with a stopper, adding tetrahydrofuran-water solution into the plastic centrifuge tube, oscillating the plastic centrifuge tube in a whirling manner, adding methanol for ultrasonic extraction, centrifuging, filtering the supernatant fluid to another plastic centrifuge tube with a stopper, adding methanol into the first plastic centrifuge tube for repeated extraction one more time, merging the supernatant fluid, blowing and concentrating the supernatant fluid to be nearly dry, conducting constant-volume filtering through methanol-water, then adopting a capillary cataphoresis-DAD (photo-diode-detector) for detection, and determining that the MUF resin exists in the feed if a characteristic absorption peak exists at the detection wavelength of 224nm. The method quickly screening the existence of melamine urea formaldehyde (MUF) resin in the feed, provided by the invention, plays a supervision role on the quality safety of dairy food.

Description

technical field [0001] The invention relates to a method for quickly screening whether there is melamine urea formaldehyde resin in feed, and belongs to the technical field of detection. Background technique [0002] Melamine urea-formaldehyde resin (MUF) is a modified resin obtained by adding melamine on the basis of urea-formaldehyde resin, also known as melamine-modified urea-formaldehyde resin. Due to the high cost of melamine formaldehyde resin (MF) and the poor water resistance of urea formaldehyde resin (UF), melamine urea formaldehyde resin (MUF) is cost-effective and has good water resistance. At present, most wood processing enterprises have adopted melamine urea formaldehyde resin. as an adhesive. Although most wood processing enterprises use melamine urea formaldehyde resin as an adhesive, there is a lack of understanding of its bonding mechanism, quality testing, and correct use. Feed binder, also known as excipient, is mainly used to process pellet feed, whic...

AI Technical Summary

Problems solved by technology

And because of its high nitrogen content, it may be added to animal feed by unscrupulous traders, used as a feed binder or as a protein

Melamine urea formaldehyde resin not only has no nutritional value, it is even harmful to animals, and it can even cause the death of animals in severe cases

Melamine urea formaldehyde resin plays an important role in the process of feed production, packaging and acting as "pseudoprotein". Currently, there is a lack of matching testing standards, and regulators lack effective means in the supervision and management of dairy product quality and safety. Therefore, the establishment The detection method of melamine urea formaldehyde resin in feed is imperative

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