JP2016106607A - Coffee-containing beverage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make bitterness of coffee-containing beverage containing a coffee extract more mild.SOLUTION: The coffee-containing beverage contains a coffee extract. The coffee extract to which ultra pure water is added and whose Brix value is adjusted to 1.0, is configured so that, a ratio C/C×100 of quinic acid with respect to a total amount Cof contents of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid, is 46 mass% or less.SELECTED DRAWING: None

Description

  The present invention relates to a coffee-containing beverage.

  Various studies have been made on coffee-containing beverages containing a coffee extract from the viewpoint of improving the flavor, for example. Examples of such a technique include those described in Patent Documents 1 and 2.

  Patent Document 1 describes a method for producing a coffee extract including a step of obtaining an extract from lightly roasted coffee beans and a step of concentrating the extract at a temperature in the range of 50 to 90 ° C. Patent Document 2 includes (A) 0.01 to 1% by mass of chlorogenic acids, and (B) a total amount of monoaromatic polyphenols of 0.2 to 6 ppm in a beverage. Beverages are described.

JP 2011-62127 A JP 2009-28013 A

  For coffee-containing beverages containing coffee extract, it may be required to make the bitterness more mellow.

According to the present invention,
Including coffee extract,
The coffee extract with the Brix value adjusted to 1.0 by adding ultrapure water is composed of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid. coffee-containing beverage content _{C q} ratio _C q _{/ C total} × 100 of the quinic acid to the total _{C total} content is less than 46% by weight is provided.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to make bitterness of the coffee containing drink containing a coffee extract more gentle.

It is a flowchart which shows the manufacturing method of the coffee containing drink which concerns on this embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

The coffee-containing beverage according to the present embodiment includes a coffee extract. In addition, the coffee extract with the Brix value adjusted to 1.0 by adding ultrapure water is phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyro The ratio C _q / C _total × 100 of the quinic acid content C _q to the total C _total glutamic acid content is 46 wt% or less.

As described above, for coffee-containing beverages, it may be required to make the bitterness more mellow. The present inventor presumed that various organic acid components in the coffee extract contained in the coffee-containing beverage can affect the bitterness of the coffee-containing beverage. As a result of intensive studies, the content of quinic acid relative to the total C _total of the phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid content of the coffee extract by controlling the rate C _{q /} C _total × 100 of C _q, can be the bitterness of the coffee-containing beverage comprising the coffee extract more mellow is newly finding by the present inventors. The coffee-containing beverage according to the present embodiment controls C _q / C _total × 100 to 46% by weight or less based on such knowledge. Thereby, it becomes possible to realize a mellow bitterness about the coffee-containing beverage containing the coffee extract.

  Hereinafter, the coffee-containing beverage according to the present embodiment will be described in detail.

  As described above, the coffee-containing beverage contains a coffee extract. The coffee-containing beverage according to the present embodiment refers to a beverage containing at least a coffee extract. For this reason, regardless of the content of components other than the coffee extract such as milk, a beverage containing the coffee extract can be handled as a coffee-containing beverage.

  The coffee-containing beverage can be, for example, a container-packed coffee-containing beverage filled in a container. In this embodiment, a container-packed coffee-containing beverage is formed by, for example, filling a coffee-containing beverage in an airtight container. Examples of the sealed container include, but are not limited to, cans such as steel cans and aluminum cans, bottles such as glass bottles, paper containers, and retort pouches.

  The coffee extract is an extract extracted from roasted beans obtained by roasting coffee beans. Examples of green coffee beans include, but are not limited to, Mexico, Guatemala, Blue Mountain, Crystal Mountain, Costa Rica, Colombia, Venezuela, Brazil Santos, Hawaii Kona, Mocha, Kenya, Kilimanjaro, Mandelin, and Robusta. In this embodiment, a coffee extract can be prepared using, for example, green coffee beans containing one or more of these.

