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1 As presented in this review, different studies have been performed focused mainly on the optimization of sensory characteristics and nutritional profile while new researches are in progress.
Liana Claudia Salanță
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Catherine Yang
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Salanță, L.C.; Coldea, T.E.; Ignat, M.V.; Pop, C.R.; Tofană, M.; Mudura, E.; Borșa, A.; Pasqualone, A.; Zhao, H. Non-Alcoholic and Craft Beer. Encyclopedia. Available online: https://encyclopedia.pub/entry/2980 (accessed on 26 April 2024).
Salanță LC, Coldea TE, Ignat MV, Pop CR, Tofană M, Mudura E, et al. Non-Alcoholic and Craft Beer. Encyclopedia. Available at: https://encyclopedia.pub/entry/2980. Accessed April 26, 2024.
Salanță, Liana Claudia, Teodora Emilia Coldea, Maria Valentina Ignat, Carmen Rodica Pop, Maria Tofană, Elena Mudura, Andrei Borșa, Antonella Pasqualone, Haifeng Zhao. "Non-Alcoholic and Craft Beer" Encyclopedia, https://encyclopedia.pub/entry/2980 (accessed April 26, 2024).
Salanță, L.C., Coldea, T.E., Ignat, M.V., Pop, C.R., Tofană, M., Mudura, E., Borșa, A., Pasqualone, A., & Zhao, H. (2020, November 11). Non-Alcoholic and Craft Beer. In Encyclopedia. https://encyclopedia.pub/entry/2980
Salanță, Liana Claudia, et al. "Non-Alcoholic and Craft Beer." Encyclopedia. Web. 11 November, 2020.
Non-Alcoholic and Craft Beer
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This entry is adapted from the peer-reviewed paper 10.3390/pr8111382

 Beer is the most consumed alcoholic beverage in the world and the third most popular beverage after water and tea. Emerging health-oriented lifestyle trends, demographics, stricter legislation, religious prohibitions, and consumers’ preferences have led to a strong and steady growth of interest for non-alcoholic beers (NABs), low-alcohol beers (LABs), as well for craft beers (CBs). Conventional beer, as the worlds most consumed alcoholic beverage, recently gained more recognition also due to its potential functionality associated with the high content of phenolic
antioxidants and low ethanol content. The increasing attention of consumers to health-issues linked to alcohol abuse urges breweries to expand the assortment of conventional beers through novel drinks concepts. The production of these beers employs several techniques that vary in performance, efficiency, and usability. Involved production technologies have been reviewed and evaluated in this paper in terms of efficiency and production costs, given the possibility that craft brewers might want to adapt them and finally introduce novel non-alcoholic drinks in the market. 

brewing dealcoholization non-alcoholic beer craft beer flavour

1. Introduction

Beer is one of the oldest fermented drink and most widely consumed alcoholic beverages in the world, produced 4th-millennium B.C. in the East, and later spread in ancient countries such as Egypt and Rome [1]. The brewing process can be divided into the following steps: Malting, milling, mashing, boiling, cooling, fermentation, maturation, filtration, carbonation, microbiological stabilization, and packaging. However, the advanced techniques have allowed brewers to produce beer in a more sophisticated and efficient way [2]. The huge popularity of beer arises from its pleasant sensory attributes and favorable nutritional characteristics as well as its lower cost, compared to other types of alcoholic beverages [2][3]. Also, beer gains interest due to the potential medicinal properties as a valuable source of vitamins, minerals, and antioxidants providing various health benefits [4]. Studies are suggesting that moderate beer consumption has significant effects on health, such as reducing the risk of cardiovascular disease, blood cholesterol level, diabetes, osteoporosis, dementia, and many others [5][6][7][8]. The potential health benefits of moderate beer consumption are restricted by the negative consequences of its alcohol and energy content [9]. However, there is potential to enhance the bioactive compounds of beer whilst reducing the alcohol and energy content through innovative brewing approaches, in terms of ingredients, brewing methods, and type of fermentation [10].

