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Determination of Methanol and Ethanol Concentrations in Local And Tulashie et al. International Journal of Food Contamination (2017) 4:14 International Journal DOI 10.1186/s40550-017-0059-5 of Food Contamination DATA ARTICLE Open Access Determination of methanol and ethanol concentrations in local and foreign alcoholic drinks and food products (Banku, Ga kenkey, Fante kenkey and Hausa koko) in Ghana Samuel Kofi Tulashie1*, Amponsah Preko Appiah1, George Dzidefo Torku1, Albert Yaw Darko2 and Augustus Wiredu2 Abstract Background: It is believed that higher methanol content may be present in some alcoholic drinks produced by traditional distilleries or some alcohol brewing companies. As a result of this, there could be a higher risk of methanol concentration in products. Therefore, this research focused on quantifying the amount of methanol in some fermented foods and alcoholic drinks by Gas Chromatography. The method was validated for limit of detection, limit of quantification, and recovery. Results: The results showed some level of methanol in some of the studied local and foreign alcoholic drinks between the ranges of 0.003-0.161% Vol. whereas no methanol was observed in any of the analyzed food products. Conclusions: The results showed that the levels of methanol observed in the analyzed drinks do not pose any health threat to the human body when consumed, contrary to the general assumptions that it does. However, the normal alcohol health risk associated with high consumption still remains a problem. Keywords: Akpeteshie, Methanol, Hausa koko, Kenkey, Banku Background fermentation or decomposition and simple distillation Alcohol can be described as a psychoactive drug which (Manoel, Teresa, José, & Cássia, 2014). It is assumed that has extensive applications in both industries and house- most traditional alcohol manufacturers are ignorant holds. Alcohol can be produced locally or industrially in about the basic chemical compositions of the alcohol large or small quantities based on the available resources they produce and hence may end up producing alcoholic across the world (ePURE, 2017). Most farmers engage in drinks with higher methanol content and other potential alcohol production not only as a means to generate health threatening components (Jurgen, et al., 2014). income to earn a living, but also due to the high level of Dangerous chemical compositions such as lead and demand and use in diverse ways by consumers across methanol present in alcohol pose a threat to human the globe (Glithero et al. 2013). The sources of raw health. Ethanol and methanol have similar physicochem- materials for the production of alcohol can be obtained ical properties and are present as by-products after dis- from fruits, cassava, palm wine, sugar cane, etc. The tillation (Jurgen, Fotis, & Dirk, 2010). According to basic method for the production of alcohol is by World Health Organization (WHO), the harmful use of alcohol causes an estimated 2.5 million deaths every * Correspondence: [email protected] year, of which a significant proportion occurs in the 1School of Physical Sciences, Department of Chemistry, Industrial Chemistry young. There is also emerging evidence that the harmful Section, University of Cape Coast, Cape Coast, Ghana use of alcohol contributes to the health burden caused Full list of author information is available at the end of the article © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Tulashie et al. International Journal of Food Contamination (2017) 4:14 Page 2 of 5 by communicable diseases such as tuberculosis and (traditional) brewery. The selected local food products HIV/AIDS (WHO, 2004). (Banku, Ga kenkey, Fante kenkey and Hausa koko) were The quality of alcoholic beverages in Ghana (especially purchased from the University of Cape Coast, UCC the traditionally brewed) has been a source of concern (science market) in the central region of Ghana. These for some time (Luginaah and Dakubo 2003). It is food products with the exception of Hausa koko were all believed that methanol may be generated in alcoholic produced from fermented corn dough. Hausa koko on drinks during the fermentation process. The lack of the other hand was produced from milled millet grains proper fermentation and distillation techniques by trad- that were allowed to stand and ferment for some days. itional or artisanal distilleries and some commercial The purchased samples were then given unique serial operators may be a factor to high risk of methanol con- numbers. tent in the products (Elijah 2016). Also, the complica- tions and chronic diseases or ill health such as blindness, dizziness, respiratory diseases etc., associated Reagents with drunkenness suggested that there may be the pres- Analytical grade reagents were utilized. Standard refer- ence of methanol and other toxic substance in the drink ence solutions