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→‎Commercial applications: updated with 1 item from 2022 in science (ultrasound imaging patch)
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* The ''Notaden'' frog glue is under development for [[Biomedical engineering|biomedical]] uses, e.g. as a [[surgery|surgical]] glue for [[orthopedic]] applications or as a [[hemostat]]<ref>Graham, L.D.; Glattauer, V.; Huson, M.G.; Maxwell, J.M.; Knott, R.B.; White, J.W.; Vaughan, P.R.; Peng, Y.; Tyler, M.J.; Werkmeister, J.A.; Ramshaw, J.A. (2005) Characterization of a protein-based adhesive elastomer secreted by the Australian frog ''Notaden bennetti''. ''Biomacromolecules'' 6, 3300-12. [http://pubs.acs.org/cgi-bin/abstract.cgi/bomaf6/2005/6/i06/abs/bm050335e.html Abstract]</ref>
* The ''Notaden'' frog glue is under development for [[Biomedical engineering|biomedical]] uses, e.g. as a [[surgery|surgical]] glue for [[orthopedic]] applications or as a [[hemostat]]<ref>Graham, L.D.; Glattauer, V.; Huson, M.G.; Maxwell, J.M.; Knott, R.B.; White, J.W.; Vaughan, P.R.; Peng, Y.; Tyler, M.J.; Werkmeister, J.A.; Ramshaw, J.A. (2005) Characterization of a protein-based adhesive elastomer secreted by the Australian frog ''Notaden bennetti''. ''Biomacromolecules'' 6, 3300-12. [http://pubs.acs.org/cgi-bin/abstract.cgi/bomaf6/2005/6/i06/abs/bm050335e.html Abstract]</ref>
* Mucosal [[drug delivery]] applications. For example, films of mussel adhesive protein give comparable mucoadhesion to [[polycarbophil]],<ref>Schnurrer, J.; Lehr, C.M. (1996) Mucoadhesive properties of the mussel adhesive protein. ''Int. J. Pharmaceutics'' 141 (1-2), 251-256</ref> a synthetic hydrogel used to achieve effective drug delivery at low drug doses. An increased residence time through adhesion to the mucosal surface, such as in the eye or the [[nasal administration|nose]] can lead to an improved absorption of the drug.{{citation needed|date=June 2014}}
* Mucosal [[drug delivery]] applications. For example, films of mussel adhesive protein give comparable mucoadhesion to [[polycarbophil]],<ref>Schnurrer, J.; Lehr, C.M. (1996) Mucoadhesive properties of the mussel adhesive protein. ''Int. J. Pharmaceutics'' 141 (1-2), 251-256</ref> a synthetic hydrogel used to achieve effective drug delivery at low drug doses. An increased residence time through adhesion to the mucosal surface, such as in the eye or the [[nasal administration|nose]] can lead to an improved absorption of the drug.{{citation needed|date=June 2014}}
* Long-time continuous [[Medical imaging#Ultrasound|imaging of diverse organs]] (via a [[wearable technology|wearable]] bioadhesive [[Stretchable electronics|stretchable]] high-resolution [[Medical ultrasound|ultrasound]] imaging patch, potentially enabling novel diagnostic and monitoring tools)<ref>{{cite journal |last1=Wang |first1=Chonghe |last2=Chen |first2=Xiaoyu |last3=Wang |first3=Liu |last4=Makihata |first4=Mitsutoshi |last5=Liu |first5=Hsiao-Chuan |last6=Zhou |first6=Tao |last7=Zhao |first7=Xuanhe |title=Bioadhesive ultrasound for long-term continuous imaging of diverse organs |journal=Science |date=29 July 2022 |volume=377 |issue=6605 |pages=517–523 |doi=10.1126/science.abo2542 |url=http://zhao.mit.edu/wp-content/uploads/2022/08/162.pdf |language=en |issn=0036-8075}}
* News article: {{cite news |title=This stick-on ultrasound patch could let you watch your own heart beat |url=https://www.sciencenews.org/article/ultrasound-patch-skin-watch-heart-beat-personalized-medicine |access-date=21 August 2022 |work=Science News |date=28 July 2022}}</ref>


Several commercial methods of production are being researched:
Several commercial methods of production are being researched:

Revision as of 16:07, 2 September 2022

Bioadhesives are natural polymeric materials that act as adhesives. The term is sometimes used more loosely to describe a glue formed synthetically from biological monomers such as sugars, or to mean a synthetic material designed to adhere to biological tissue.

