6 results about "Cysteine" patented technology

The invention discloses a method of separating chiral drug penicillamine enantiomer based on a functional gold nanochannel. The method comprises the steps of by taking a polycarbonate (PC) film as a template, adopting a chemical deposition method to prepare a gold (Au) nanochannel film, and modifying L-cysteine (L-Cys) in the Au nanochannel by utilizing action of an Au-S bond to obtain the nanochannel with chiral site selectivity. The modifier L-cysteine has selective adsorption effect on D- penicillamine (D-Pen), but has repulsive action on L-penicillamine (L-Pen); in mixed liquor containing D-pen and L-Pen, the L-penicillamine can preferably passes through the nanochannel which is modified with the L- cysteine, so that complete separation of the penicillamine enantiomer is realized by utilizing the property. The method disclosed by the invention can be used for separating the penicillamine enantiomer, adopts a simple device, is simple to operate and easy to implement, and has better application prospect.

The invention relates to a microorganism and enzyme mixed preparation for stripping dirt of aquatic plants as well as a preparation method and application thereof. The microorganism and enzyme mixed preparation comprises citric acid, starch, carboxymethyl chitosan, bacillus subtilis, cellulase, cysteine and diatomite. The preparation method of the stripping agent comprises the following steps of: 1, sequentially adding the substances according to the proportion; 2, uniformly stirring for 15 minutes by using a V-shaped stirrer or a three-V stirrer; and 3, mixing the obtained mixture with pond water according to a mass ratio of 1: 100 to 1: 200, and uniformly stirring to obtain the microorganism and enzyme mixed preparation for stripping dirt of aquatic plants. Dirt on the surfaces of aquatic plants is rapidly removed, and photosynthesis is improved. A high-quality ecological environment rich in aquatic plants, which is clear in water, high in dissolved oxygen content in water and few in harmful substances in the water, is provided for cultured objects.

A composition for preventing or treating a metabolic disease, in particular phenylketonuria, comprising sulfur amino acids and minerals is provided, wherein said sulfur amino acids comprise a combination of methionine and cysteine in a methionine/cysteine ratio of 2.2-2.7:1 and said minerals comprise sodium, potassium, magnesium, calcium, chlorine, phosphorus. The composition of the invention is formulated to provide a negative PRAL value, preferably with −35<PRAL<−20 values mEq/day on 100 g of equivalent proteins.