The production of beers with low alcohol content is a fast-growing segment in the global beer market [11]. Over the last few decades, multiple beer types and beer-like beverages have been developed worldwide, using different brewing process, technologies, and raw ingredients [12]. In Germany, a country with a vast tradition in beer production, according to the Reinheitsgebot, the sole ingredients used for obtaining beer are water, malted barley, hops (Humulus lupulus L.) and yeast [13][14]. The case is different in other countries, where laws governing beer production are less stringent and brewers have more flexibility. Wheat, rice, rye, oats, maize, unmalted barley, and to a lesser extent sorghum, millet, and cassava have all been used in brewing [15].

Thus, carbohydrate sources (adjuncts) like cereals (malted or unmalted) and sugar syrups are the most widely used, usually in conjunction with barley malt. Wheat and oat are commonly used as adjuncts due to their ability to promote foam stability, and before the use of hops, other bitter herbs (e.g., spruce twigs, pine needles and tree branches), spices, and flowers are added to spread different sensory profiles and to design special beers [16][17][18][19][20]. Moreover, from ancient times different fruits have also been used in brewing as sources of fermentable extract and as well as flavoring ingredients [12][15]. Fruits, wine, or honey are inoculated in the wort of beer due to their natural yeast sources. Perhaps given the global trend of wanting a healthier lifestyle and of improving product qualities, in the last decade the market of special beers has evolved significantly offering additional product traits such as enhanced functionality, new flavors, and tastes. These improvements went beyond the use of hops, which are nevertheless vital for the brewing industry [21], as they contribute significantly to the sensory properties of beer [22][23][24]. Lately, microbreweries are dedicated to the production of special beers, using fruits, honey, herbs, or spices to enhance the aroma and to provide flavors and colors that cannot be obtained from grains [25][26][27].

The brewers need to keep up with the consumers’ interests and needs while designing novel beers [28]. Brewers have adapted to such demands with continuous improvements and attempts to minimize the alcohol content of their products while maintaining other characteristics [29]. Consumers are looking for products as close as possible to the conventional types, from a sensory point of view, especially in what regards flavor characteristics [3][30].

A regular or conventional beer is an alcoholic beverage produced by the saccharification of starch and the fermentation of the resulting sugar. Beers can vary in alcohol content, bitterness, pH, turbidity, color, and most importantly, flavor. Beers are distinguished mainly according to their visual appearance (color and turbidity) and fermentation process. Currently, a wide variety of beers are available and most of them belong to one of three groups: High (or top) fermentation, known as ale; low (or bottom) fermentation, known as lager; non-alcoholic-beers (NAB), which includes the low-alcohol beers (<2.5%, v/v) and alcohol-free beers (≤1% v/v) [31]. Low-alcohol beer (LAB), also known as “low alcoholic beer,” “lower-alcohol beer,” “low-point beer,” “alcohol-reduced beer,” and sometimes referred to as “light beer,” has different definitions and the alcohol by volume limits depend on laws in different countries [29]. In Germany, the USA, and in China, this limit is no more than 0.5% v/v; in Spain, the maximum value is 1% v/v alcohol; while in France, is of 1.2% v/v alcohol [32]. In Islamic countries such as Saudi Arabia and the United Arab Emirates, where alcohol consumption is prohibited by law, non-alcoholic beers (NABs) contain less than 0.5% v/v alcohol and represent an alternative to other non-alcoholic beverages because these provide some of the main bioactive components of traditional beer [33].

Over the past decade, there has been a global rise in the consumer interest in craft beers (CBs), particularly in traditional ales, and lagers, which are distinctively flavored, have a unique quality value and overall particular sensory properties [15]. Besides CBs are produced locally, in small quantities, are unpasteurized, unfiltered, and without added nitrogen or carbon dioxide pressure [34]. There are three major categories of brewers making CB and these are brewpubs, microbreweries, and regional craft breweries [35]. CBs are usually distributed regionally after they are produced in microbreweries following the basic brewing principles while using different adjuncts and yeast types, according to their consumers’ preferences [36].

Nowadays, NABs are experiencing an unprecedented boom on the craft side of the market. This segment of no/low ABV beer has changed drastically and quickly mainly due to the consumer demand (sportives, mothers, drivers, etc.) and advanced technology to brew non-alcoholic beer. This review’s purpose is to evaluate and discuss the production techniques of special beers such as NABs, LABs, and CBs focusing on the methods employed to improve their sensory characteristics appeal and to improve their popularity among consumers’.

