Arielle Cruz
Copper is an essential element for all aerobic organisms, playing a key role in oxygen metabolism. While it is naturally present in alcoholic beverages like wine, its levels must be carefully monitored due to potential health risks. Determining the quantity of copper in alcohol is crucial for ensuring consumer safety and maintaining the desired sensory qualities of the beverage. This involves employing analytical techniques such as high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) and assessing the impact of copper on the distillation process and flavour development. The presence of copper in alcohol has sparked discussions about its potential benefits and risks, with studies exploring its effects on neurological diseases and its role in spirit production.
Characteristics and Values of Copper in Alcohol
| Characteristics | Values |
|---|---|
| Copper is a chemical element with the symbol | Cu |
| Copper is essential to all aerobic organisms | Cu is associated with oxygen metabolism |
| Copper is found in the human body | Adult humans contain between 1.4 and 2.1 mg of copper per kilogram of body weight |
| Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity | Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys |
| Copper is an excellent conductor of heat | Copper is used in the production of whisky |
| Copper contributes to the formation of fruity and aromatic flavors in whisky | Copper acts as a catalyst to accelerate chemical reactions |
| Copper concentration in wine | Copper content in wine ranges from 0.1 to 1 mg/l |
| Copper concentration in alcoholic drinks | Copper concentration was lower than 1.28 mg L−1 in alcoholic drinks |
| Limits of Quantification (LOQs) for Cu using Ag as IS | 0.016 mg L−1 |
| Precision expressed as relative standard deviation (RSD) for Cu | Lower than 4% |
| Copper toxicity | Gram quantities of copper salts can cause acute copper toxicity, leading to irreversible liver failure |
| Risk assessment | The risk of copper toxicity from alcoholic beverages requires further scientific analysis and regulatory interventions |
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What You'll Learn
Using high-resolution continuum source flame atomic absorption spectrometry
High-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) is a simple, rapid, direct, and multi-element method used to determine the quantity of copper in alcoholic and non-alcoholic drinks. This technique is capable of directly determining the presence of Zn, Cu, and Pb without prior sample treatment. It is particularly useful for analysing beverages with varying sugar and alcohol contents.
To perform the analysis, the main absorption lines for the analytes (Cu, Zn, and Pb) and the internal standards (IS) (Ag, Co, Ni, and Bi) are chosen. The IS calibration method is employed to minimise interferences due to different component contents in the samples, such as alcohol and sugar. This method allows for the direct analysis of drinks with different compositions using a single calibration curve.
The HR-CS FAAS technique offers flexibility in sample introduction, accommodating both continuous and discontinuous modes. This feature helps reduce sample consumption. The precision of the method, expressed as relative standard deviation (RSD), is typically lower than 4% for the analytes.
The limits of quantification (LOQs) obtained using Ag as IS and the continuous sample introduction mode are 0.040 mg L−1 for Zn, 0.016 mg L−1 for Cu, and 0.099 mg L−1 for Pb. These values indicate the sensitivity and accuracy of the HR-CS FAAS method in quantifying the respective elements.
Overall, high-resolution continuum source flame atomic absorption spectrometry is a reliable and effective technique for determining the quantity of copper in alcoholic beverages, providing successful results and accommodating a wide range of sample characteristics.
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The role of copper in spirit production
Copper plays a significant role in spirit production, particularly in the distillation process and the construction of stills. Its unique physical and chemical properties make it an ideal material for creating alembic (pot) stills used in whisky production.
Firstly, copper is an excellent conductor of heat. This property allows for efficient and precise temperature control during distillation. It quickly absorbs and transfers heat, which is crucial for the evaporation of the alcoholic liquid.
Secondly, copper is a malleable metal, making it easy to shape and work with during still construction. Coppersmiths can create complex and efficient still designs, incorporating bends and curves to maximise copper contact with the rising vapours. The size and shape of the pot still contribute to the aroma of the whisky, with longer copper contact resulting in a lighter spirit.
Additionally, copper has a great affinity for sulphur and its various forms. During distillation, the alcoholic liquid is heated and begins to evaporate. As the hot vapours come into contact with the copper surface, various chemical reactions occur. The volatile sulphur compounds react with copper to form copper sulphides, which are deposited as black substances on the inside of the pot stills. This interaction helps to reduce odour-intensive sulphur compounds, improving the aroma of the spirit.
Furthermore, copper acts as a catalyst, accelerating chemical reactions and contributing to the formation of fruity and aromatic flavours. It also facilitates ester formation and copper filtration, enhancing the overall character of the spirit.
The chemical properties of copper, combined with its resistance to corrosion, especially when in contact with alcohol and acidic solutions, make it a vital component in spirit production. Its role in flavour development and the breakdown of sulphur compounds contribute to the unique characteristics of the final product.
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Copper toxicity and human health risks
Copper is an essential trace mineral that is a component of many proteins and helps the body produce energy, supports healthy blood vessels, boosts the immune system, aids brain development, and supports the nervous system. However, it is possible to get too much copper, which can lead to copper toxicity. Consuming excess copper salts can cause copperiedus, but most cases of copper toxicity are the result of the genetic condition Wilson's disease, which causes the body to retain copper as it is not excreted by the liver into the bile. If left untreated, Wilson's disease can lead to brain and liver damage. Another inherited condition, Menke's disease, causes disruption of connective tissue due to mutations in genes. Menke's disease can be treated with copper-histidine treatment.
Acute symptoms of copper poisoning by ingestion include vomiting, hematemesis (vomiting of blood), hypotension (low blood pressure), melena (black "tarry" faeces), coma, jaundice (yellowish pigmentation of the skin), and gastrointestinal distress. Nausea and vomiting are the two most common symptoms of copper toxicity. Other symptoms of excess copper include mood swings, irritability, depression, fatigue, excitation, difficulty focusing, and feeling out of control.
