Identification of 3-MCPD esters to verify the adulteration of extra virgin olive oil.

The adulteration of olive oil is an important issue around the world. This paper reports an indirect method by which to identify 3-monochloropropane-1,2-diol (3-MCPD) esters in olive oils. Following sample preparation, the samples were spiked with 1,2-bis-palmitoyl-3-chloropropanediol standard for analysis using gas chromatograph-tandem mass spectrometry. The total recovery ranged from 102.8% to 105.5%, the coefficient of variation ranged from 1.1% to 10.1%, and the limit of quantification was 0.125 mg/kg. The content of 3-MCPD esters in samples of refined olive oil (0.97-20.53 mg/kg) exceeded those of extra virgin olive oil (non-detected to 0.24 mg/kg). These results indicate that the oil refining process increased the content of 3-MCPD esters, which means that they could be used as a target compound for the differentiation of extra virgin olive oil from refined olive oil in order to prevent adulteration.

Serum immunoglobulin E levels in patients with primary hypogammaglobulinemia - experience from a tertiary hospital in Taiwan.

BACKGROUND AND PURPOSE: Primary hypogammaglobulinemia has been proposed to be associated with an increased incidence of allergic diseases, but the correlation between the clinical presentation and the serum immunoglobulin E (IgE) level has not been studied in this patient group. This study investigated the correlation of IgE levels and allergic condition in patients with primary hypogammaglobulinemia. METHODS: Thirty five patients with primary hypogammaglobulinemia were enrolled from September 2004 to March 2005. Serum IgE levels were measured at clinic follow-up. Information regarding the patient's history of allergic diseases, including atopic dermatitis, allergic rhinitis, allergic conjunctivitis, and asthma, were collected from chart review and clinic interviews. RESULTS: Significantly lower mean +/- standard deviation serum IgE levels were found in allergic patients with primary hypogammaglobulinemia (123.9 +/- 148.8 IU/mL) than in the healthy control group (376.2 +/- 471.7 IU/mL) [p < 0.005] or in allergic patients without primary hypogammaglobulinemia (544.1 +/- 309.1 IU/mL) [p < 0.001]. CONCLUSIONS: Serum IgE level is not a suitable diagnostic criterion or treatment guide for allergy in patients with primary hypogammaglobulinemia.