Bioadhesives may consist of a variety of substances, but proteins and carbohydrates feature prominently. Proteins such as gelatin and carbohydrates such as starch have been used as general-purpose glues by man for many years, but typically their performance shortcomings have seen them replaced by synthetic alternatives. Highly effective adhesives found in the natural world are currently under investigation but not yet in widespread commercial use. For example, bioadhesives secreted by microbes and by marine molluscs and crustaceans are being researched with a view to biomimicry.[1]

Bioadhesives are of commercial interest because they tend to be biocompatible, i.e. useful for biomedical applications involving skin or other body tissue. Some work in wet environments and under water, while others can stick to low surface energy – non-polar surfaces like plastic. In recent years,[when?] the synthetic adhesives industry has been impacted by environmental concerns and health and safety issues relating to hazardous ingredients, volatile organic compound emissions, and difficulties in recycling or re mediating adhesives derived from petrochemical feedstocks. Rising oil prices may also stimulate commercial interest in biological alternatives to synthetic adhesives.

Examples of bioadhesives in nature

Organisms may secrete bioadhesives for use in attachment, construction and obstruction, as well as in predation and defense. Examples[2] include their use for:

Some bioadhesives are very strong. For example, adult barnacles achieve pull-off forces as high as 2 MPa (2 N/mm2). A similarly strong, rapidly adhering glue - which contains 171 different proteins and can adhere to wet, moist and impure surfaces - is produced by the very hard[4][5] limpet species Patella vulgata; this adhesive material is a very interesting subject of research in the development of surgical adhesives and several other applications.[6][7][8] Silk dope can also be used as a glue by arachnids and insects.

Polyphenolic proteins

The small family of proteins that are sometimes referred to as polyphenolic proteins are produced by some marine invertebrates like the blue mussel, Mytilus edulis[9] by some algae'[citation needed], and by the polychaete Phragmatopoma californica.[10] These proteins contain a high level of a post-translationally modified—oxidized—form of tyrosine, L-3,4-dihydroxyphenylalanine (levodopa, L-DOPA)[10] as well as the disulfide (oxidized) form of cysteine (cystine).[9] In the zebra mussel (Dreissena polymorpha), two such proteins, Dpfp-1 and Dpfp-2, localize in the juncture between byssus threads and adhesive plaque.[relevant?][11][relevant?] The presence of these proteins appear, generally, to contribute to stiffening of the materials functioning as bioadhesives.[12][citation needed] The presence of the dihydroxyphenylalanine-moiety arises from action of a tyrosine hydroxylase-type of enzyme;[citation needed] in vitro, it has been shown that the proteins can be cross-linked (polymerized) using a mushroom tyrosinase.[relevant?][13]

Temporary adhesion

Organisms such as limpets and sea stars use suction and mucus-like slimes to create Stefan adhesion, which makes pull-off much harder than lateral drag; this allows both attachment and mobility. Spores, embryos and juvenile forms may use temporary adhesives (often glycoproteins) to secure their initial attachment to surfaces favorable for colonization. Tacky and elastic secretions that act as pressure-sensitive adhesives, forming immediate attachments on contact, are preferable in the context of self-defense and predation. Molecular mechanisms include non-covalent interactions and polymer chain entanglement. Many biopolymers – proteins, carbohydrates, glycoproteins, and mucopolysaccharides – may be used to form hydrogels that contribute to temporary adhesion.

Permanent adhesion

Many permanent bioadhesives (e.g., the oothecal foam of the mantis) are generated by a "mix to activate" process that involves hardening via covalent cross-linking. On non-polar surfaces the adhesive mechanisms may include van der Waals forces, whereas on polar surfaces mechanisms such as hydrogen bonding and binding to (or forming bridges via) metal cations may allow higher sticking forces to be achieved.

