Formation of PLLA-PEG-PLLA Microparticles by Supercritical Antisolvent Process

Zhan, Shu‐Zhong; Cui, Liyun; Zhao, Qian; Wang, Jingchang; Chen, Shuhua; Ding, Shuiting

doi:10.1080/02726351.2013.804014

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…32,33 The two peaks located at 2949and 2866 cm −1 demonstrated C−H stretching vibration. 34,35 The absorption peaks of hydroxyl groups (−OH) at around 3500 cm −1 in PLLA, PCL, and PEG and that of the isocyanate group (−NCO) at 2270 cm −1 in HDI were hardly observed in the spectra of the PUs, 36 indicating that these functional groups have been massively consumed. In addition, PUs displayed great thermal stability (Figure 2C), suggesting that they could further undergo high-temperature sterilization for potential application in wound dressing.…”

Section: Resultsmentioning

confidence: 99%

A Biodegradable Janus Sponge for Negative Pressure Wound Therapy

Tang,

Guo,

Zhao

et al. 2024

Biomacromolecules

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Negative pressure wound therapy (NPWT) is effective in repairing serious skin injury. The dressing used in the NPWT is important for wound healing. In this paper, we develop biodegradable amphiphilic polyurethanes (PUs) and fabricate the PUs into sponges as wound dressings (Bi @e ) with Janus pore architectures for NPWT. The Bi @e is adaptive to all the stages of the wound healing process. The Janus Bi @e sponge consists of two layers: the dense hydrophobic upper layer with small pores provides protection and support during negative pressure drainage, and the loose hydrophilic lower layer with large pores absorbs large amounts of wound exudate and maintains a moist environment. Additionally, antibacterial agent silver sulfadiazine (SSD) is loaded into the sponge against Escherichia coli and Staphylococcus aureus with a concentration of 0.50 wt%. The Janus sponge exhibits a super absorbent capacity of 19.53 times its own water weight and remarkable resistance to compression. In a rat skin defect model, the Janus Bi @e sponge not only prevents the conglutination between regenerative skin and dressing but also accelerates wound healing compared to commercially available NPWT dressing. The Janus Bi @e sponge is a promising dressing for the NPWT.

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