Which of the following is not a matrix used for entrapment?*a) Agarb) Collagenc) Glutaraldehyded) Diatomaceous earth

To determine which option is not a matrix used for entrapment, we need to briefly evaluate each option based on their common uses, particularly in biological or chemical applications.

1. Agar: This is a gelatinous substance derived from seaweed, commonly used in microbiological culture media. It's often used as a matrix for entrapment of cells.

2. Collagen: This is a protein that provides structure to various tissues in the body. Collagen gels are often used as matrices for cell culture and scaffoldings in tissue engineering, making it a suitable entrapment matrix.

3. Glutaraldehyde: This is a chemical commonly used as a fixative in biological studies and for cross-linking proteins. However, it is not a matrix in itself but rather a reagent. While it can be involved in processes that involve entrapment, it does not function as a physical matrix like the others.

4. Diatomaceous Earth: This is comprised of fossilized remains of diatoms. It can be utilized in various filtering and separation applications, making it a viable option for entrapment.

Conclusion

Given the analysis, the option that is not a matrix used for entrapment is c) Glutaraldehyde.