There are several processes including fermentation that are crucial during alcohol production and understanding the pathway yeast utilizes during fermentation can help improve this precise process. Various alcohols and spirits are derived only when the starch present in their ingredients are converted into sugar before being fermented into ethanol or alcohol.

Active yeast is utilized in making various products including breads, cakes, alcohols, spirits, etc. Yeast is a micro-organism that belongs to the fungi family and the addition of yeast into a mixture containing water and starch-rich ingredients such as fruits, vegetables or grains starts a chemical reaction depending on several other conditions. These conditions along with the type of yeast used for fermentation determine the pathway taken by the particular yeast to convert that mixture into alcohol with the desired strength, taste and color.

The yeast fermentation process starts as soon as yeast comes in contact with sugars such as glucose, sucrose, fructose, dextrose, maltose, etc. Yeast can act only on fermentable sugars while other sugars can be left in the alcohol as per the requirements of the alcohol producer. Various types of yeasts need to be used in order to produce different types of alcohols and spirits. Thus, beer would require the use of saccharomyces cerevisiae yeast while wine requires wine yeast that can survive in stronger alcohols while vodka needs to be fermented only with vodka yeast that is extremely hardy yeast with very high alcohol tolerance. However, once any type of yeast is mixed into the required mixture then these micro-organisms spearhead a chemical reaction that follows different fermentation pathways based on the fermenting conditions.

During fermentation yeast first converts sugars in the mixture such as glucose into pyruvic acid. If there is no oxygen in the mixing tank during fermentation then this condition is known as anaerobic condition and there is one pathway yeast might follow depending on the type of yeast used for fermentation. One pathway is to convert each molecule of glucose into two molecules of ethanol and two molecules of carbon dioxide. Another pathway that yeast might take is the lactic acid conversion pathway where it converts into lactate. Humans too contain cells that process pyruvic acid but since they do not fulfill other conditions for conversion to alcohol, their cells follow the lactic acid pathway.

Several eminent scientists have closely followed and studied these pathways under extremely powerful microscopes to figure out the complex processes followed by various brewing yeast and distillers yeast to convert various sugars into ethanol alcohol. These studies help in developing better types of instant yeast such as turbo yeast that has better alcohol tolerance and can also ferment efficiently at higher temperatures. Stronger alcohols and spirits such as whiskey and vodka also need to pass through the distillation process in order to increase their alcohol strength and this process is applied after fermentation.

Alcohol is derived once the starch-rich mixture of water with grains, vegetables or fruits passes through the appropriate fermentation process that guides the yeast through the right pathways to convert sugar into alcohol. Understanding the pathway yeast utilizes during fermentation can result in high quality alcohols with that perfect taste, strength, color and character that can impress any drinker with the very first sip.