scholarly journals Polyvinylpyrrolidone microneedles for localized delivery of sinomenine hydrochloride: preparation, release behavior of in vitro & in vivo, and penetration mechanism

Drug Delivery ◽  
2020 ◽  
Vol 27 (1) ◽  
pp. 642-651
Author(s):  
Zixuan Shu ◽  
Yingji Cao ◽  
Yaotian Tao ◽  
Xiao Liang ◽  
Fangyuan Wang ◽  
...  
Keyword(s):  
Release Behavior ◽  
Penetration Mechanism ◽  
Localized Delivery ◽  
Sinomenine Hydrochloride

STUDY OF THE DIFFERENT RELEASE CHARACTERISTICS OF ANTIBIOTICS FROM PATIENTS: A DYNAMIC ELUTING SYSTEM TO INVESTIGATE DRUG RELEASE FROM ANTIBIOTIC-IMPREGNATED CALCIUM SULFATE DELIVERY

2015 ◽  
Vol 15 (01) ◽  
pp. 1550012
Author(s):  
YANG ZHANG ◽  
RENJIE WU ◽  
YING HU ◽  
YU DONG ◽  
LIFENG SHEN ◽  
...  
Keyword(s):  
Drug Release ◽  
Delivery System ◽  
Release Rate ◽  
Calcium Sulfate ◽  
Fickian Diffusion ◽  
Release Behavior ◽  
Cumulative Release ◽  
In Vivo Release

Background: Antibiotic-impregnated calcium sulfate delivery systems (ACDS) are commonly used to treat chronic osteomyelitis. Our research is to investigate drug release in vitro over a longer period, as a cautious predictor of in vivo release. Methods: The local release behavior of antibiotic in vitro was simulated. The consecutive dynamic eluting experiment was performed based on the pro-operative characteristic of osteomyelitis patients and the determined results of drug concentration in the human drainage tissue fluid (DTF). The concentration of each drug in the receiving solution was detected by ultra-performance liquid chromatography-tandem quadrupole detector mass spectrometry. The ACDS was reviewed by scanning electronic microscopy (SEM) after 48 h, and prepared to be eluted for another examination after 33 days. The mechanism of antibiotic release was analyzed by using the Ritger–Peppas and Weibull equations. Results: The cumulative release rate of vancomycin in a vancomycin-calcium sulfate delivery system (VCDS) was 77.50 % (3.0 mm diameter) and 72.43 % (4.8 mm diameter), while that of the tobramycin in a tobramycin-calcium sulfate delivery system (TCDS) was 88.0 % (3.0 mm diameter) and 84.55 % (4.8 mm diameter). At the 15th day, approximately 27.92% of vancomycin was and 29.35% of tobramycin was released from the local implant in vivo. Using SEM, numerous vancomycin and tobramycin particles were found to be attached to the columnar calcium sulfate crystals at the start of the experiment. The release behavior of the two antibiotics followed a combination of Fickian diffusion and Case II transport mechanisms within the first 48 h, and a Fickian diffusion mechanism during the subsequent time period. The correlation coefficient of tobramycin and vancomycin in vivo and in vitro was 0.9704–0.9949 and 0.9549–0.9782, respectively. Conclusion: A good correlation of the in vivo and in vitro cumulative release rates was observed by comparing the cumulative release rate of drugs in vitro by means of the dynamic eluting model, and in the DTF. Therefore, our study has proved that it is possible to use the dynamic eluting model as a cautious predictor of in vivo release.

Plasmonic CuS nanodisk assembly based composite nanocapsules for NIR-laser-driven synergistic chemo-photothermal cancer therapy

2018 ◽  
Vol 6 (7) ◽  
pp. 1035-1043 ◽  
Author(s):  
Jian He ◽  
Lisha Ai ◽  
Xin Liu ◽  
Hao Huang ◽  
Yuebin Li ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Drug Release ◽  
Cancer Cells ◽  
Therapeutic Effects ◽  
Release Behavior ◽  
Sustained Drug Release ◽  
Drug Release Behavior ◽  
Nir Laser

The NIR-laser-driven plasmonic photothermal and sustained drug release behavior of CuS–PTX/SiO2 nanocapsules show great synergistic chemo-photothermal therapeutic effects on cancer cells in vitro and in vivo.

scholarly journals Penetration mechanism of dimethyl sulfoxide in human and pig ear skin: An ATR–FTIR and near-FT Raman spectroscopicin vivoandin vitrostudy

2008 ◽  
Vol 22 (5) ◽  
pp. 405-417 ◽  
Author(s):  
Tanja M. Greve ◽  
Kristine B. Andersen ◽  
Ole F. Nielsen
Keyword(s):  
Dimethyl Sulfoxide ◽  
Conformational Changes ◽  
Bound Water ◽  
Free Water ◽  
Skin Barrier ◽  
Ft Raman Spectroscopy ◽  
Penetration Mechanism ◽  
Ft Raman

The penetration mechanism of dimethyl sulfoxide (DMSO) in human skinin vivoandin vitroand pig ear skin in vitro was studied using attenuated total reflectance (ATR) Fourier transform (FT) infrared (IR) and near-FT-Raman spectroscopy. The results showed changes in the conformation of the skin keratins from an α-helical to a β-sheet conformation. These changes were proved to depend on the concentration of free water in the sample as DMSO tended to bind to free water before the protein-bound water was replaced and the protein conformational changes were induced. The induced conformational changes were shown to be completely reversible as the proteins are returned to their original state within 20 h after the treatment with DMSO. The penetration depth of DMSO was shown to depend on the time of exposure – however, after only 15 min DMSO has penetrated thestratum corneum, which is the skin barrier.

scholarly journals Preparation, optimization and in vitro–in vivo evaluation of Shunxin sustained release granules

2019 ◽  
Vol 14 (1) ◽  
Author(s):  
Yinghuan Dou ◽  
Xuefeng Li ◽  
Yanbin Shi ◽  
Jiaying Zhang ◽  
Yang Yuan ◽  
...  
Keyword(s):  
Sustained Release ◽  
Chinese Patients ◽  
Release Behavior ◽  
Active Components ◽  
In Vivo Evaluation ◽  
In Vitro Drug Release ◽  
Drug Release Behavior ◽  
Optimal Formula

Abstract Background Shunxinzufang decoction is tutors, empirical formula and has been used in Chinese patients of HFpEF for several years. The aim of this study was to make into sustained release granules and select the best formula for the preparation of Shunxin sustained release granules and to evaluate its in vivo and in vitro drug release behavior. Methods Response surface methodology and Center composite design were applied to screen the optimal formula of Shunxin sustained release granules. HPLC was used to detect indicative ingredients—paeoniflorin, calycosin-7-glucoside and ferulic acid in Shunxin sustained release granules. The in vitro sustained release character of indicative ingredients was investigated in simulated digestive fluids. In-vivo process of active components was studied through pharmacokinetics. Results The optimal formula of Shunxin sustained release granules consisted of 35% shunxinzufang extract and 65% HPMC/starch (HPMC/starch ratio = 2:1). Three indicative components can be separated well under selected HPLC conditions. Compared with Shunxinzufang extract, the active components of Shunxin sustained release granules have obvious sustained-release character and improved bioavailability. Conclusion Shunxin sustained release granules has obvious sustained-release character and improved bioavailability.

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