In the present embodiment, the coffee extract obtained by adding ultrapure water and adjusting the Brix value to 1.0 is phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and the content of quinic acid to the total _{C total} content of pyroglutamate _{C q} ratio _C q _{/ C total} × 100 of at most 46 wt%. Thereby, the bitterness of the coffee containing drink containing a coffee extract can be made milder. In the present embodiment, phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, and lactic acid in 100 ml of coffee extract adjusted to Brix value of 1.0 by adding ultrapure water. , Formic acid, acetic acid, and pyroglutamic acid can be summed as C _total (mg / 100 ml) and quinic acid can be regarded as C _q (mg / 100 ml).

As described above, the present inventor, in order to make the bitterness of the coffee-containing beverage more mellow, phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, Further, it was studied to control the ratio C _q / C _total × 100 of the quinic acid content C _q to the total C _total of pyroglutamic acid content. However, the numerical value of C _q / C _total × 100 tends to increase as the roasting degree of the roasted beans used progresses. That is, when roasted beans with a roasting degree sufficient to give an appropriate flavor to a coffee-containing beverage, the C _q / C _total × 100 of the coffee extract should be 46% by weight or less. Has been difficult so far.

As a result of intensive studies, the present inventor has shown that C _q / C _total × 100 can be reduced while using roasted beans with a sufficient degree of roasting by highly controlling the method of preparing the coffee extract. I found it. For example, freeze-drying green coffee beans, appropriately selecting freeze-drying conditions, adjusting the degree of roasting, etc., while maintaining a sufficient roasting degree to give an appropriate flavor It is considered to be an important factor for controlling C _q / C _total × 100 within a good range. In the present embodiment, a method for producing a coffee-containing beverage is appropriately controlled based on such knowledge, and a coffee-containing beverage containing a coffee extract with C _q / C _total × 100 of 46% by weight or less is realized. It is.

From the viewpoint of making the bitterness of the coffee-containing beverage more mellow, the C _q / C _total × 100 of the coffee extract is more preferably 42% by weight or less, and particularly preferably 40% by weight or less. On the other hand, C _q / C _total × 100 is preferably 20% by weight or more, more preferably 30% by weight or more, and particularly preferably 35% by weight or more. Thereby, the balance of the bitterness of a coffee containing drink, sourness, aftertaste, etc. can be improved more effectively.

In this embodiment, phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid in 100 ml of coffee extract adjusted to 1.0 Brix value by adding ultrapure water The total C _total of pyroglutamic acid content is not particularly limited, but is preferably 50 (mg / 100 ml) or more, more preferably 120 (mg / 100 ml) or more, and 128 (mg / 100 ml). 100 ml) or more is particularly preferable. The C _total is not particularly limited, but is preferably 200 (mg / 100 ml) or less, more preferably 170 (mg / 100 ml) or less, and 150 (mg / 100 ml) or less. Particularly preferred. Thereby, it becomes easier to set C _q / C _total × 100 within a desired range. For this reason, it becomes possible to contribute to the improvement of the balance of bitterness, acidity, aftertaste and the like of the coffee-containing beverage.

In the present embodiment, the content C _q of quinic acid in 100 ml of coffee extract obtained by adding ultrapure water and adjusting the Brix value to 1.0 is not particularly limited, but is, for example, 30 (mg / 100 ml) or more. Preferably, it is more preferably 40 (mg / 100 ml) or more, and particularly preferably 45 (mg / 100 ml) or more. The C _q is not particularly limited, but is preferably 90 (mg / 100 ml) or less, more preferably 75 (mg / 100 ml) or less, and 56 (mg / 100 ml) or less. Particularly preferred. Thereby, it becomes easier to set C _q / C _total × 100 within a desired range. For this reason, it becomes possible to contribute to the improvement of the balance of bitterness, acidity, aftertaste and the like of the coffee-containing beverage.

In the present embodiment, C _total and C _q of the coffee extract can be controlled, for example, by highly adjusting a method for producing the coffee extract. For example, lyophilization of green coffee beans, appropriate selection of freeze-drying conditions, adjustment of roasting degree, etc. are considered factors that can affect C _total and C _q. Yes.

