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PubMedDate not supplied

Preparation and stability of liposome-type artificial red blood cells stabilized with carboxymethylchitin.

Liposome-type artificial red blood cells stabilized with carboxymethylchitin (mean diameter 310 nm) were prepared by a two-step emulsification technique. Sheep haemolysate was dispersed as fine droplets in a lecithin solution in dichloromethane to yield a W/O-type emulsion. The W/O emulsion thus obtained was then dispersed in an aqueous carboxymethylchitin solution to give a W/O/W-type complex emulsion. Removal of the organic solvent by evaporation from the complex emulsion left an aqueous suspension of the artificial red blood cells. The haemoglobin-trapping efficiency of the cells was found strongly dependent on the pH of the carboxymethylchitin solution used. The artificial red blood cells underwent disintegration by the action of surfactants. When a comparison was made among those surfactants which have the same alkyl chain length, the degree of cell disintegration was in the increasing order, anionic greater than cationic greater than nonionic. Globulin and fibrinogen produced no disintegration of the cells while albumin disrupted the cells to a slight extent.

Animals↗
PubMed1984

Developmental changes in serum ferritin concentration of dairy calves.

Serum ferritin concentration of nursing calves was measured by a two-site immunoradiometric assay to assess developmental changes and to evaluate relationships of serum ferritin with iron-related blood characteristics. Serum ferritin concentration of calves was low at birth and elevated slightly at 3 days of age. From 1 wk of age onward, serum ferritin concentration of untreated calves and calves fed only whole milk for 4 wk decreased and remained low throughout the nursing period. This finding almost coincided with hematological characteristics. However, that nearly normal hematological measures and weight gain persisted and that they did not develop any anemic symptom indicate that serum ferritin concentration is more sensitive than other hematological characteristics to iron depletion. However, serum ferritin concentration of calves administered 130 mg of ferrous fumarate (40 mg iron) daily from 3 to 22 days of age or injected with 4 ml of iron-dextran intramuscularly (400 mg iron) at 3 days and 2 wk of age increased sharply just after treatment and persisted high for 2 to 6 wk of age. However, there was large variation between animals for serum ferritin concentration. Thus, it seems likely that serum ferritin concentration is an index for monitoring prelatent iron deficiency of calves.

Administration, Oral↗
PubMed1999

Iron management: innovative solutions to persistent challenges--focus on Ferrlecit.

The use of sodium ferric gluconate in sucrose injection (Ferrlecit) in the treatment of anemia in patients with end stage renal disease (ESRD) was the major topic at the symposium "Iron Management: Innovative Solutions to Persistent Challenges," held April 14, 1999 during the annual ANNA 30th National Symposium in Baltimore, Maryland. Chairperson Susan Vogel, MHA, RN, CNN, addressed the challenges of anemia management and the limitations of oral iron supplements. She described available intravenous (i.v.) iron therapies and reviewed clinical trial data that demonstrated an excellent safety and efficacy profile for the newly approved i.v. iron supplement, sodium ferric gluconate. Suzanne Schweitzer, RPh, MPH, discussed iron metabolism and the U.S. labeling for sodium ferric gluconate, with a focus on dosing and administration. In the final presentation, Suzanne Seiler, RN, described her clinic's experience with sodium ferric gluconate and provided an experimental dosing and monitoring protocol. Together, these presentations suggest that sodium ferric gluconate is an important new tool for meeting the challenges of iron management in ESRD patients.

Anemia, Iron-Deficiency↗
PubMed1977

Simultaneous spectrophotometry of Fe2+ and Cu2+ in serum denatured with guanidine hydrochloride.

We show how iron and copper ions may be simultaneously measured in 0.2 ml of serum after using guanidine hydrochloride to cause their release from protein. Sensitive reagents for iron (2,4,6-tripyridyl-s-triazine) and copper (disodium 2,9-dimethyl-4,7-diphenyl-1, 10-phenanthroline disulfonate) facilitate such measurement. We eliminated spectral interference between the two metal-ion complexes by selective use of pH. Results compare well with those obtained by accepted methods in which the concentrations of these ions are measured independently.

Copper↗