A quantitation method of ethanolamine phosphate capable of measuring trace amounts of ethanolamine phosphate, or oxidoreductase used for the quantitation method thereof, a quantitation composition, a quantitation kit, a sensor chip, or a sensor is provided. According to an embodiment of the present invention, a quantitation method of ethanolamine phosphate including allowing phosphatase to act on a sample to convert ethanolamine phosphate contained in the sample into ethanolamine, and allowing oxidoreductase to act on the ethanolamine is provided.

Provided herein, among other things, is an engineered non-plant cell that produces a tropane alkaloid product, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product. A method for producing a tropane alkaloid, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product that makes use of the cell is also described.

There is provided a novel quantification method for quantifying a concentration of EAP, which is a biomarker of depression, an enzyme for quantitation, a composition for quantitation, a kit for quantitation or a sensor for quantitation. There is provided a quantification method of ethanolamine phosphate by adding oxidoreductase to a sample containing ethanolamine phosphate. A mediator may be reduced by adding the oxidoreductase, and the reduced mediator may be reacted with a reagent to determine a concentration of ethanolamine phosphate. In addition, hydrogen peroxide produced by adding the oxidase as the oxidoreductase may be reacted with a reagent to determine a concentration of the ethanolamine phosphate.

Provided herein, among other things, is an engineered non-plant cell that produces a tropane alkaloid product, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product. A method for producing a tropane alkaloid, a precursor of a tropane alkaloid product, or a derivative of a tropane alkaloid product that makes use of the cell is also described.

The present application relates to a collagen hydrogel, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: (1) by using an amine oxidase, catalyzing collagen to undergo oxidative deamination to generate unsaturated aldehyde functional groups, and performing intramolecular or intermolecular crosslinking, so as to complete primary crosslinking; and (2) subjecting the primary cross-linked product to secondary crosslinking under the catalysis of a carboxyl activator so as to obtain the collagen hydrogel. In the present application, the collagen hydrogel prepared by the method is a pure collagen hydrogel, and has a high curing speed, good biocompatibility (excellent bionic properties), adjustable mechanical strength, adjustable structural size, good stability, and a wide range of application.