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Related Concept Videos

Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Membrane Lipids01:32

Membrane Lipids

Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
COP Coated Vesicles00:59

COP Coated Vesicles

Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of different...
Bioplastics01:27

Bioplastics

Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Related Experiment Video

Updated: Jun 29, 2026

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation
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Lotus-leaf-bioinspired biomass-based films for intelligent /active packaging.

Huie Jiang1, Peng Guo1, Haiyan Ju2

  • 1College of Bioresources Chemistry and Materials Engineering, National Demonstration, Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an 710021, PR China.

Food Chemistry
|November 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel, natural packaging material (L-GBC) that monitors food freshness and prevents spoilage. This microplastic-free innovation enhances food safety and reduces waste.

Keywords:
BiomimeticFood preservationGelatinHydrophobic filmpH response

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Area of Science:

  • Materials Science
  • Food Science
  • Biotechnology

Background:

  • Food packaging faces challenges like spoilage, waste, counterfeiting, and environmental pollution.
  • Traditional packaging materials often lack intelligent features and contribute to microplastic pollution.
  • Biodegradable, naturally-derived materials offer a sustainable alternative for advanced food packaging.

Purpose of the Study:

  • To develop an all-natural, biomass-based intelligent and active packaging material.
  • To integrate functionalities for visual freshness monitoring, anti-counterfeiting, and food preservation.
  • To overcome limitations of hydrophilic natural materials in packaging applications.

Main Methods:

  • Fabrication of a gelatin-bacterial cellulose-curcumin composite (L-GBC) with a lotus-leaf-inspired structure.
  • Incorporation of curcumin for pH sensitivity and fluorescence.
  • Evaluation of hydrophobicity, barrier properties, mechanical strength, antioxidant, UV-shielding, biodegradability, and antibacterial activity.
  • Application testing on pork freshness monitoring.

Main Results:

  • L-GBC exhibits enhanced hydrophobicity and water-vapor barrier properties.
  • The material demonstrates microplastic-free characteristics, good mechanical properties, antioxidant, UV-shielding, and antibacterial functions.
  • L-GBC successfully detects spoilage indicators (biogenic amines) via pH sensitivity and fluorescence.
  • Tested L-GBC extended pork freshness by two days compared to traditional PE film.

Conclusions:

  • L-GBC represents a significant advancement in intelligent and active food packaging.
  • This microplastic-free material offers comprehensive versatility for food safety and quality.
  • The lotus-leaf-inspired design overcomes previous limitations of natural packaging materials.