C _total (mg / 100 ml) and C _q (mg / 100 ml) of the coffee extract can be obtained, for example, as follows. First, after adding ultrapure water to the coffee extract to adjust the Brix value to 1.0, a sample is obtained by filtering with a 0.45 μm disposable syringe filter. Next, the contents (mg / 100 ml) of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid in 100 ml of the sample were measured by HPLC (High Performance Liquid). (Chromatograph). For example, Prominence (Shimadzu Corporation) can be used as the HPLC. For example, an electrical conductivity detector can be used as the detector. The measurement conditions are set as follows, for example.
Column: Shim-pack SCR-102H (8 mm × 300 mm, 7 μm) (Shimadzu Corporation)
Guard column: Shim-pack SCR-102H (6 mm × 50 mm, 7 μm) (Shimadzu Corporation)
Column oven temperature: 50 ° C
Mobile phase: p-toluenesulfonic acid aqueous solution (5 mmol / L)
Detection solution: Bis-Tris aqueous solution (20 mmol / L) containing p-toluenesulfonic acid (5 mmol / L) and EDTA (100 μmol / L)
Pump flow rate (mobile phase): 0.8 ml / min
Pump flow rate (detection liquid): 0.8ml / min
Injection volume: 10 μl
Polarity: +
Cell temperature: The content C _q (mg / 100 ml) of quinic acid in 100 ml of the sample is obtained from the automatically set measurement result. From the measurement results of the contents of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid in 100 ml of the sample, phosphoric acid in 100 ml of the sample was obtained. The total C _total (mg / 100 ml) of the contents of citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid is calculated.

  More preferably, the coffee extract contained in the coffee-containing beverage according to the present embodiment contains, for example, phosphoric acid, citric acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid. Thereby, the adjustment of the balance of the bitterness of a coffee containing drink, aftertaste, and sourness can be made easier. Moreover, although the coffee extract may contain pyruvic acid, it does not need to contain it. The fact that pyruvic acid is not contained in the coffee extract means, for example, that the content of pyruvic acid in 100 ml of coffee extract obtained by adding ultrapure water and adjusting the Brix value to 1.0 is 0.01 (mg / 100 ml) This is the case.

In the present embodiment, the ratio C ₂ / C ₁ of the caffeine content C _{2 to} the chlorogenic acid content C ₁ in the coffee extract obtained by adding ultrapure water and adjusting the Brix value to 1.0 is, for example, It can be 2.0 or more. In the present embodiment, the content of chlorogenic acid is C ₁ (mg / 100 ml) in 100 ml of coffee extract obtained by adding ultrapure water and adjusting the Brix value to 1.0, and the content of caffeine. Can be C ₂ (mg / 100 ml).

In the coffee extract, as the roasting degree of the roasted beans used advances, the caffeine content C ₂ tends to increase and the chlorogenic acid content C ₁ tends to decrease. Thus, C 2 _/ C ₁ can be used as an index indicating the roasting degree of roasted beans used in the preparation of coffee extract. The present inventor has found that C ₂ / C ₁ is 2.0 or more when roasted beans roasted to such an extent that a good flavor can be imparted to the coffee-containing beverage. Therefore, more by making the C _{2 /} C ₁ of the coffee extract 2.0 or more, it is possible to realize a coffee-containing beverage having good flavor.

By setting C ₂ / C ₁ of the coffee extract to, for example, 2.0 or more and less than 3.5, a coffee extract having a strong taste and rich acidity can be obtained. In addition, by setting C ₂ / C ₁ of the obtained coffee extract to, for example, 3.5 or more and less than 10.0, it is possible to realize a thick taste while having a strong and sour taste. . In addition, by setting C ₂ / C ₁ of the obtained coffee extract to, for example, 10.0 or more, a coffee extract that is easy to drink can be obtained. Incidentally, while suppressing the burnt sense, from the viewpoint of realizing easy and clean drinking taste, for example, the C _{2 /} C ₁ of coffee extract preferably set to 20.0 or less.

In the present embodiment, as described above, C ₂ / C ₁ of the coffee extract can be set to 10.0 or more. Thus, even when roasted beans having a relatively high degree of roasting are used, according to this embodiment, C _q / C _total × 100 can be set to 46% by weight or less. For this reason, it becomes possible to realize a coffee-containing beverage that has a good flavor and is easy to drink while mildly bitter.

