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Related Concept Videos

Lewis Acids and Bases02:33

Lewis Acids and Bases

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In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
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Weak Base Solutions03:21

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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Base Excision Repair01:54

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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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DNA Base Pairing02:27

DNA Base Pairing

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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

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The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...
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Force-Clamp Rheometry for Characterizing Protein-based Hydrogels
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Semi-IPN- and IPN-Based Hydrogels.

Nicole Zoratto1, Pietro Matricardi2

  • 1Departement of Drug Chemistry and Technologies, Sapienza University of Roma, Roma, Italy.

Advances in Experimental Medicine and Biology
|May 9, 2018
PubMed
Summary

Semi-interpenetrating polymer networks (semi-IPNs) and interpenetrating polymeric networks (IPNs) offer tunable properties for biomedical uses by combining polymers. This review explores hydrogels made from polysaccharides and proteins, highlighting their potential in advanced pharmaceutical applications.

Keywords:
HydrogelsIPNPolysaccharidesProteinsSemi-IPN

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery

Background:

  • Semi-interpenetrating polymer networks (semi-IPNs) and interpenetrating polymeric networks (IPNs) are advanced materials for biomedical and pharmaceutical applications.
  • These networks combine properties of individual polymers, creating novel systems with unique characteristics.
  • Polysaccharides (e.g., alginate, hyaluronic acid, chitosan) and proteins (e.g., gelatin, collagen) are biocompatible building blocks for these networks.

Purpose of the Study:

  • To review the current state-of-the-art in semi-IPNs and IPNs for biomedical applications.
  • To highlight the potential of combining polysaccharides and proteins in designing advanced hydrogel materials.
  • To explore strategies for tailoring material properties for specific pharmaceutical and biomedical needs.

Main Methods:

  • Review of existing literature on polysaccharide- and protein-based semi-IPNs and IPNs.
  • Analysis of material properties resulting from the combination of different polymers.
  • Discussion of chemical derivatization possibilities for property tuning.

Main Results:

  • Semi-IPNs and IPNs offer versatile platforms for creating hydrogels with tailored properties.
  • The combination of biocompatible polysaccharides and proteins yields materials with enhanced performance for biomedical applications.
  • Functional groups on polymers allow for chemical modifications, expanding design possibilities.

Conclusions:

  • Semi-IPNs and IPNs, particularly those based on polysaccharides and proteins, represent a promising area for developing innovative biomedical and pharmaceutical materials.
  • Further research into designing these networks can lead to new strategies for drug delivery and tissue engineering.
  • The inherent biocompatibility and tunable nature of these materials underscore their potential for clinical translation.