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Related Concept Videos

Radical Substitution: Allylic Chlorination01:31

Radical Substitution: Allylic Chlorination

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Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
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Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

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Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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Framing Effects03:26

Framing Effects

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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
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Versatile Chlorin e6-based magnetic polydopamine nanoparticles for effectively capturing and killing MRSA.

Chunbo Lu1, Feifei Sun1, Yinyin Liu1

  • 1College of Chemistry & Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology, Northwest A&F University, Yangling, 712100, Shaanxi, China.

Carbohydrate Polymers
|June 22, 2019
PubMed
Summary

A new magnetic material, chitosan (CS) functionalized magnetic Chlorin e6 (CS-MP-Ce6), effectively combats methicillin-resistant Staphylococcus aureus (MRSA) by capturing and destroying bacteria using near-infrared light. This offers a promising approach for treating resistant bacterial infections.

Keywords:
ChitosanChlorin e6MRSAPhotodynamic sterilization

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Infectious Diseases

Background:

  • Antibiotic resistance poses a significant global health threat, necessitating novel antibacterial strategies.
  • Developing effective treatments against resistant bacteria like methicillin-resistant Staphylococcus aureus (MRSA) is crucial.
  • Chitosan (CS) and Chlorin e6 (Ce6) are known for their biocompatibility and photodynamic properties, respectively.

Purpose of the Study:

  • To construct a multifunctional chitosan-functionalized magnetic Chlorin e6 (CS-MP-Ce6) material.
  • To evaluate the efficacy of CS-MP-Ce6 in combating methicillin-resistant Staphylococcus aureus (MRSA) infections.
  • To investigate the combined approach of bacterial conjugation, enrichment, and near-infrared (NIR)-triggered photodynamic sterilization.

Main Methods:

  • Synthesis of CS-MP-Ce6 nanoparticles.
  • In vitro assessment of bacterial capture and photodynamic sterilization against MRSA.
  • In vivo studies of MRSA-induced abscess treatment using CS-MP-Ce6 with magnetic targeting.

Main Results:

  • CS-MP-Ce6 demonstrated efficient capture of MRSA due to the positively charged chitosan.
  • In vitro studies showed excellent photodynamic sterilization of MRSA by CS-MP-Ce6 upon NIR irradiation.
  • In vivo abscess treatment studies indicated accelerated healing with CS-MP-Ce6 acting as localized nano-energy sources, concentrated by an external magnet.

Conclusions:

  • CS-MP-Ce6 is a promising multifunctional material for combating MRSA infections.
  • The integration of magnetic targeting and photodynamic therapy offers an effective strategy against antibiotic-resistant bacteria.
  • This framework provides a novel approach for developing advanced antibacterial systems.