L-DOPA is a tyrosine residue that bears an additional hydroxyl group. The twin hydroxyl groups in each side-chain compete well with water for binding to surfaces, form polar attachments via hydrogen bonds, and chelate the metals in mineral surfaces. The Fe(L-DOPA3) complex can itself account for much cross-linking and cohesion in mussel plaque,[15] but in addition the iron catalyses oxidation of the L-DOPA[16] to reactive quinone free radicals, which go on to form covalent bonds.[17]

Commercial applications

Shellac is an early example of a bioadhesive put to practical use. Additional examples now exist, with others in development:

Several commercial methods of production are being researched:

  • Direct chemical synthesis, e.g. incorporation of L-DOPA groups in synthetic polymers[23]
  • Fermentation of transgenic bacteria or yeasts that express bioadhesive protein genes
  • Farming of natural organisms (small and large) that secrete bioadhesive materials

Mucoadhesion

A more specific term than bioadhesion is mucoadhesion. Most mucosal surfaces such as in the gut or nose are covered by a layer of mucus. Adhesion of a matter to this layer is hence called mucoadhesion.[24] Mucoadhesive agents are usually polymers containing hydrogen bonding groups that can be used in wet formulations or in dry powders for drug delivery purposes. The mechanisms behind mucoadhesion have not yet been fully elucidated, but a generally accepted theory is that close contact must first be established between the mucoadhesive agent and the mucus, followed by interpenetration of the mucoadhesive polymer and the mucin and finishing with the formation of entanglements and chemical bonds between the macromolecules.[25] In the case of a dry polymer powder, the initial adhesion is most likely achieved by water movement from the mucosa into the formulation, which has also been shown to lead to dehydration and strengthening of the mucus layer. The subsequent formation of van der Waals, hydrogen and, in the case of a positively charged polymer, electrostatic bonds between the mucins and the hydrated polymer promotes prolonged adhesion.[citation needed][24]