2. An Overview of Non-Alcoholic and Craft Beer

2.1. Market Landscape and Consumers Preference

A beer’s quality is measured by a complex set of sensory characteristics that include appearance, aroma, taste, and texture as it is an incredibly versatile beverage, served in various locations such as clubs, bars, and restaurants. Given this context, there will always be a high demand for beer, particularly from male consumers. The common aim to improve public health without spoiling consumers’ enjoyment of certain beer types is an important matter for brewers and retailers [37]. Consumers are becoming ever more educated in what constitutes the appropriate flavor notes and “freshness” of beer [38], therefore there is a great challenge to try and reinvent certain beer types or to come up with completely new beer assortments. The future trends of beer production and products is best forecasted based on past statistics. As we can see, according to the European beer trends statistics report 2019 edition [39], in 2018, the top four beer producers of Europe consisted in Germany, with an overall beer production of 93,652 in 1000 HL, followed by Poland (42,603 in 1000 hL), United Kingdom (42,282 in 1000 hL), and Spain (38,134 in 1000 hL). Another report, the contribution made by beer to the European Economy [40], indicated that in 2018, more than 32 million hectoliters were exported from EU-28 countries outside the EU, which embodies over 8% of total production. This consists of large global brands, craft beers, and specialty brands made for export. It was also stated that there is increased investment in innovation, especially to produce new craft brews, expanding production lines to include cider and stout and to develop new beer flavors. Variety is looked for in all markets, therefore although conventional beer production is still heavily in the lead, craft beers, followed by specialty beers, alcohol-free, and low-alcohol beers, being so unique one to another would surely gain increased interest as time goes by. For example, the production of NAB (including malt beverages) increased in Germany from 5.4% in 2012 to 7.3% in 2018, while in Netherlands it went from 1.5% in 2012 to 5.2% in 2018 [40]. Having this in mind, it is still thought that economies of scope can prevail over economies of scale, at least in what regards beer production. Moreover, it is supposed that standard ale and lager consumption will decrease as consumers progressively choose to drink ‘Better, not more’, getting out of the comfort zone and into the experiment area [41].

3. New Trends Regarding Yeasts Involved in Fermentation of Special Beers

Beer is a perishable product and many factors can diminish a beer’s quality from the time it is brewed to the point of consumption. In the brewing process, the efficiency of fermentation and the character and quality of the final product are intimately linked [42]. The lactic acid bacteria are known as the most frequent bacteria found in beer, accounting for 60–70% of all spoilage incidents. Except some specific strains of lactic acid bacteria, which are found in some special beers, namely the ”sour beers” (Flanders Red Ale, Framboise, Kriek, the latest two also known as fruit Lambic beers), they are considered the spoilage bacteria in beer, which causes off-flavor development, which is mainly attributed to the formation of lactic acid and diacetyl [43][44][45]. The fermentation processes applied to foods and beverages in various technologies and operations are used to convert perishable and indigestible raw materials into pleasant foods and drinkable beverages with added value and high stability [46].

Beer, as a fermented beverage, is based on microbial metabolism for production. Saccharomyces cerevisiae is the dominant species, that is used in the production of alcoholic beverages worldwide. The strains of this species employed in fermentation exert a profound influence on the flavor and aroma characteristics of the resulted beverages [47]. Traditionally, strains of Saccharomyces cerevisiae and Saccharomyces pastorianus (synonym Saccharomyces carlsbergensis) are the two species widely used as starter cultures for the production of the two most categories of industrial beer, which are ‘ale’ and ‘lager’ beers, strains known as the top-fermenting and bottom-fermenting yeasts [48][49]. A perfect model of an organism may be considered Saccharomyces cerevisiae. Its short replication time, simple cultivation, sporulation efficiency, rare pathogenicity, and small genome size have made it an ideal research organism and placed it at the front of many scientific advances [50]. These strains of yeasts have become dominant, especially Saccharomyces cerevisiae, due to their alcohol tolerance and rapid fermentation rates, which are ideal for commercial beer production [10]. The current approaches have led to the exploration of various yeasts in the brewing process. This, akin to many of the developments in modern beer production, special beer production is largely driven by commercial reasons and for improving the product’s biological properties [10][15].