of Methanol, Isopropyl alcohol and that affects the health of the people (Lachenmeier 2007). distilled water were used for the development of the GC Methanol is a chemical solvent, widely used in products calibration curve for this work. such as paints, gasoline, and photocopying fluid. Metha- nol occurs naturally in food, notably in fresh fruits, vege- tables and their juices. It occurs as free methanol, Sample preparation methyl esters of fatty acids or methoxy groups on poly- 2.5 ml of each alcoholic beverage sample was measured saccharides such as pectin from which it can be released into a measuring cylinder and topped up with de-ionized by digestion. Pectin is broken down during digestion in water to the mark. The food samples were prepared by the colon, from where methanol can be absorbed. This measuring the mass, 154.75 g, 210.00 g, 214.91 g and means that the potential methanol intake from the diet 245.55 g of Banku, Hausa koko, Ga kenkey and Fante is higher than analysis of the free methanol content of kenkey respectively and were dissolved separately in de-- individual foodstuffs (Lang et al. 2006). The ingestion of ionized water. Filtration was done to obtain a clear solu- as little as 10 ml of methanol can cause permanent blind- tion for GC analyses. A portion of the prepared sample ness and 30 ml can be fatal (Lal et al. 2001). Methanol is was then used for the GC analysis. metabolized by alcohol dehydrogenase that converts it to formaldehyde and finally to formic acid, the metabolite re- sponsible for its toxicity. Folate is necessary to metabolize and excrete formic acid (Lal et al. 2001). Observed human Table 1 Detailed description of the operating conditions of oral lethal dosage of methanol via ingestion ranges from the GC 15 to 250 g (Gibel et al. 1969). Parameter Value This work focuses on quantifying the concentrations Injector temperature set point 120 °C of methanol in both local and foreign alcoholic drinks and some fermented food products (Banku, Ga kenkey, Injector flow rate 21 ml/min Fante kenkey and Hausa koko) in Ghana by using Gas Type of column Packed Column Chromatography with thermal conductivity detector FFAP 15% Chromosorb which (GC-TCD) as an analytical method. is highly polar Column flow rate 20 ml/min Methods Initial oven temperature 60 °C on hold for 5 min Sampling Final oven temperature 120 °C on hold for 5 min Twenty samples of most commonly used local and Temperature increases interval at 10 °C/min interval foreign alcoholic beverages in Ghana were randomly Detector temperature 250 °C purchased from various shops in the Greater Accra and Volta regions of Ghana. The selected alcoholic beverages Reference flow rate 50 ml were in the categories of spirits, wines and herbal bitters. Limit Of detection (Methanol) 1.43 × 10−4%Vol The raw materials for the foreign beverages differed Limit of detection (Ethanol) 1.54 × 10−4%Vol from one another, but were mostly cereals and fruits as Limit of quantification (Methanol) 4.77 × 10−4%Vol well as selected herbs which were fermented and −4 Limit of quantification (Ethanol) 5.12 × 10 %Vol distilled industrially. However, all samples of the locally Recovery Range % 80%–100% made spirit (Akpeteshie) were produced by artisanal Tulashie et al. International Journal of Food Contamination (2017) 4:14 Page 3 of 5 Table 2 Summary of the mean concentrations of methanol and ethanol in the analyzed alcoholic drinks Drinking spot Location Alcohol type Origin Code Methanol (%vol) Ethanol (%vol) Maxi spot Mafi Asiekpe Spirit Local S2 – 37 Home Osu-Nyaneba Est. Wine Foreign S3 0.009 12 Home Osu- Nyaneba Est. Whisky/spirit Foreign S4 0.007 40 Home Osu- Nyaneba Est. Wine Foreign S5 0.007 17 Maxi spot Mafi Asiekpe Bitters/spirit Local S6 40 Distillation point Mafi Mankukope Akpeteshie/spirit Local S7 0.052 45 Maxi spot Mafi Asiekpe bitters/spirit Local S8 – 29 Maxi spot Mafi Asiekpe bitters/spirit, med. Alcohol Local S9 – 32 Home Osu-Nyaneba Est. Wine Foreign S10 0.003 8 Maxi spot Mafi Asiekpe dry gin/spirit Local S11 – 37 Desiadenyo spot Mafi Asiekpe Spirit Local S12 – 31 Desiadenyo spot Mafi Asiekpe spirit, med. Alcohol Local S13 – 37 Desiadenyo spot Mafi Asiekpe bitters/spirit Local S14 0.063 38 Maxi spot Mafi Asiekpe spirit, med. Alcohol Local S15 0.112 22 TOR Bush Canteen Tema-Accra Akpeteshie/spirit Local S16 – 36 Original Auntie BB Osu-Nyaneba Est. Akpeteshie/spirit Local S17 0.126 42 VYKISS spot Osu-Ako-Adjei spirit, med. Alcohol Local S18 0.142 43 Auntie Afi’s Enterprise Osu-Ako-Adjei Akpeteshie/spirit Local S19 0.141 39 Jomens Enterprise Osu-Ako-Adjei Akpeteshie/spirit Local S20 0.161 39 Note that the brand names of these alcoholic beverages have been withheld for security reasons Instrumentation amount of methanol and ethanol concentrations among For the quantification of the methanol and ethanol con- the analyzed samples in all cases.
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