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Related Concept Videos

Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Conjugated Proteins02:50

Conjugated Proteins

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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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What is the Immune System?01:38

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Overview
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Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
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Related Experiment Video

Updated: Feb 13, 2026

Investigating the Alleviating Effects of Bacillus cereus Administration on Colitis through Gut Microbiota Modulation
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CpG-PEG Conjugates and their Immune Modulating Effects after Systemic Administration.

Caixing Wu1, Xiaofei Xiang2, Yang Yue2

  • 1Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou, China.

Pharmaceutical Research
|March 4, 2018
PubMed
Summary
This summary is machine-generated.

Polyethylene-glycol (PEG) conjugated CpG oligodeoxynucleotides (ODNs) show improved circulation persistence and immune modulation for cancer therapy. These CpG-PEGs enhance anti-tumor immunity by increasing IL-12p70 and reducing myeloid-derived suppressor cells in tumors.

Keywords:
CpG-ODNPEGimmune modulationsystemic administation

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Area of Science:

  • Immunology
  • Nanotechnology
  • Oncology

Background:

  • Synthetic oligodeoxynucleotides (ODNs) with unmethylated CpG motifs activate Toll-like receptor 9 (TLR9) to modulate immune responses.
  • In vivo applications of CpG ODNs in cancer immunotherapy have faced limitations.
  • Polyethylene-glycol (PEG) conjugation is explored to enhance ODN stability and efficacy.

Purpose of the Study:

  • To synthesize and evaluate polyethylene-glycol (PEG) conjugated CpG ODNs (CpG-PEGs) for cancer immunotherapy.
  • To investigate the immune modulation mechanisms of CpG-PEGs in anti-cancer therapy.
  • To compare the in vivo pharmacokinetics and pharmacodynamics of CpG-PEGs versus non-PEGylated CpG ODNs.

Main Methods:

  • Synthesis of CpG-PEG conjugates with varying PEG lengths.
  • In vitro assessment of CpG-PEG activity.
  • Evaluation of in vivo pharmacokinetics (PK) and pharmacodynamics (PD) properties.

Main Results:

  • CpG-PEG20K demonstrated prolonged circulation time and activation of diverse effector cells.
  • Intravenous administration of CpG-PEG20K led to elevated IL-12p70 levels and reduced myeloid-derived suppressor cell (MDSC) infiltration in tumors.
  • CpG-PEGs exhibited distinct systemic and local PK-PD profiles compared to non-PEGylated CpG ODNs.

Conclusions:

  • CpG-PEGs represent a promising therapeutic agent for systemic administration in cancer immunotherapy.
  • CpG-PEGs effectively modulate immune responses and the tumor microenvironment.
  • Further development of CpG-PEGs supports their potential as a novel anti-cancer therapeutic strategy.