In this context, Saccharomyces boulardii is a new type of yeast, that acts as a probiotic yeast and tends to produce less alcohol. The probiotic yeast Saccharomyces boulardii is capable of fermenting brewery wort and optimizing the process variables led to improved production of volatile compounds by this yeast. The obtained product has similar sensory qualities with the traditional product, high commercial characteristics, and lower value of pH, which helps to maintain the beer’s shelf life [51]. It has also been described by Mulero-Cerezo et al. (2019) that Saccharomyces boulardii show higher viability during the fermentation process, which is ideal for producing a craft beer containing viable probiotic cells [34]. Several studies demonstrated that Saccharomyces boulardii can generate bioactive compounds in fermented beverages thus improving their functionality [52][53]. Other strains, such as Saccharomycodes ludwigii, Zygosaccharomyces rouxii [10], Torulaspora delbrueckii, Pichia kluyveri [48], Lachancea thermotolerans [54], and Brettanomyces spp. [55], have been assessed as candidates, producing a beer that is acceptable to consumers, commercially viable, and low in alcohol.

The new trend in brewing biotechnologies involves non-Saccharomyces yeasts in the fermentation process given the improvements they can produce in sensory quality and differentiation, especially in craft beers and low-alcohol beers [56]. For example, Brettanomyces spp. are essential in the production of lambic-style beers [49], where they contribute with flavors that are not normally produced by Saccharomyces spp. Often, Brettanomyces spp. can produce smoky, barnyard, spicy, and medicinal flavors in beverages [50]. On the other hand, Brettanomyces can produce β-glucosidase, an enzyme responsible for the hydrolysis of glycosides, commonly found in the hop and other sources. Therefore, this could increase or modify the hop aroma due to the numerous released monoterpenes, which are the key aroma substances from hop [49].

Lachancea thermotolerans is a yeast that can be used successfully in the making of craft beers because of its ability to ferment until 4–9% v/v producing high amounts of lactic acid from sugars and interesting effects in beer aroma. It is also a good candidate due to the natural biological acidification during the fermentation process [56]. Interestingly, Lachancea thermotolerans also can produce lactic acid, which can affect both flavor and mouthfeel. The beers obtained at the lower fermentation temperature (14°C) are associated with sensory-related words such as fruity, floral, sour, clove, melon, and strawberry [54]. Moreover, the ability to produce significant amounts of lactic acid make that strain suitable to be used in the production of acidic beers without the involvement of lactic bacteria [56]. Studies conducted by Zdaniewicz et al. (2020) confirmed that the Lachancea thermotolerans strains can produce lower alcohol as compared to Saccharomyces cerevisiae strains [57].

Torulaspora delbrueckii is another versatile yeast suitable for beer production [56], as it exhibits low alcohol production ability [58] due to its inability to utilize maltose [59]. This strain has the added advantage of being resistant to the various stress factors encountered during brewing [50] and to produce 2-phenyl ethyl acetate, a floral ester with positive floral aroma, that increases during fermentation [56]. Canonico et al. (2016) reported that the beers obtained with Torulaspora delbrueckii were characterized by a good aromatic profile and a low alcohol content (2.66% v/v) [60]. Following other studies [59][60], this yeast was found to be suitable for brewing applications.

Pichia kluyveri strain can be used for producing NAB or LAB owing to its limited ability to ferment glucose whilst significantly changing hop compounds into positive flavor compounds [61][62]. Pichia kluyveri produces much less diacetyl compared with the Saccharomyces cerevisiae brewers’ yeast strain. Also, the production of desirable ester compounds is high and leads to a lower production of unwanted acids such as octanoic acid and decanoic acid [59].

Zygosaccharomyces rouxii is the most xerotolerant yeast; this high osmotic tolerance could potentially be used in high gravity brewing since some strains have shown to ferment all wort sugars [62]. This yeast strain is also considered suitable for producing fermented beverages with low alcohol content because of its total or partial inability to ferment maltose [48]. After a fermentation process with Zygosaccharomyces rouxii, esters and higher alcohols are the main flavor-active compounds identified in beer [59].

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Subjects: Food Science & Technology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Liana Claudia Salanță
,
Teodora Emilia Coldea
,
Maria Valentina Ignat
,
Carmen Rodica Pop
,
Maria Tofană
,
Elena Mudura
,
Andrei Borșa
,
Antonella Pasqualone
,
Haifeng Zhao
View Times: 564
Revisions: 2 times (View History)
Update Date: 11 Nov 2020
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