In the present embodiment, the C _{2 /} C ₁ of a coffee extract as described above may be less than 2 to 10. Thus, when roasted beans with a low roasting degree are used as compared with the case where C ₂ / C ₁ is 10.0 or more, C _q / C _total × 100 is as low as 42% by weight or less. It becomes easier to set the value range. For this reason, it becomes possible to contribute to making the bitterness of a coffee-containing drink more mellow.

In the present embodiment, the content _{C 1} of chlorogenic acid in the coffee extract 100ml adjusted ultrapure water was added Brix value of 1.0 is not particularly limited, for example, 1 (mg / 100ml) over Preferably, it is 5 (mg / 100 ml) or more. Furthermore, the _{C 1} is not particularly limited, is preferably from e.g. 30 (mg / 100ml), and more preferably less 25 (mg / 100ml). This makes it easier to the C 2 _/ C ₁ and within a desired range.

In the present embodiment, the content _{C 2} of caffeine coffee extract 100ml adjusted ultrapure water was added Brix value of 1.0 is not particularly limited, for example, 20 (mg / 100ml) over It is preferable that it is 30 (mg / 100 ml) or more. Also, the _{C 2} is not particularly limited, is preferably for example at 60 (mg / 100ml) or less, and more preferably less 55 (mg / 100ml). This makes it easier to the C 2 _/ C ₁ and within a desired range.

In the present embodiment, C ₂ / C ₁ can be controlled by appropriately adjusting a method for producing a coffee extract, for example, adjusting a roasting degree when roasting coffee beans. . Further, in the present embodiment, as described above, even when roasted beans roasted so that C ₂ / C ₁ falls within the numerical range described above, the green coffee beans are frozen. C _q / C _total × 100 can be controlled within a favorable range by highly controlling the method of preparing the coffee extract, such as drying.

The chlorogenic acid content C ₁ (mg / 100 ml) and the caffeine content C ₂ (mg / 100 ml) of the coffee extract can be measured, for example, as follows. First, after adding ultrapure water to the coffee extract to adjust the Brix value to 1.0, a sample is obtained by filtering at 1000 rpm for 30 minutes with an ultrafiltration filter unit. Subsequently, the caffeine content C ₂ (mg / 100 ml) and the chlorogenic acid content C ₁ (mg / 100 ml) in the 100 ml sample are measured using UHPLC (Ultra High Performance Liquid Chromatography). As UHPLC, for example, Nexera (Shimadzu Corporation) can be used. As the detector, for example, a PDA (Photodiode Array Detector) detector can be used. The measurement conditions are set as follows, for example.
Column: ZORBAX Eclipse Plus C18 (Agilent Technology Co., Ltd.)
Column oven temperature: 45 ° C
Mobile phase A liquid: ultrapure water containing 0.17% phosphoric acid Mobile phase B liquid: methanol pump containing 0.17% phosphoric acid Flow rate: 1.2 ml / min
Injection volume: 3 μl
Cell temperature control temperature: 40 ° C

  The content of the coffee extract with respect to the entire coffee-containing beverage is, for example, preferably 20% by weight or more, and more preferably 30% by weight or more. Thereby, it can contribute to the flavor improvement in a coffee containing drink. On the other hand, the content of the coffee extract with respect to the entire coffee-containing beverage can be, for example, 100% by weight or less, and can be 98% by weight or less when other additives are included. When the coffee-containing beverage is black coffee, for example, the content of the coffee extract with respect to the entire coffee-containing beverage can be 80% by weight or more and 98% by weight or less. When the coffee-containing beverage is milk-containing coffee, for example, the content of the coffee extract with respect to the entire coffee-containing beverage can be 20 wt% or more and 80 wt% or less.

  The coffee-containing beverage may contain an additive other than the coffee extract. The said other additive can contain the 1 type (s) or 2 or more types selected from a sweetening component, a flavor component, a milk component, an emulsifier, a stabilizer, an antioxidant, and a pH adjuster, for example.

