Recent Advances in Cell Membrane-Derived Biomimetic Nanotechnology for Cancer Immunotherapy.

Immunotherapy will significantly impact the standard of care in cancer treatment. Recent advances in nanotechnology can improve the efficacy of cancer immunotherapy. However, concerns regarding efficiency of cancer nanomedicine, complex tumor microenvironment, patient heterogeneity, and systemic immunotoxicity drive interest in more novel approaches to be developed. For this purpose, biomimetic nanoparticles are developed to make innovative changes in the delivery and biodistribution of immunotherapeutics. Biomimetic nanoparticles have several advantages that can advance the clinical efficacy of cancer immunotherapy. Thus there is a greater push toward the utilization of biomimetic nanotechnology for developing effective cancer immunotherapeutics that demonstrate increased specificity and potency. The recent works and state-of-the-art strategies for anti-tumor immunotherapeutics are highlighted here, and particular emphasis has been given to the applications of cell-derived biomimetic nanotechnology for cancer immunotherapy.

Determination of spinosin and total saponins in compound Zaoshen tablet by HPLC and UV / 药学实践杂志

Objective To establish methods for the determination of spinosin and total saponins in compound Zaoshen tablet .Methods The separation of spinosin was performed on Agilent Zorbax SB C18 column (250 mm × 4 .6 mm ,5 μm) at 30℃ with water and acetonitrile as mobile phase for gradient elution at the flow rate of 1 .0 ml/min .The detection wavelength was 335 nm .Determination of total saponins was fulfilled by column chromatography followed by UV spectrometer with vanil-lin glacial acetic acid colorimetry .The detection wavelength was 560 nm .Results Linear range of spinosin was 20-100 μg/ml (r=0 .9990) and total saponins was 40-200 μg/ml (r=1 .0000) .The average recoveries for accuracy tests were 99 .55% and 99 .85% respectively .Conclusion Those methods are accurate and reliable .They can be used for the quality control of com-pound Zaoshen tablet .

Advances of erythrocyte-inspired delivery systems / 中国药科大学学报

@#In recent years, erythrocyte-inspired delivery systems have gained much attention. Erythrocytes(red blood cells, RBCs)are natural components of our bodies. Compared to the conventional drug delivery systems, RBCs have such advantages, as higher degree of biocompatibility and longer half-life. Herein, characteristics for drug delivery, preparation methods and recent research of RBC carriers are reviewed. Besides the latest development on RBC membrane-camouflaged nanoparticle systems(RBC-NP)and RBC membrane nanosponges, which have emerged as new trends of erythrocyte-inspired delivery systems are introduced.

Determination of the main phenolic in Clerodendranthus spicatus from different areas by colorimetric method / 国际药学研究杂志

Objective To choose an appropriate coloured system and develop a method for the determination of the main phenolic in Dai Medicine -Clerodendranthus spicatus from different areas. Methods The main phenolic in Clerodendranthus spicatus from 19 areas was determined at 500 nm wavelength, with rosmarinic acid as reference and sodium nitrite-aluminum nitrate-sodium hydroxide as colour-developing system. Results Rosmarinic acid presented good linear relationship (r2=0.9993) in the concentration range of 8.792-17.584μg/ml.The average recovery was 100.73%and RSD was 0.85%.The content of the main phenolic in Clerodendranthus spicatus ranged from 1.16 % to 3.49 %. Conclusion The method is appropriate for the determination of the main phenolic in Clerodendranthus spicatus. The main phenolic content in samples from Yunnan province is relatively high.

Preparation, characterization and Calu-3 cellular uptake of three kinds of poly(b-benzyl-L-amino)block-poly(ethylene glycol) nanoparticles / 药学学报

The aim of this paper is to compare the cytotoxicity and cellular uptake efficiency of three kinds of poly(b-benzyl-L-amino) block-poly(ethylene glycol) nanoparticles (PXA-PEG-NPs) using Calu-3 cells, and select one as a nasal drug delivery vector for curcumin (Cur). Poly(gamma-benzyl-L-glutamate) block-poly(ethylene glycol) nanoparticles (PBLG-PEG-NPs), poly(gamma-benzyl-L-lysine) block-poly(ethyleneglycol) nanoparticles (PZLL-PEG-NPs) and poly(gamma-benzyl-L-aspartate) block-poly(ethylene glycol) nanoparticles (PBLA-PEG-NPs) were prepared by emulsion-solvent evaporation method. MTT assays were used to evaluate the cytotoxicity of PXA-PEG-NPs against Calu-3 cells. The cellular uptake of nanoparticles was visualized by an inverted fluorescence microscope and quantified by a flow cytometer. The results indicated that even at high concentration of 2 mg x mL(-1) the three nanoparticles had no cytotoxicity on Calu-3 cells. Compared to the curcumin solution, the three curcumin-loaded PXA-PEG-NPs showed significantly higher cellular uptake efficiency on Calu-3 cells (at equal concentration of curcumin with 5 microg x mL(-1) Cur solution), PBLG-PEG-NPs group was the highest. The cellular uptake increased with incubation time, and has positive correlation with nanoparticle concentration. In brief, PXA-PEG-NPs are conducive to delivery Cur into cells, and PBLG-PEG-NPs might be provided as a good nasal drug delivery carrier.

