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Polymers: Defining Molecular Weight01:01

Polymers: Defining Molecular Weight

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Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
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Psychology is the scientific discipline dedicated to understanding both observable behavior and the internal mental processes underlying such behavior. It aims to comprehend human nature and apply this understanding to solve practical problems, enhance well-being, and improve societal outcomes. An example of psychology's application is the study of prosocial behavior, such as why and under what conditions individuals might help strangers in need. This process involves describing observed...
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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Precisely Defined Polymers for Efficient Gene Delivery.

Dongsheng He1,2, Hao Lin3,4, Yinglan Yu3,4

  • 1Department of Pharmaceutics, Center for Research Development and Evaluation of Pharmaceutical Excipients and Generic Drugs, School of Pharmacy, China Pharmaceutical University, Nanjing, 210009, People's Republic of China. Dongshenghe@cpu.edu.cn.

Topics in Current Chemistry (Cham)
|January 17, 2018
PubMed
Summary
This summary is machine-generated.

Precisely defined polymers offer advantages over traditional polymers for gene therapy delivery. These advanced materials enable better modification, structure-activity studies, and consistent manufacturing for safer, more effective gene delivery carriers.

Keywords:
Defined polymersDendrimerGene deliveryPeptideSequence-defined oligoaminoamide

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Gene Therapy Delivery Systems

Background:

  • Efficient gene delivery carriers are essential for successful gene therapy.
  • Conventional polymeric materials face challenges in clinical translation due to heterogeneity and polydispersity.
  • These limitations impede precise modification, structure-activity relationship studies, and consistent manufacturing.

Purpose of the Study:

  • To review the design and development of precisely defined polymers for enhanced gene delivery.
  • To highlight the advantages of precisely defined polymers over conventional ones.
  • To discuss specific examples of precisely defined polymers used in gene delivery.

Main Methods:

  • Review of literature on precisely defined polymers for gene delivery.
  • Focus on polymers allowing site-specific optimization and controlled production.
  • Illustration with examples such as dendrimers, peptide-based polymers, and sequence-defined oligomers.

Main Results:

  • Precisely defined polymers overcome the limitations of heterogeneous polymers.
  • These materials facilitate structure-activity relationship studies and reproducible manufacturing.
  • Examples demonstrate their potential for efficient and safe nucleic acid delivery.

Conclusions:

  • Precisely defined polymers represent a promising advancement in gene delivery carrier technology.
  • Their controlled structure and production are key to overcoming clinical translation barriers.
  • Further development in this area is crucial for the advancement of gene therapy.