Objective:To study the kinetics of transdermal absorption of volatile oil from Angelica slinesis in fetal skin and investi-gate the mechanism of penetration enhancement in terms of morphology. Methods: Franz diffusion cells were used to investigate the transdermal characteristics in vitro. The content of ligustilide was determined by HPLC, and the cumulative permeation amount per unit area and rate constant of ligustilide were calculated. The effects of volatile oil from Angelica slinesis on skin ultrastructure was observed by a scanning electron microscope and a transmission electron microscope. Results:The kinetics of volatile oil at different concentra-tions was all in accordance with Higuchi equations. The ultrastucture changes of fetal skin under the scanning electron microscope were as follows:the wrinkles on skin surface increased, some areas of stratum corneum peeled off and turnovered like worn-out cotton pad-ding, the follicular orifice was enlarged, and the cuticles of the hair shaft dropped off and became thinner. The changes of fetal skin ul-trastucture under the transmission electron microscope were as follows:stratum corneum cells peeled off, the cell junction in basal lam-ina and stratum spinosum were broken, and the intercellular space was enlarged. Conclusion: The volatile oil from Angelica slinesis has good transdermal permeability. Its enhancement mechanism of transdermal drug absorption is closely related with the effects on skin ultrastructure, which can change the structure of stratum corneum to increase the cell gaps resulting in enhancing drug penetration.

Objective:To observe the changes of lactate clearance rate (LCR) and serum polyligandosan-1 (SDC-1) in patients with septic shock complicated with acute respiratory distress syndrome (ARDS) and to evaluate its prognostic value.Methods:Patients with septic shock and ARDS who were admitted to the Respiratory Intensive Care Unit (RICU) of Zhengzhou Central Hospital Affiliated to Zhengzhou University from February 2021 to April 2022 were selected as subjects. The patients were divided into the survival group and death group according to their 28-day survival status. General clinical data and related indicators of patients in the two groups were collected and compared. The related factors influencing the 28-day death of patients with septic shock and ARDS were screened, and receiver operating characteristic (ROC) curve was drawn to evaluate the individual and combined forecast value of LCR and SDC-1 for the prognosis of patients with septic shock and ARDS.Results:Compared with the survival group, sequential organ failure score (SOFA) and acute physiology and chronic health status score Ⅱ(APACHE Ⅱ) at admission to RICU, the levels of 24 h Lac, 6 h SDC-1, 24 h SDC-1 and 72 h SDC-1 in the death group increased significantly (all P< 0.05), and the levels of 6 h LCR, 24 h LCR, 6 h OI, 24 h OI and 72 h OI significantly decreased (all P<0.05). Spearman correlation analysis showed that SDC-1 at 6 h, 24 h and 72 h was significantly negatively correlated with OI at corresponding time points (all P<0.05), and LCR at 6 h and 24 h was significantly positively correlated with OI at corresponding time points (all P<0.05). Multivariate Logistic regression analysis showed that SOFA score, 24 h LCR, 24 h SDC-1 and 72 h SDC-1 were the risk factors of 28-d death in patients with septic shock and ARDS (all P<0.05). The areas under ROC curve of each related factor were SOFA score, 24 h LCR, 24 h SDC-1 and 72 h SDC-1, which could predict the prognosis (all P<0.05). 24 h LCR combined with 24 h SDC-1 had the maximum area under the curve (AUC=0.805, 95% CI: 0.691-0.920, with a sensitivity of 75.0% and a specificity of 74.4%). Conclusions:24 h LCR, 24 h SDC-1 and 72 h SDC-1 are the risk factors of the 28-day death of patients with septic shock and ARDS. 24 h LCR combined with 24 h SDC-1 can improve the test efficiency compared with the single indicator.

Objective To study the absorption characteristics of promethazine hydrochloride in different parts of rat intestine, provide evidence for the development of new preparation. Methods Rat single-pass intestinal perfusion model was established. By using high performance liquid chromatography (HPLC), 25, 50, 100 μgmL-1 promethazine hydrochloride concentration changing in different parts of the intestine was detected. Through the relevant calculation, the absorption rate constant ( Ka ) , and the apparent absorption coefficient ( Papp ) were obtained. Results With the concentration increase of promethazine hydrochloride in duodenal and ileal segments, the Ka and Papp increased significantly in the same part. Ka was (28.00±0.02)×10-2min-1 and Papp was (9.64±0.22) in the jejunum were the highest when the promethazine hydrochloride concentration was 50 μgmL-1 . As the concentration increased in colon, there were no significant changes in Ka and Papp . Conclusion Promethazine hydrochloride is absorbed in various intestinal segments, most obviously in duodenum and ileum, the absorption order is duodenum>ileum>jejunum>colon. Promethazine hydrochloride is absorbed most in the small intestine, in line with the intestinal absorption characteristics.