Determination of salylic acid, syringic acid, benzoic acid and anthranilic acid in Radix Isatidis by HPCE / 中国中药杂志

<p><b>OBJECTIVE</b>To develop a simple and rapid capillary electrophoresis (CE) method for the separation and determination of four active organic acids including salicylic acid, syringic acid, benzoic acid, and anthranilic acid in Radix Isatidis.</p><p><b>METHOD</b>The HPCE system consisted of a fused-silica capillary column of 47.3 cm (38.3 cm to the detector) x50 microm i.d. and a mixture ofacetonitrile-borate buffer (15% acetonitrile, 25 mmol L(-1) borate, 15 mmol L(-1) beta-CD, pH 9.10) solution as the operating buffer. The applied voltage was 11.5 kV and the UV detection was set at 220 nm. The effects of the applied voltage, detection wavelength, and the pH of buffer, the concentration of buffer, acetonitrile and beta-CD were investigated.</p><p><b>RESULT</b>The linear calibration rang was 3.0-90 mg L(-1) (r=0.9994) for salylic acid, 4.0-120 mg L(-1) (r=0.9995) for syringic acid, 2.0-60 mg L(-1) (r=0.9998) for benzoic acid and 5.0-100 mg L(-1) (r=0.9992) for anthranilic acid. The recoveries of salylic acid, syringic acid, benzoic acid and anthranilic acid were 95.9%-102.6%, 98.6%-103.4%, 98.7%-104.1%, 96.1%-104.3% respectively. The detection limits of salylic acid, syringic acid, benzoic acid and anthranilic acid were 0.7, 1.1, 1.2 and 1.5 mg L(-1), respectively.</p>

Preparation and dissolution of solid dispersion of Fructus Schisandrae Chinensis extracts / 中草药

Objective To prepare Wurenchun solid dispersion of alcohol extracts of Fructus Schisandrae Chinensis so as to improve the dissolution of its active compound in vitro.Methods The Wurenchun solid dispersions were prepared with various carriers and drug/carrier ratios by mixing the carrier in alcohol extractive solution of FSC directly,and the apparent solubility and dissolution of deoxyschisandrin in them were tested and compared.Results The apparent solubility and dissolution of deoxyschisandrin of Wurenchun solid dispersion(extracts: polyvinylpyrrolidone(PVP) K30=1∶3) were increased remarkably to 5.06 ?g/mL and 43.2% in water individually,including dispersed and dissolved drug whose particle size is below 0.22 ?m,compared with that of the self-prepared Wurenchun capsules.Conclusion Wurenchun solid dispersion made of PVP K30 can remarkably enhance apparent solubility and dissolution of the active compound in vitro.

Fingerprint of Carthamus Tinctorius L. by HPLC / 中成药

AIM:To establish the chromatographic fingerprint of Carthamus Tinctorius L.by high performance liquid chromatography(HPLC).METHODS:The chromatographic fingerprint of Carthamus Tinctorius L.was established by HPLC with a RP-C_ 18 column,acetonitrile-water(0.5 phosphoric acid)gradient elution,a DAD diode array detector at 275 nm and the flow rate of 1.0 mL/min,column temperature of 25 ℃。 RESULTS:34 co-peaks of Carthamus Tiuctorius L.were gained from 10 producing provinces.Its basic features were rough consistent each other.Hydrosafflor yellow A,was selected as marker,among samples the content of Xinjiang was the highest in the all samples.CONCLUSION:This method provides useful information for identification of traditional Chinese medicines,the fingerprints of samples of Carthamus Tinctorius L.can be used to control the quality combined with content determination.

Extraction and seperation of indirubin in Folium Isatidis / 中成药

AIM: To study the suitable conditions of the extraction-separation process of the indirubin in Folium Isatidis with NIR. METHODS: The indirubin was chromatographed on an aluminium oxide column and chloroform-ethyl acetate as eluting agent,eluate was recrystalized by methanol-acetone. RESULTS: The indirubin extracted by this method was of high purity (97.78%).The sample purity was similar to reference substance one((98.01%)).The spectra of NMR and IR are the same. CONCLUSION: This method is proved to be fast,safe,lower cost,simple and has good results.