ELISA technique was used to detect Gnathostoma spinigerum in human. Antigene sample was prepared from G.spinigerum. 9 cases were determined as G.spinigerum infection. Antibody titres were found to range from 1/400 to 1/3.200. Results showed the efficacy of ELISA technique in the diagnosis of Gnathostoma infection
Freeze Drying ; standards

Superferon lyophylized with a content of 3.106 IU/bottle was prepared in semi-industrial scale. Nine consecutive lots have been produced meeting WHO and national standard. Antivirus activity, cytotoxic effect as well as fever induced effect on rabbit, residual moisture were verified
Preventive Medicine ; Freeze Drying

Human untreated costal cartilage was compared with lyophilized human costal cartilage which was treated with defatting solution for 48 hours and freeze drying for 72 hours (-70degree C, 10??bar) on the tendency of distortion. All cartilages, which were taken from six cadavers, were carved 5x5x30mm in size on principle of the balanced cross section. Their distortions were evaluated by two methods at intervals of one week, one month, three months, six months after experiment. At first, the degree of distortion was grossly graded with four steps: grade O; no distortion / grade I; minimal distortion / grade II; moderate distortion / grade III; severe distortion. Second method is measurement and quantification of distortion in the horizontal and vertical plane of cartilage.Untreated cartilage is shown to be an unsatisfactory material, with only three(12%) of the 25 cartilages being cosmetically acceptable(grade 0 and 1) after 6 months. In lyophilized cartilage, 18(94%) of the 19 cartilages were cosmetically acceptable(grade 0 and 1) at 6 months. This figure is highly significant(p<0.01). In another method, distortion in the horizontal(h) and vertical (v) planes of cartilage were measured, and mean values of ???? were calculated. In untreated group, the mean values of ???? were 0.82 at 1 week, 0.91 at 1 month, 1.13 at 3 months, and 1.31 at 6 months. In lyophilized group, the mean values were 0.27 at 1 week, 0.29 at 1 month, 0.40 at 3 months and 0.47 at 6 months. All values were statistically significant(p<0.01).
Cadaver ; Cartilage* ; Freeze Drying ; Humans

The objective of the present study was designed to evaluate lyophilized red blood cells of the ultrastructure. Blood was drawn from healthy adult. In group 1, sample was fresh blood; in group 2, sample was added 35% glycerine, stored at -80 degrees C for 24 hours; in group 3, red blood cells stored at 4 degrees C for 5 hours, then were lyophilized for 16 hour. The sample was resuspended for measurements of count and electron microscopy study. The result showed that lyophilized red blood cells possessed relative integrated structure, red blood cell recovery was 53%. The mean diameter, optical density and integral optical density of red blood cell were 4.7 +/- 0.4, 0.14 +/- 0.03 and 1.58 +/- 0.46 in group 1; 4.6 +/- 0.7, 0.14 +/- 0.02 and 2.35 +/- 0.64 in group 2; 4.4 +/- 0.4, 0.17 +/- 0.05 and 2.35 +/- 0.46 in group 3, respectively. There was no significant difference in lyophilized and frozen group, but there was significant difference in lyophilized group and normal group. In conclusion, human red blood cells could be successfully lyophilized and possess relative integrated structure. The mean diameter, optical density and integral optical density of lyophilized red blood cells were similar to that of cryopreservation red cells.
Blood Preservation ; Erythrocytes ; ultrastructure ; Freeze Drying ; Humans

OBJECTIVETo determine the total content of 10 ginsenosides in Yiqifumai lyophilized injection by near infrared spectroscopy.

METHODSixty samples were collected and determined of the total contents of ten ginsenosides by HPLC. The optimal calibration model was established by the contents of 10 ginsenosides in fifty samples and their NIR spectroscopy using the PLS. And the contents of 10 samples were successfully predicted.

RESULTWhen using the pretreatment of the first derivative and MSC in the range of 4 246.8 - 4 602.2, 5 446.8 - 61 02.6 cm(-1), the best dimension was 9, and the quantitative model was accurate. The R2 was 94.2, and the RMSECV was 0.186. The RMSEP of ten samples was 0.234.

CONCLUSIONThis method is easy, rapaid and precise, and can be used to determine the content of 10 ginsenosides in Yiqifumai lyophilized injection.

Bioactive glass (BG) has been widely used in the preparation of artificial bone scaffolds due to its excellent biological properties and non-cytotoxicity, which can promote bone and soft tissue regeneration. However, due to the brittleness, poor mechanical strength, easy agglomeration and uncontrollable structure of glass material, its application in various fields is limited. In this regard, most current researches mainly focus on mixing BG with organic or inorganic materials by freeze-drying method, sol-gel method, etc., to improve its mechanical properties and brittleness, so as to increase its clinical application and expand its application field. This review introduces the combination of BG with natural organic materials, metallic materials and non-metallic materials, and demonstrates the latest technology and future prospects of BG composite materials through the development of scaffolds, injectable fillers, membranes, hydrogels and coatings. The previous studies show that the addition of BG improves the mechanical properties, biological activity and regeneration potential of the composites, and broadens the application of BG in the field of bone tissue engineering. By reviewing the recent BG researches on bone regeneration, the research potential of new materials is demonstrated, in order to provide a reference for future related research.
Bone Regeneration ; Bone and Bones ; Freeze Drying ; Glass ; Hydrogels

