Abstract: The invention discloses a coupled peptide chain for dissolving poorly soluble polypeptides and an application thereof for separation and purification in liquid chromatography, belonging to the field of biochemistry. A special linker arm is used to link a hydrophilic polypeptide chain with a poorly soluble polypeptide chain to solve the problem that the poorly soluble polypeptide chains cannot be operated in the liquid chromatography, and optimize the combination of hydrophilic amino acids, and then the poorly soluble polypeptide chain and hydrophilic polypeptide chain are broken by hydrolyzing an ester bond, so that the target peptide chain is directly precipitated, the method has the characteristics of simplicity and high efficiency, and the poorly soluble polypeptide product obtained by the method fully meets the standards required by customers.

Abstract: The present invention discloses a natural broad-spectrum preservative composition containing a citrus grandis fruit extract and its use. The composition mainly comprises a citrus grandis fruit extract, a hydroximic acid, an aromatic alcohol, and one or more polyols. The preservative composition uses a natural citrus grandis fruit extract as a main raw material, which is combined with a hydroxamic acid having a good inhibitory effect on fungi and an aromatic alcohol having a good inhibitory effect on bacteria dissolved in an improved functional solvent, has the characteristics of low irritation and high safety, and not only provides an excellent broad-spectrum bacteriostatic effect, but also improves the performance and values of the product due to the good oxidation resistance of the citrus grandis fruit extract.

Abstract: The invention discloses a coupled peptide chain for dissolving poorly soluble polypeptides and an application thereof for separation and purification in liquid chromatography, belonging to the field of biochemistry. A special linker arm is used to link a hydrophilic polypeptide chain with a poorly soluble polypeptide chain to solve the problem that the poorly soluble polypeptide chains cannot be operated in the liquid chromatography, and optimize the combination of hydrophilic amino acids, and then the poorly soluble polypeptide chain and hydrophilic polypeptide chain are broken by hydrolyzing an ester bond, so that the target peptide chain is directly precipitated, the method has the characteristics of simplicity and high efficiency, and the poorly soluble polypeptide product obtained by the method fully meets the standards required by customers.

Abstract: The present invention discloses a natural broad-spectrum preservative composition containing a citrus grandis fruit extract and its use. The composition mainly comprises a citrus grandis fruit extract, a hydroximic acid, an aromatic alcohol, and one or more polyols. The preservative composition uses a natural citrus grandis fruit extract as a main raw material, which is combined with a hydroxamic acid having a good inhibitory effect on fungi and an aromatic alcohol having a good inhibitory effect on bacteria dissolved in an improved functional solvent, has the characteristics of low irritation and high safety, and not only provides an excellent broad-spectrum bacteriostatic effect, but also improves the performance and values of the product due to the good oxidation resistance of the citrus grandis fruit extract.