stearates and Alcoholism

Topics: Alcohol Abstinence; Alcoholism; Biomarkers; Chronic Disease; Consensus; Forensic Toxicology; Glucuronates; Hair; Hair Preparations; Humans; Myristates; Oleic Acids; Palmitic Acids; Stearates; Substance Abuse Detection

This article presents results from 47 meconium samples, which were analyzed for fatty acid ethyl esters (FAEE) and ethyl glucuronide (EtG) for detection of gestational alcohol consumption. A validated microwave assisted extraction (MAE) method in combination with GC-MS developed in the Institute of Forensic Science (Santiago de Compostela) was used for FAEE and the cumulative concentration of ethyl myristate, ethyl palmitate and ethyl stearate with a cut-off of 600ng/g was applied for interpretation. A simple method for identification and quantification of EtG has been evaluated by ultrasonication followed solid phase extraction (SPE). Successful validation parameters were obtained for both biochemical markers of alcohol intake. FAEE and EtG concentrations in meconium ranged between values lower than LOD and 32,892ng/g or 218ng/g respectively. We have analyzed FAEE and EtG in the same meconium aliquot, enabling comparison of the efficiency of gestational ethanol exposure detection. Certain agreement between the two biomarkers was found as they are both a very specific alcohol markers, making it a useful analysis for confirmation.

Topics: Adult; Alcoholism; Biomarkers; Calibration; Chromatography, Liquid; Esterification; Esters; Fatty Acids; Female; Gas Chromatography-Mass Spectrometry; Glucuronates; Humans; Infant, Newborn; Meconium; Microwaves; Myristates; Palmitic Acids; Predictive Value of Tests; Pregnancy; Pregnancy Complications; Reference Standards; Reproducibility of Results; Solid Phase Extraction; Stearates; Substance Abuse Detection; Tandem Mass Spectrometry

The diagnosis of alcoholism is a topical subject of discussion; in fact, many studies have been published on the determination of biochemical markers useful to this target. Fatty acid ethyl esters (FAEE) are minor metabolites of ethanol, and their usefulness has been demonstrated by their detection in hair using a headspace solid-phase microextraction-gas chromatographic-mass spectrometric technique. Environmental contamination in the analysis of drugs of abuse is a well-known focus of discussion between scientists. In the same way, interference from the surroundings could be hypothesized in FAEE detection. To assess the influence of ethanol contamination, an in vitro experiment was performed, leaving hair in an atmosphere saturated with ethanol vapors for 15 days. The spontaneous production of FAEE was demonstrated by analyzing hair day by day. In fact, we observed a constant increase of ethyl myristate, palmitate, and stearate that reached very high concentrations at the end of the investigation. Although the experiment was managed in a stressed way and could not represent real life, its purpose was to focus the attention of researchers on the problem of hair contamination that can occur, for example, with ethanol-containing cosmetics. Therefore, care in interpretation must be taken into account, especially with such a volatile molecule.

Topics: Alcoholism; Artifacts; Esters; Ethanol; Fatty Acids; Forensic Medicine; Gas Chromatography-Mass Spectrometry; Hair; Humans; Myristates; Palmitic Acids; Stearates; Time Factors

Fatty acid ethyl esters (FAEE) can be used as alcohol markers in hair. It was investigated in this study whether this diagnostic method is disturbed by hair care and hair cosmetics. Traces of ethyl myristate, ethyl palmitate, ethyl oleate and ethyl stearate were detected in all of 49 frequently applied hair care products by headspace solid phase microextraction (HS-SPME) and gas chromatography-mass spectrometry (GC-MS). The highest concentration was 0.003% in a hair wax. From experiments with separated hair samples of alcoholics as well as from the evaluation of the FAEE concentrations and the data about hair care of 75 volunteers (alcoholics, social drinkers and teetotalers) follows that usual shampooing, permanent wave, dyeing, bleaching or shading are of minor importance as compared to the drinking amount and other individual features. However, false positive results were found after daily treatment with a hair lotion containing 62.5% ethanol, with a deodorant and with a hair spray. As an explanation, it is assumed that FAEE are formed in the sebum glands also after regular topical application of products with a higher ethanol content.

Topics: Alcohol Drinking; Alcoholism; Biomarkers; Deodorants; Ethyl Ethers; False Positive Reactions; Fatty Acids; Forensic Medicine; Gas Chromatography-Mass Spectrometry; Hair; Hair Preparations; Humans; Myristates; Oleic Acids; Palmitic Acids; Sebaceous Glands; Stearates; Substance Abuse Detection

Fatty acid ethyl esters (FAEEs) are products of nonoxidative ethanol metabolism. After incorporation in hair, they should be suitable long-term markers of alcohol abuse.. Hair samples from 19 alcoholics in a treatment program, 10 fatalities with verified excessive alcohol consumption, 13 moderate social drinkers who consumed up to 20 g ethanol/day, and 5 strict teetotalers were analyzed in 1-12 segments for four FAEEs (ethyl myristate, ethyl palmitate, ethyl oleate, and ethyl stearate) by external degreasing with n-heptane, extraction with a dimethyl sulfoxide-n-heptane mixture, headspace solid-phase microextraction of the extracts, and gas chromatography-mass spectrometry with deuterated internal standards. The n-heptane washings were analyzed in the same way for FAEEs from the hair surface.. The sum of the four ester concentrations in hair calculated for the proximal 0-6 cm segment was 2.5-13.5 ng/mg (mean, 6.8 ng/mg) for the fatalities, 0.92-11.6 ng/mg (mean, 4.0 ng/mg) for 17 of the alcoholics in treatment, 0.20-0.85 ng/mg (mean, 0.41 ng/mg) for the moderate social drinkers, and 0.06-0.37 ng/mg (mean, 0.16 ng/mg) for the teetotalers. In almost all cases the segmental concentrations increased from proximal to distal. There was no agreement between the self-reported drinking histories of the participants and the FAEE concentrations along the hair length. Ethyl oleate was the dominant ester in all samples.. FAEEs are deposited in hair mainly from sebum. Despite large individual differences, FAEE hair concentrations can be used as markers for excessive alcohol consumption with relatively high accuracy.

Topics: Alcohol Drinking; Alcoholic Intoxication; Alcoholism; Biomarkers; Fatty Acids; Gas Chromatography-Mass Spectrometry; Hair; Humans; Myristates; Oleic Acids; Palmitic Acids; Stearates; Substance Abuse Detection