To study effect of pre-freezing temperature and lyophilizer shelf temperature on recovery of human red blood cells after lyophilization and determine solidifying temperature of this lyophilization system, the protective solution composed of 7% DMSO, 40% polyvinylpyrrolidone (PVP) and isotonic buffer were adopted to lyophilize red blood cells at different pre-freezing temperatures or shelf temperatures. At first, fresh whole blood was centrifugated, washed and equilibrized to prepare concentrated red blood cells. Then concentrated red blood cells were mixed with the protective solution at 1:3 and pre-freezed at different temperature (-20, -35, -45, -80 or -196 degrees C) before lyophilization in lyophilizer. To study effect of shelf temperature on lyophilization of red blood cells, red blood cells were lyophilized at different shelf temperature after pre-freeze at -80 degrees C. After lyophilization, the samples were quickly rehydrated by 37 degrees C rehydration solution. The results showed the recovery rate of red blood cells and hemoglobin after pre-freeze at different temperature and lyophilization were > 85% and > 75%, there was not significant difference among these groups, but the concentration of free hemoglobin in -196 degrees C group was significantly higher than that in other groups (P < 0.01). With decreasing of shelf temperature, the lyophilizing time was also prolonged. When shelf temperature was > or = -25 degrees C, samples were not fully lyophilized; when shelf temperature was < or = -30 degrees C, the recovery rate of red blood cells and hemoglobin after lyophilization and rehydration were above 90%; after washed to isotonic state, the recovery rate of hemoglobin of the four groups was similar to each other. In conclusion, only when pre-freezing temperature is between -20 and -80 degrees C and the lyophilizer shelf temperature is < or = -30 degrees C, the effect of lyophilization is better, but the effect of excessively low pre-freezing temperature may even be worse.
Blood Preservation ; Erythrocytes ; cytology ; Freeze Drying ; Hemoglobins ; analysis ; Humans ; Temperature

Pig aortic vessels were processed by vacuum freeze-drying and then the aotic vessels were scanned and compared by CT, microscopic and texture analyzer. These processes presented a new method for preserving the vessels. Morphological changes of the vessels were tracked by Micro-CT, and mechanical properties were compared by texture analyzer combining with microscopic observation for structures and tissues. Results showed that the wall of the vessels became thinner by freeze-drying. After rehydration, the membrane structure was generally maintained, and the elastic fibers were more orderly arranged so that they were close to fresh vessels. In the area of mechanical property, the maximum puncture stress and axial tensile stress of rehydrated blood vessels were stronger than that of the fresh, while circumferential tensile stress was weaker than that of the fresh. Finally, analysis also showed that the freeze-dried vessel was basically remained the original morphological structure. The pores in vessel fiber and stratification during drying may be beneficial to the host cell invasion and angiogenesis, so it is expected to be a new effective means to save the blood vessels. Currently, four pigs have been transplanted with the rehydrated vessels, and all of the four have survived for more than 3 weeks.
Animals ; Aorta ; anatomy & histology ; Freeze Drying ; Swine ; anatomy & histology

Now the clinical preservation methods of human red blood cells mainly include hypothermic storage (4 degrees C) and cryopreservation (-80 degrees C or -196 degrees C). The preservation time of hypothermic storage of red blood cells is relatively short and it is easy to be contaminated by microbes. Cryopreservation greatly prolongs the storage time, but it needs heavy storage equipments. Because the protective solutions in cryopreservation contain glycerol, red blood cells need complicated washing in order to remove glycerol. These shortage methods limit their application to some special conditions, such as war or natural disasters. Compared with conventional preservation methods of red blood cells, lyophilization has many advantages such as less weight, convenient transportation, room temperature preservation, prone to be rehydrated. In this review, the progress and challenge in the development of lyophilization of red blood cells, especially application of trehalose and its mechanism in the lyophilization of red blood cells were systematically discussed. This review can provide some theoretic guidance for developing a safe, simple and efficient preservation approach of red blood cells by lyophilization.
Blood Preservation ; Cryopreservation ; Erythrocytes ; Freeze Drying ; Humans ; Trehalose ; pharmacology

OBJECTIVETo investigate the different parameters of the lyophilization procedures that affect the recovery of the rehydrated red blood cells (RBCs).

METHODSHuman RBCs loaded in tubes were cooled with 4 different modes and subjected to water bath at 25 degrees celsius;. The morphological changes of the RBCs were observed to assess the degree of vitrification, and the specimens were placed in the freeze-dryer with the temperature set up at 40, -50, -60, -70 and -80 degrees celsius;. The rates of temperature rise of the main and secondary drying in the lyophilization procedures were compared, and the water residue in the specimens was determined.

RESULTSThe protectant did not show ice crystal in the course of freezing and thawing. No significant difference was found in the recovery rate of the rehydrated RBCs freeze-dried at the minimum temperature of -70 degrees celsius; and -80 degrees celsius; (P > 0.05). The E procedure resulted in the maximum recovery of the RBCs (83.14% ± 9.55%) and Hb (85.33% ± 11.42%), showing significant differences from the other groups(P < 0.01 or 0.05). The recovery of the RBCs showed a positive correlation to the water residue in the samples.

CONCLUSIONFast cooling in liquid nitrogen and shelf precooling at -70 degrees celsius; with a moderate rate of temperature rise in lyophylization and a start dry temperature close to the shelf equilibrium temperature produce optimal freeze-drying result of human RBCs.