See also

Mucilage

References

  1. ^ Smith, A.M. & Callow, J.A., eds. (2006) Biological Adhesives. Springer, Berlin. ISBN 978-3-540-31048-8
  2. ^ Graham, L.D. (2008) Biological adhesives from nature. In: Encyclopedia of Biomaterials and Biomedical Engineering, 2nd ed., Eds. Wnek, G. & Bowlin, G., Informa Healthcare, New York & London, vol. 1, p.236-253.
  3. ^ Li, D., Huson, M.G. & Graham, L.D. (2008) Proteinaceous adhesive secretions from insects, and in particular the egg attachment glue of Opodiphthera sp. moths. Arch. Insect Biochem. Physiol. 69, 85-105. DOI: 10.1002/arch.20267
  4. ^ Barber, Asa H.; Lu, Dun; Pugno, Nicola M. (2015). "Extreme strength observed in limpet teeth". Journal of the Royal Society Interface. 12 (105). doi:10.1098/rsif.2014.1326. PMID 25694539. S2CID 1507479.
  5. ^ Barber, Asa H.; Lu, Dun; Pugno, Nicola M. (2015). "Extreme strength observed in limpet teeth". Journal of the Royal Society Interface. 12 (105). doi:10.1098/rsif.2014.1326. PMC 4387522. PMID 25694539.
  6. ^ Kang, Victor; Lengerer, Birgit; Wattiez, Ruddy; Flammang, Patrick (2020). "Molecular insights into the powerful mucus-based adhesion of limpets ( Patella vulgata L.)". Open Biology. 10 (6): 200019. doi:10.1098/rsob.200019. PMC 7333891. PMID 32543352.
  7. ^ "Klebstoffe: Die Superhaftkraft der Napfschnecke".
  8. ^ Kang, V.; Lengerer, B.; Wattiez, R.; Flammang, P. (2020). "Molecular insights into the powerful mucus-based adhesion of limpets (Patella vulgata L.)". Open Biology. 10 (6): 200019. doi:10.1098/rsob.200019. PMC 7333891. PMID 32543352.
  9. ^ a b Rzepecki, Leszek M.; Hansen, Karolyn M.; Waite, J. Herbert (August 1992). "Characterization of a Cystine-Rich Polyphenolic Protein Family from the Blue Mussel Mytilus edulis L." Biological Bulletin. 183 (1): 123–137. doi:10.2307/1542413. JSTOR 1542413. PMID 29304577.
  10. ^ a b Jensen, Rebecca A.; Morse, Daniel E. (1988). "The bioadhesive of Phragmatopoma californica tubes: a silk-like cement containing L-DOPA". Journal of Comparative Physiology B. 158 (3): 317–24. doi:10.1007/BF00695330. S2CID 25457825.
  11. ^ Rzepecki, LM; Waite, JH (1993). "The byssus of the zebra mussel, Dreissena polymorpha. II: Structure and polymorphism of byssal polyphenolic protein families". Molecular Marine Biology and Biotechnology. 2 (5): 267–79. PMID 8180628.
  12. ^ Rzepecki, LM; Chin, SS; Waite, JH; Lavin, MF (1991). "Molecular diversity of marine glues: Polyphenolic proteins from five mussel species". Molecular Marine Biology and Biotechnology. 1 (1): 78–88. PMID 1845474.
  13. ^ Burzio, Luis A; Burzio, Veronica A; Pardo, Joel; Burzio, Luis O (2000). "In vitro polymerization of mussel polyphenolic proteins catalyzed by mushroom tyrosinase". Comparative Biochemistry and Physiology B. 126 (3): 383–9. doi:10.1016/S0305-0491(00)00188-7. PMID 11007180.
  14. ^ Leonard GH, Bertness MD, Yundo PO. Crab predation, waterborne cues, and inducible defenses in the blue mussel, Mytilus edulis. Ecology. 1999;80(1).
  15. ^ Sever M.J.; Weisser, J.T.; Monahan, J.; Srinivasan, S.; Wilker, J.J. (2004) Metal-mediated cross-linking in the generation of a marine-mussel adhesive. Angew. Chem. Int. Ed. 43 (4), 448-450
  16. ^ Monahan, J.; Wilker, J.J. (2004) Cross-linking the protein precursor of marine mussel adhesives: bulk measurements and reagents for curing. Langmuir 20 (9), 3724-3729
  17. ^ Deming, T.J. (1999) Mussel byssus and biomolecular materials. Curr. Opin. Chem. Biol. 3 (1), 100-105
  18. ^ Combie, J., Steel, A. and Sweitzer, R. (2004) Adhesive designed by nature (and tested at Redstone Arsenal). Clean Technologies and Environmental Policy 5 (4), 258-262. Abstract
  19. ^ USB flyer[permanent dead link]
  20. ^ Graham, L.D.; Glattauer, V.; Huson, M.G.; Maxwell, J.M.; Knott, R.B.; White, J.W.; Vaughan, P.R.; Peng, Y.; Tyler, M.J.; Werkmeister, J.A.; Ramshaw, J.A. (2005) Characterization of a protein-based adhesive elastomer secreted by the Australian frog Notaden bennetti. Biomacromolecules 6, 3300-12. Abstract
  21. ^ Schnurrer, J.; Lehr, C.M. (1996) Mucoadhesive properties of the mussel adhesive protein. Int. J. Pharmaceutics 141 (1-2), 251-256
  22. ^ Wang, Chonghe; Chen, Xiaoyu; Wang, Liu; Makihata, Mitsutoshi; Liu, Hsiao-Chuan; Zhou, Tao; Zhao, Xuanhe (29 July 2022). "Bioadhesive ultrasound for long-term continuous imaging of diverse organs" (PDF). Science. 377 (6605): 517–523. doi:10.1126/science.abo2542. ISSN 0036-8075.
  23. ^ Huang, K.; Lee, B.P.; Ingram, D.R.; Messersmith, P.B. (2002) Synthesis and characterization of self-assembling block copolymers containing bioadhesive end groups. Biomacromolecules 3 (2), 397-406
  24. ^ a b J.D. Smart. The basics and underlying mechanisms of mucoadhesion. Adv Drug Deliv Rev. 57:1556-1568 (2005)
  25. ^ Hägerström, Helene (2003). "Polymer Gels as Pharmaceutical Dosage Forms : Rheological Performance and Physicochemical Interactions at the Gel-Mucus Interface for Formulations Intended for Mucosal Drug Delivery". Diva.

External links

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