Enzymatic catalysis has been pursued extensively in a wide range of important chemical processes for their unparalleled selectivity and mild reaction conditions. However, enzymes are usually costly and easy to inactivate in their free forms. Immobilization is the key to optimizing the in-service performance of an enzyme in industrial processes, particularly in the field of non-aqueous phase catalysis. Since the immobilization process for enzymes will inevitably result in some loss of activity, improving the activity retention of the immobilized enzyme is critical. To some extent, the performance of an immobilized enzyme is mainly governed by the supports used for immobilization, thus it is important to fully understand the properties of supporting materials and immobilization processes. In recent years, there has been growing concern in using polymeric materials as supports for their good mechanical and easily adjustable properties. Furthermore, a great many work has been done in order to improve the activity retention and stabilities of immobilized enzymes. Some introduce a spacer arm onto the support surface to improve the enzyme mobility. The support surface is also modified towards biocompatibility to reduce non-biospecific interactions between the enzyme and support. Besides, natural materials can be used directly as supporting materials owning to their inert and biocompatible properties. This review is focused on recent advances in using polymeric materials as hosts for lipase immobilization by two different methods, surface attachment and encapsulation. Polymeric materials of different forms, such as particles, membranes and nanofibers, are discussed in detail. The prospective applications of immobilized enzymes, especially the enzyme-immobilized membrane bioreactors (EMBR) are also discussed. [BMB reports 2011; 44(2): 87-95]

With the expansion of the security market, the demand of the anti-counterfeiting technology is becoming more and more big, and the requirement of the anti-counterfeiting technology is becoming more and more is also high. In this paper, a simple summary of the application of fluorescent material in the anti-counterfeiting field is finished. And analysis of the current situation and development tendency of fluorescent material at home and abroad is given in this paper.

Colorless fluorescent ink has certain anti-counterfeiting function. In this paper, fluorescence curve and spectral properties of the fluorescent ink with colors of fluorescent red, fluorescent blue and fluorescent green used for screen printing are tested. Besides, rheological properties of fluorescent inks such as viscosity and thixotropic behavior are shown in the paper.

Low price of wheat starch as a wide range of sources of edible film substrate, glycerol as a plasticizer, pullulan as a film-forming agent, prepared by solution casting of wheat starch-based edible green packaging materials. Tests were run on wheat starch-based edible films to determine mechanical properties, transparency and color evaluation. It was observed that the increase of the glycerol content in the wheat starch films increased the macromolecular mobility, the wheat starch films became less stiff and more flexible. Meanwhile the transparency and yellow index are both increased, obviously.

Application of anti-counterfeiting technology in the label has been widespread. This paper has studied the security label based on reflected light interference color, tells the story of its structure and preparation method, and application of glass beads in the label are detailed.