One manifestation of copper toxicity is cirrhosis of the liver in children (Indian childhood cirrhosis), which has been linked to boiling milk in copper cookware. A study of deaths from cirrhosis among children under 6 years of age exposed to tap water containing copper at 8.5 to 8.8 mg/L in three towns in Massachusetts found no deaths from cirrhosis among those children. However, the small number of children involved and the variability in exposure depending on whether the child was breastfed or formula-fed put that conclusion into question.
The U.S. Environmental Protection Agency's Maximum Contaminant Level (MCL) in drinking water is 1.3 milligrams per liter, which is considered safe for human consumption over a lifetime. The Occupational Safety and Health Administration (OSHA) has set a limit of 0.1 mg/m3 for copper fumes and 1 mg/m3 for copper dusts and mists in workroom air during an eight-hour work shift, 40-hour work week.
Copper toxicity can be diagnosed through testing, including a total copper blood test or total copper serum test. Treatment options include stomach pumping (gastric lavage) to remove copper from the stomach. In cases of suspected copper poisoning, penicillamine is the drug of choice, and dimercaprol, a heavy metal chelating agent, is often administered.
Copper is commonly found in alcoholic beverages, particularly in wine, where the copper concentration can be as high as 1 mg/L. It is also used in the production of whisky, where it acts as a catalyst to accelerate chemical reactions and contribute to the formation of fruity and aromatic flavors. A simple and direct method to determine the presence of copper in alcoholic beverages is through high-resolution continuum source flame atomic absorption spectrometry and internal standardization.
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Copper concentration in alcoholic beverages
Copper is an important component in the production of alcoholic beverages, particularly in the distillation process. Its unique chemical properties make it ideal for this purpose, as it helps to remove odour-intensive sulfur compounds and accelerate chemical reactions, contributing to the formation of fruity and aromatic flavours in the final product.
The concentration of copper in alcoholic beverages can vary depending on the type of beverage and the production process. Wine, for example, typically contains copper in the range of 0.1 to 1 mg/L, while the Cu concentration in distilled alcoholic beverages like rum and brandy was found to be statistically lower than in gins and alcoholic liquors. In another study, the Cu concentration in alcoholic drinks was found to be lower than 1.28 mg/L, while non-alcoholic drinks had a concentration of less than 0.15 mg/L.
The presence of copper in alcoholic beverages can also be a result of the distillation equipment used. Copper stills are commonly used in the production of whisky, and the size and shape of these stills can affect the aroma and flavour of the final product. The varying contact times of the rising vapours with the copper surface contribute to the different reaction times and, consequently, the quality and quantity of sulfur compounds created.
While copper is essential in the production process, its direct contact with alcoholic beverages is subject to regulations. The 2017 Food and Drug Administration (FDA) Model Food Code prohibits the use of copper for distilling and serving alcoholic beverages, except during the pre-fermentation and fermentation steps of beer brewing, where low levels of copper are necessary for yeast fermentation.
The determination of copper concentration in alcoholic beverages can be achieved through analytical methods such as high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS). This technique allows for the direct measurement of copper content in a variety of beverages, providing valuable information for quality control, regulatory compliance, and consumer safety.
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Copper as a food contact surface
Copper is desirable as a food contact surface due to its thermal conductivity, aesthetic appeal, antimicrobial properties, and ability to enhance flavour. Copper mugs, for instance, are used to serve alcoholic beverages like mule cocktails, and it is believed that copper changes the flavour of the beverage as it is consumed. Copper is also critical to the production of fine brandy, as it is a required catalyst for the complex flavour and browning of brandy.
Despite its advantages, the use of copper as a food contact surface for acidic alcoholic beverages is prohibited by the 2017 Food and Drug Administration (FDA) Model Food Code. The Code specifically recommends that food or beverages with a pH less than 6.0 should not come into contact with copper or copper alloy materials due to the high risk of leaching from copperware. This is supported by experimental findings that demonstrate how acidic conditions enhance the release of copper from copperware to food and beverages.
However, there are exceptions to this prohibition. The 2017 FDA Model Food Code allows the use of copper during the pre-fermentation and fermentation steps of beer brewing, as the yeast uses low levels of copper as a metabolite necessary for fermentation. Copper is also permitted during the distillation process in food contact surfaces of a still in craft distilleries. The size and shape of a pot still contribute to the aroma of the whisky, as the different contact times of the rising vapours with copper result in varying reaction times and, consequently, the quality and quantity of the respective sulphur compounds formed.
To prevent excessive copper exposure, manufacturers often line the food-contact surfaces of copperware with a less reactive metal or a lacquer. Nevertheless, there is limited published information on the factors influencing copper release into food materials and effective measures to limit such transfer. While copper toxicity is rare, more research is recommended to identify safe levels of copper in liquor and align regulations with current allowable practices.
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Frequently asked questions
The safe level of copper in alcoholic beverages has not yet been determined. The 2017 FDA Model Food Code prohibits copper in contact with foods with a pH below 6.0, except during the pre-fermentation and fermentation steps of beer brewing.
Copper is used as a food contact surface during the distillation process in craft distilleries. It is also used in single-drink mugs for alcoholic beverages such as mule cocktails.
Copper is an essential mineral for all aerobic organisms, including humans. However, high levels of copper can lead to acute copper toxicity, resulting in irreversible liver failure.
The quantity of copper in alcohol can be determined using high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) and internal standardization. This method can analyze a large variety of beverages with different sugar and alcohol contents.
Copper toxicity can cause irreversible liver failure, Wilson's disease with copper accumulation, cirrhosis of the liver, and psychiatric symptoms.
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