Biomedical subjects
Publications and source records attributed to R S Squire.
Tumours of the salivary gland are very uncommon in children. We present a case of sialoblastoma, a very rare congenital salivary-gland tumour, initially recognised on antenatal ultrasound. After histological diagnosis, a superficial parotidectomy was performed at 21 days of age with preservation of the facial nerve. There is no recurrence at2 years.
Recently developed synthetic Mimetic affinity ligands were screened for their ability to purify estradiol antibody from sheep serum. One of these ligands (color coded Yellow 1) effectively separated immunoglobulin from other serum protein by negative affinity. When 1 ml antiserum diluted 70% (protein content approximately 25 mg) was passed through 1 ml gel with Yellow 1 ligand, estradiol antibody-binding activity (% binding of E2 tracer) peaked in the effluent (62%) and decreased progressively in the subsequent three 4-ml fractions of the wash (34%, 6% and 2%, respectively). As long as the total amount of serum protein applied remained below the saturable-binding capacity of the ligand (determined to be approximately 28 mg), the relative purity of estradiol antibody in the effluent (E2 binding per unit protein) remained very high with only 3% (0.78 mg) of applied protein appearing in the effluent. Purity of antibody in the effluent was confirmed by electrophoresis carried out on SDS polyacrylamide gel. Flow rate of serum diluted 42% (1 ml, protein content approximately 48 mg) was constant and acceptable (0.37 ml/min) and uncoupling of nonimmunoglobulin serum protein from the ligand was complete by the time the column was reequilibrated. We conclude that of the different Mimetic ligands evaluated Yellow 1 has properties that would be useful in a large-scale affinity chromatography procedure for purifying immunoglobulin from sheep serum.
Micromole quantities of radiolabeled fatty acylcarnitines of high specific activity were synthesized by a simple one-step, one-pot acylation of [3H]carnitine in the presence of the respective fatty acid and acid chloride. The acylated product was isolated in high yield and high purity using liquid-liquid partitioning with isopropanol:hydrochloric acid:heptane (4:1:12 v/v) followed by butanol extraction. Product recovery was 91% for octanoyl[3H]carnitine and 90% for palmitoyl[3H]carnitine and contamination of both products with carnitine was less than 1%. The method is simple and fast, and results in high yields of pure fatty acylcarnitine in micromole scale.