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Coffee Extraction
Coffee extraction occurs when hot water is poured over coffee grounds, causing desirable compounds such as caffeine, carbohydrates, lipids, melanoidins and acids to be extracted from the grounds. The degree to which extraction occurs depends on a number of factors, such as water temperature, brewing time, grind fineness, and quantity of grounds. Definitions Brew ratio Brew ratio describes the ratio of coffee to water, by mass. Strength Also known as ''solubles concentration'', strength refers to the percentage of dissolved solids per unit of liquid in the final beverage. A higher concentration of solubles is associated with a stronger beverage, and lower concentration with a weaker, more "watery," beverage. Strength varies between coffee beverage types; for most it ranges from 1.15% and 1.35%. Ristretto, one of the strongest traditional coffee drinks, can contain up to 0.75 g of solubles per 15 gram serving (over 5% of total volume), making it more than four times as strong ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brewed Coffee
Brewed coffee is made by pouring hot water onto ground coffee beans, then allowing to brew. There are several methods for doing this, including using a filter, a percolator, and a French press. Terms used for the resulting coffee often reflect the method used, such as drip brewed coffee, filtered coffee, pour-over coffee, immersion brewed coffee, or simply coffee. Water seeps through the ground coffee, absorbing its constituent chemical compounds, and then passes through a filter. The used coffee grounds are retained in the filter, while the brewed coffee is collected in a vessel such as a carafe or pot. History Paper coffee filters were invented in Germany by Melitta Bentz in 1908 and are commonly used for drip brew all over the world. In 1954 the Wigomat, invented by Gottlob Widmann, was patented in Germany being the first electrical drip brewer. Drip brew coffee makers replaced the coffee percolator in the 1970s due to the percolators' tendency to over-extract coffee, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
French Press
A French press, also known as a cafetière, ''cafetière à piston'', ''caffettiera a stantuffo'', press pot, coffee press, or coffee plunger, is a coffee brewing device, although it can also be used for other tasks. In 1923 Ugo Paolini, an Italian, filed patent documents relating to a tomato juice separator and he developed the idea of making a coffee pot with a press action and a filter. He assigned his 1928 patent to Italian designer Attilio Calimani and Giulio Moneta who filed it in 1929. Nomenclature In English, the device is known in North America as a ''French press'' or ''coffee press''; in Britain and Ireland as a ''cafetière''; in New Zealand, Australia, and South Africa as a ''coffee plunger'', and coffee brewed in it as ''plunger coffee''. In Italian, it is known as a ; in German as a ' ("stamp pot") or ' ("coffee press"); in French as ', or simply as ' (also the usage in Dutch), though some speakers might also use genericized trademarks, such as Melior or Bodum. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lungo
Lungo (Italian for "long") is a coffee beverage made by using an espresso machine to make an Italian-style coffee – short black (a single espresso shot) with more water (generally twice as much), resulting in a larger coffee, a ''lungo''. A normal serving of espresso takes from 18 to 30 seconds to pull, and fills 25 to 60 millilitres, while a lungo may take up to a minute to pull, and might fill 130 to 170 millilitres. Extraction time of the dose is determined by the variety of coffee beans (usually a blend of Arabica and Robusta), their grind and the pressure of the machine. It is usually brewed using an espresso machine but with two or three times the amount of water to the same weight of coffee to make a much longer drink. In French it is called . Related beverages A ''caffè lungo'' should not be mistaken for a ''caffè americano'' (an espresso with hot water added to it) or a long black (hot water with a short black added to it, which is the inverse order to an America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ristretto
Ristretto () is a "short shot" (30 ml from a double basket) of a more highly concentrated espresso coffee. It is made with the same amount of ground coffee, but extracted with a finer grind (also in from 20 to 30 seconds) using half as much water. A normal short shot might ''look like'' a ristretto, but in reality, would only be a weaker, more diluted, shot. The opposite of a ''ristretto'' (which means in Italian, "shortened, narrow") is a lungo ("long"), which is a double shot. The French call a ristretto a ''café serré''. Regardless of whether one uses a hand pressed machine or an automatic, a regular double shot is generally considered to be around 14–18 grams of ground coffee extracted into 60 ml (2 fl oz or two shot glasses). Thus, a "double ristretto" consumes the same amount of coffee beans but fills only a single shot glass. Coffee contains over a thousand aromatic compounds. A ristretto's chemical composition and taste differ from those of a full-leng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pour-over Coffee
Brewed coffee is made by pouring hot water onto ground coffee beans, then allowing to brew. There are several methods for doing this, including using a filter, a percolator, and a French press. Terms used for the resulting coffee often reflect the method used, such as drip brewed coffee, filtered coffee, pour-over coffee, immersion brewed coffee, or simply coffee. Water seeps through the ground coffee, absorbing its constituent chemical compounds, and then passes through a filter. The used coffee grounds are retained in the filter, while the brewed coffee is collected in a vessel such as a carafe or pot. History Paper coffee filters were invented in Germany by Melitta Bentz in 1908 and are commonly used for drip brew all over the world. In 1954 the Wigomat, invented by Gottlob Widmann, was patented in Germany being the first electrical drip brewer. Drip brew coffee makers replaced the coffee percolator in the 1970s due to the percolators' tendency to over-extract coffee, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coffee Percolator
