A method for chromatogenic acylation of a solid material carrying hydroxyl groups capable of reacting with fatty acid chlorides in the gaseous state, wherein a reactive fatty acid chloride composition is applied to the surface of the solid hydroxyl material by means of an applicator capable of releasing the composition on the surface of the material. The composition is applied to the surface of the solid hydroxyl material at an acylation temperature lower than the vaporization temperature of at least one fatty acid chloride of the composition to allow acylation of the material by reaction of at least one fatty acid chloride in the gaseous state of the composition with at least one of the hydroxyl groups of the material, the acylation temperature being between 160 C. and 250 C.

A method for chromatogenic acylation of a solid material carrying hydroxyl groups capable of reacting with fatty acid chlorides in the gaseous state, wherein a reactive fatty acid chloride composition is applied to the surface of the solid hydroxyl material by means of an applicator capable of releasing the composition on the surface of the material. The composition is applied to the surface of the solid hydroxyl material at an acylation temperature lower than the vaporization temperature of at least one fatty acid chloride of the composition to allow acylation of the material by reaction of at least one fatty acid chloride in the gaseous state of the composition with at least one of the hydroxyl groups of the material, the acylation temperature being between 160 C. and 250 C.

A method for preparing an ultraviolet (UV)-degradable and functionalized cellulose paper-based colorimetric sensor, in which a TiO.sub.2-loaded cellulose filter paper is prepared, from which a TiO.sub.2/OTS-loaded functionalized cellulose filter paper is prepared; and the TiO.sub.2/OTS-loaded functionalized cellulose filter paper is combined with colorimetric materials to obtain the UV-degradable and functionalized cellulose paper-based colorimetric sensor with multiple hydrophilic dye-loading regions and a hydrophobic isolation region. This application further provides a food quality evaluation method, in which a food quality evaluation model is established based on the UV-degradable and functionalized cellulose paper-based colorimetric sensor.

A method for preparing an ultraviolet (UV)-degradable and functionalized cellulose paper-based colorimetric sensor, in which a TiO.sub.2-loaded cellulose filter paper is prepared, from which a TiO.sub.2/OTS-loaded functionalized cellulose filter paper is prepared; and the TiO.sub.2/OTS-loaded functionalized cellulose filter paper is combined with colorimetric materials to obtain the UV-degradable and functionalized cellulose paper-based colorimetric sensor with multiple hydrophilic dye-loading regions and a hydrophobic isolation region. This application further provides a food quality evaluation method, in which a food quality evaluation model is established based on the UV-degradable and functionalized cellulose paper-based colorimetric sensor.