Experimental replacements of rabbit vitreous by air, normal saline, dextran and Haemaccel were tried in albino rabbits. After aspiration of 0.7ml of liquid vitreous from the central portion of vitreous, 0.5ml of substitutes were injected. Clinically, these substitutes were well tolerated with slight uveal inflammation which subsided within one week. Intraocular pussure returned to normal value after 5 days. Hexosamine content of the whole vitreous samples showed moderate increase after Haemaccel injection which decreased slowly thereafter, whereas no significant changes were observed with other substitutes. Hydroxyproline content of the whole vitreous also showed marked increase after injection of Haemaccel, owing to the high hydroxyproline content of HaemacceJ. After 6 weeks 22.9% of the injected hydroxyproline remained in the vitreous. With other substitutes no change was observed.
Dextrans ; Hydroxyproline ; Inflammation ; Polygeline ; Rabbits ; Reference Values

Dextran is a highly viscous polysaccharide liquid used for uterine distention during hysteroscopic surgery. Although generally safe, this agent has been recognized to cause non-cardiogenic pulmonary edema, intravascular coagulopathy, renal insufficiency, and anaphylactic reaction. We report the case of pulmonary edema following hysteroscopic surgery with dextran 40 and discuss the major side effects and the possible etiologies of the reported complication.
Anaphylaxis ; Dextrans* ; Hysteroscopy* ; Pulmonary Edema* ; Renal Insufficiency

Dextranase can degrade dextran polymer into low molecular weight polysaccharide. Dextranase and its hydrolysates are widely used in food, medicine and chemical industries. Studies on dextranase progresses rapidly in recent years. We reviewed literature reports combined with our study about the progress of dextranase and its potential applications in industry. In addition, we addressed hot topics and emphasized on the current research about dextranase, existing problems in domesticstudies and the future research needs needs.
Dextranase ; chemistry ; Dextrans ; chemistry ; Molecular Weight ; Polymers

No abstract available.
Dextrans ; Giant Cells ; Granuloma, Foreign-Body

Matridex(R) is an injectable skin filler that's composed of a mixture of cross linked hyaluronic acid and dextranomer particles, and it was recently developed for soft tissue augmentation. To the best of our knowledge, there have been few previous reports on complications associated with Matridex. We report here on a delayed inflammatory reaction to an injection of Matridex in the glabellar fold, and this developed five weeks after the injection and it lasted more than a year. The patient was treated with oral doxycycline and intralesional injection of triamcinolone acetonide; this resulted in almost complete resolution of the lesion. The patient should be informed of the potential complications with the use of injectable fillers before treatment, for it could lead to undesirable aesthetic consequences.
Dextrans ; Doxycycline ; Humans ; Hyaluronic Acid ; Injections, Intralesional ; Skin ; Triamcinolone

Dextran 40, a polysaccharide with molecular weight of 40,000, has been used clinically for expansion of plasma volume, improvement of microcirculation in low flow states and thromboprophylaxis especially in major operation such as vascular and hip surgery. However severe anaphylactoid reaction to dextran 40 can occur rarely. We experienced a case of cardisc arrest due to a severe reaction of dextran 40 in a patient who underwent aortofemoral bypass surgery. The patient was resuscitated immediately and followed up carefully.
Dextrans* ; Heart Arrest ; Hip ; Humans ; Microcirculation ; Molecular Weight ; Plasma Volume

Dextran 40, a polysaccharide with molecular weight of 40,000, has been used clinically for expansion of plasma volume, improvement of microcirculation in low flow states and thromboprophylaxis especially in major operation such as vascular and hip surgery. However severe anaphylactoid reaction to dextran 40 can occur rarely. We experienced a case of cardisc arrest due to a severe reaction of dextran 40 in a patient who underwent aortofemoral bypass surgery. The patient was resuscitated immediately and followed up carefully.
Dextrans* ; Heart Arrest ; Hip ; Humans ; Microcirculation ; Molecular Weight ; Plasma Volume