A coffee percolator is a type of pot used for the brewing of coffee by continually cycling the boiling or nearly boiling brew through the grounds using gravity until the required strength is reached. Coffee percolators once enjoyed great popularity but were supplanted in the early 1970s by automatic drip coffee makers. Percolators often expose the grounds to higher temperatures than other brewing methods, and may recirculate already brewed coffee through the beans. As a result, coffee brewed with a percolator is particularly susceptible to overextraction. However, percolator enthusiasts maintain that the potential pitfalls of this brewing method can be eliminated by careful control of the brewing process. Brewing process A coffee percolator consists of a pot with a small chamber at the bottom which is nearest to the heat source. A removable vertical tube leads from there to the top of the percolator. Just below the upper end of this tube is a perforated "basket" to hold the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turkish Coffee
Turkish coffee is a style of coffee prepared in a ''cezve'' using very finely ground coffee beans without filtering. Preparation Turkish coffee is very finely ground coffee brewed by boiling. Any coffee bean may be used; arabica varieties are considered best, but robusta or a blend is also used. The coffee grounds are left in the coffee when served. The coffee may be ground at home in a manual grinder made for the very fine grind, ground to order by coffee merchants in most parts of the world, or bought ready-ground from many shops. Coffee and water, usually with added sugar, is brought to the boil in a special pot called ''cezve'' in Turkey, and often called ''ibrik'' elsewhere. As soon as the mixture begins to froth, and before it boils over, it is taken off the heat; it may be briefly reheated twice more to increase the desired froth. Sometimes about one-third of the coffee is distributed to individual cups; the remaining amount is returned to the fire and distributed to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vacuum Coffee Maker
A vacuum coffee maker brews coffee using two chambers where vapor pressure and gravity produce coffee. This type of coffee maker is also known as ''vac pot'', ''siphon'' or ''syphon coffee maker,'' and was invented by Loeff of Berlin in the 1830s. These devices have since been used for more than a century in many parts of the world. Design and composition of the vacuum coffee maker varies. The chamber material is borosilicate glass, metal, or plastic, and the filter can be either a glass rod or a screen made of metal, cloth, paper, or nylon. The Napier Vacuum Machine, presented in 1840, was an early example of this technique. While vacuum coffee makers generally were excessively complex for everyday use, they were prized for producing a clear brew, and were quite popular until the middle of the twentieth century. Vacuum coffee makers remain popular in some parts of Asia, including Japan and Taiwan. The Bauhaus interpretation of this device can be seen in Gerhard Marcks' Sintrax co ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coffee Cupping
Coffee cupping, or coffee tasting, is the practice of observing the tastes and aromas of brewed coffee. It is a professional practice but can be done informally by anyone or by professionals known as "Q Graders". A standard coffee cupping procedure involves deeply sniffing the coffee, then slurping the coffee from a spoon so it is aerated and spread across the tongue. The coffee taster attempts to measure aspects of the coffee's taste, specifically the ''body'' (the texture or mouthfeel, such as oiliness), ''sweetness'', ''acidity'' (a sharp and tangy feeling, like when biting into an orange), ''flavour'' (the characters in the cup), and aftertaste. Since coffee beans embody telltale flavours from the region where they were grown, cuppers may attempt to identify the coffee's origin. Aromas Various descriptions are used to note coffee aroma. *Animal-like – This odour descriptor is somewhat reminiscent of the smell of animals. It is not a fragrant aroma like musk but has the cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Total Dissolved Solids
Total dissolved solids (TDS) is a measure of the dissolved combined content of all inorganic and organic substances present in a liquid in molecular, ionized, or micro-granular ( colloidal sol) suspended form. TDS concentrations are often reported in parts per million (ppm). Water TDS concentrations can be determined using a digital meter. Generally, the operational definition is that the solids must be small enough to survive filtration through a filter with 2-micrometer (nominal size, or smaller) pores. Total dissolved solids are normally discussed only for freshwater systems, as salinity includes some of the ions constituting the definition of TDS. The principal application of TDS is in the study of water quality for streams, rivers, and lakes. Although TDS is not generally considered a primary pollutant (e.g. it is not deemed to be associated with health effects), it is used as an indication of aesthetic characteristics of drinking water and as an aggregate indicator of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caffeine
Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is mainly used recreationally as a cognitive enhancer, increasing alertness and attentional performance. Caffeine acts by blocking binding of adenosine to the adenosine A1 receptor, which enhances release of the neurotransmitter acetylcholine. Caffeine has a three-dimensional structure similar to that of adenosine, which allows it to bind and block its receptors. Caffeine also increases cyclic AMP levels through nonselective inhibition of phosphodiesterase. Caffeine is a bitter, white crystalline purine, a methylxanthine alkaloid, and is chemically related to the adenine and guanine bases of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is found in the seeds, fruits, nuts, or leaves of a number of plants native to Africa, East Asia and South America, and helps to protect them against herbivores and from competition by preventing the germination of nearby seeds, as well as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crema (coffee)
Espresso (, ) is a coffee-brewing method of Italian origin, in which a small amount of nearly boiling water (about ) is forced under of pressure through finely-ground coffee beans. Espresso can be made with a wide variety of coffee beans and roast degrees. Espresso is the most common way of making coffee in southern Europe, especially in Italy, France, Spain, and Portugal. It is also popular in Switzerland, Croatia, Bosnia and Herzegovina, Bulgaria, Greece, South Africa, the United Kingdom, the United States, Canada, Australia and New Zealand. Espresso is generally thicker than coffee brewed by other methods, with a viscosity similar to that of warm honey. This is due to the higher concentration of suspended and dissolved solids, and the ''crema'' on top (a foam with a creamy consistency). As a result of the pressurized brewing process, the flavors and chemicals in a typical cup of espresso are very concentrated. Espresso has more caffeine per unit volume than most coffee be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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