Application of Iron-phosphorus Nanomaterial in Promoting Preservation of Pepper

A method for improving contents of lignin, total phenols, flavonoids, and capsaicin in fruits, and activities of antioxidant enzymes, comprising using an iron-phosphorus nanomaterial for improving the contents of lignin, total phenols, flavonoids, and capsaicin in pepper fruits, and the activities of antioxidant enzymes through promoting phenylpropane metabolism and capsaicin metabolism pathway changes of fruits;

• wherein a method for preparing the iron-phosphorus nanomaterial comprises the following steps:
• respectively dissolving polyvinylpyrrolidone, a water-soluble trivalent iron salt, and a water-soluble phosphorus source in water to obtain a polyvinylpyrrolidone solution, an iron salt solution, and a phosphorus source solution;
• and
• mixing the polyvinylpyrrolidone solution with the phosphorus source solution, then, dropwise adding the iron salt solution while stirring, after dropwise addition, continuously stirring for reaction for a period of time, then performing centrifugation, collecting a precipitate, transferring the precipitate into a reaction vessel for heating reaction, after the reaction is completed, performing centrifugation, collecting solids, and performing washing and drying to obtain the iron-phosphorus nanomaterial.

A method for preservation by adjusting microorganism distribution in pepper fruits, comprising using an iron-phosphorus nanomaterial and increasing relative abundances of microorganisms related to decay in pepper fruits are decreased, and relative abundances of beneficial microorganisms;

• wherein a method for preparing the iron-phosphorus nanomaterial comprises the following steps:
• respectively dissolving polyvinylpyrrolidone, a water-soluble trivalent iron salt, and a water-soluble phosphorus source in water to obtain a polyvinylpyrrolidone solution, an iron salt solution, and a phosphorus source solution;
• and
• mixing the polyvinylpyrrolidone solution with the phosphorus source solution, then, dropwise adding the iron salt solution while stirring, after dropwise addition, continuously stirring for reaction for a period of time, then performing centrifugation, collecting a precipitate, transferring the precipitate into a reaction vessel for heating reaction, after the reaction is completed, performing centrifugation, collecting solids, and performing washing and drying to obtain the iron-phosphorus nanomaterial.