BACKGROUND: Hemodilution reduces the concentration of clotting factors in blood and it may induce some degree of coagulation impairment. The goal of this study is to investigate the changes of coagulation status during progressive hemodilution with several solutions. METHODS: Sixty healthy patients were randomly allocated to six groups according to experimental solution, and each group contained 10 patients. Whole blood was diluted by 0%, 10%, 25%, 50% with 0.9% normal saline, 4% modified fluid gelatin, 10% pentastarch, 10% dextran 40 and two brands of 6% hydroxyethyl starchs (Salinehes(R) , HAES-steril(R) ). At each dilution, thromboelastographic parameters {(r, k, alpha angle, maximum amplitude (MA)} were measured using thromboelastography (TEG) and were compared with those of an undiluted specimen obtained concurrently from the same patients. RESULTS: Hemodilutions of 25% and 50% with 0.9% normal saline decreased r and k times, and increased alpha angle but there was no difference in MA. Hemodilutions of 10% and 25% with modified gelatin solution did not change the parameters. However, 50% hemodilution of the gelatin solution decreased the k time and increased alpha angle. Hemodilutions of more than 10% with 10% pentastarch increased the k time, decreased alpha angle and MA. Hemodilutions of more than 10% with 10% dextran 40 increased r and k times, and decreased alpha angles and MA according to the quantities of this dilutional solution. Hemodilutions of more than 25% with 10% dextran 40 increased k times above 400%. Hemodilutions of more than 10% of 6% HES (Salinehes(R) , M.W: 70,000 dalton) decreased MA. Hemodilutions of more than 10% of 6% HES (HAES-steril(R) , M.W: 200,000 dalton) decreased the alpha angle. CONCLUSIONS: 25% and 50% hemodilutions of 0.9% normal saline induce a hypercoagulable state, but hemodilutions of more than 10% with each colloid solution decreased coagulability of whole blood according to the degree of dilution, except in the case of modified fluid gelatin solution. Hemodilutions of more than 25% with 10% dextran 40 induce a severe coagulation impairment.
Colloids ; Dextrans ; Gelatin ; Hemodilution* ; Humans ; Hydroxyethyl Starch Derivatives ; Starch ; Thrombelastography*

Sixteen compounds were isolated from Conioselinum vaginatum by silica column chromatography over silica gel and Sephadex LH-20, as well as recrystallization. On the basis of their physical and chemical properties and spectral data, their structures were identified as ligustilide (1), 1,3-dilinolein (2), coniferaldehyde (3), myristicin (4), stigmasterol (5), beta-sitosterol (6), vanillin (7), pregnenolone (8), bergapten (9), xanthotoxin (10), methyl indole-3-carboxylate (11), ferulic acid (12), (E)-3-methoxy-4,5-methylenedioxy-cinnamic alcohol (13), p-hydroxybenzaldehyde (14), 3-methoxy-4,5-methylenedioxy-acetophenone (15), and alpha-(ethoxymethyl)-4-hydroxy- benzenemethanol (16). Among them, compound 15 was a new natural product, and compounds 2, 3, 10, 11, 14, and 16 were obtained from this genus for the first time.
Apiaceae ; chemistry ; Benzaldehydes ; chemistry ; Dextrans ; chemistry ; Drugs, Chinese Herbal ; chemistry ; Mass Spectrometry ; Molecular Structure ; Sitosterols ; chemistry

The permeability of rabbit corneal endothelium stored at 4 degrees C in M-K medium for period of 3, 5, 9 and 14 days to radioactive sucrose(molecular weight 360), inulin (molecular weight 5,200), and dextran (morecular weight 82,400) was measured. The corneal endothelium stored in M-K medium up to 14 days was examined with light and electron microscope. The endothelial permeability to non-electrolytes was decreased according to the molecular weight of these increased. The permeability of fresh cornea to suerose was about 4 times greater than to inulin and 50 times than to dextran, but in M-K medium stored groups the permeability to sucrose was about 2.5 times greater than to inulin and 36 times than to dextran. The permeability of M-K medium preserved cornea for 14 days was significantly different from that of fresh corneal endothelium. The light and electron microscopic findings of 3, 5 and 9 days stored corneal endothelium were almost normal except of early changes of mitochondria, but in the 14 days-stored groups there were marked degenerative change of cytoplasm and nucleus were noted.
Cornea ; Cytoplasm ; Dextrans ; Endothelium, Corneal* ; Inulin ; Mitochondria ; Molecular Weight ; Permeability* ; Sucrose