  The sweetening component can include one or more selected from sugars such as sugar, sugar alcohols such as maltitol and erythritol, and high-intensity sweeteners such as aspartame, acesulfame potassium, sucralose, and stevia. . A flavor component can contain the 1 type, or 2 or more types selected from a fragrance | flavor, an extract, etc., for example. The milk component can include, for example, one or more selected from cow's milk, raw milk, skim milk, partially skim milk, fresh cream, concentrated milk, condensed milk, whole milk powder, skim milk powder, and the like. The emulsifier can contain, for example, one or more selected from glycerin fatty acid ester, sucrose fatty acid ester, sorbitan fatty acid ester, propylene glycol fatty acid ester, yucca extract, saponin, lecithin, polysorbate and the like. Stabilizers can include, for example, sodium caseinate and the like. The antioxidant can include one or more selected from, for example, ascorbic acid, sodium ascorbate, and sodium erythorbate. The pH adjuster can contain one or more selected from, for example, potassium carbonate, sodium bicarbonate, potassium hydroxide, dipotassium hydrogen phosphate, sodium dihydrogen phosphate, and disodium hydrogen phosphate. In addition, in the coffee-containing beverages, addition of food additives such as various nutritional components, extracts, various extracts, acidulants, colorants, and diluents, basic amino acids, citric acid, etc. One or two or more components selected from additives that give a function and additives related to the taste of coffee such as caffeine may be further included.

  Next, the manufacturing method of the coffee containing drink which concerns on this embodiment is demonstrated.

FIG. 1 is a flowchart showing a method for producing a coffee-containing beverage according to this embodiment.
First, green coffee beans are freeze-dried (S1). Green coffee beans are coffee beans that have not been roasted. In the present embodiment, for example, green coffee beans having a moisture content of 9% by weight to 15% by weight can be freeze-dried. In addition, the moisture content of green coffee beans refers to the ratio (% by weight) of the amount of water to the whole green coffee beans. The moisture content of green coffee beans that have not been freeze-dried can be measured using, for example, a cereal moisture meter.

In the present embodiment, for example, by extracting a coffee extract from roasted beans obtained by roasting freeze-dried green coffee beans, a value of C _q / C _total × 100 of the coffee extract is desired. It is thought that it can be within the range of. This is considered to be due to reducing the water content of green coffee beans just before roasting by freeze drying. Since the moisture content can be reduced while suppressing morphological changes and deterioration of cells in green coffee beans by freeze-drying, the porous structure in roasted beans obtained by subsequent roasting (hereinafter also referred to as honeycomb structure) It is speculated that this affects the contents of various organic acids in the coffee extract and the numerical value of C _q / C _total × 100.

The green coffee beans can be lyophilized, for example, so that the moisture content of the green coffee beans is less than 9% by weight. Thereby, it becomes easier to set the numerical value of C _q / C _total × 100 of the coffee extract within a desired range. In the present embodiment, the green coffee beans can be freeze-dried so that the moisture content of the green coffee beans is preferably 6% by weight or less, more preferably 5.5% by weight or less.

The water content of green coffee beans after lyophilization can be calculated, for example, as follows. First, the difference (W _a −W _b ) between the weight W _a (g) of the coffee beans before lyophilization and the weight W _b (g) after lyophilization is calculated as the amount of dehydration. Next, a value obtained by subtracting the dehydration amount from the water content W _c (g) of the green coffee beans before lyophilization is obtained as the water content W _d (g) of the green coffee beans after lyophilization. Then, (W _d / W _b ) × 100 (% by weight) is calculated as the moisture content of green coffee beans after lyophilization.

  The various conditions for freeze-drying can be appropriately selected according to the moisture content of the green coffee beans after freeze-drying required. The freeze-drying in the present embodiment is performed by, for example, pre-freezing the whole bean-like coffee beans at a temperature of −40 ° C. or more and −20 ° C. or less, and then at a temperature of 40 ° C. or more and 80 ° C. or less and a vacuum degree of 40 Pa It can be performed by drying under conditions of 610 Pa or less.

  Next, the freeze-dried green coffee beans are roasted (S2). Thereby, roasted beans are produced. In the present embodiment, since the green coffee beans that have been freeze-dried to reduce the water content as described above are used, it is possible to shorten the roasting time. For roasting coffee beans, for example, after the coffee beans are freeze-dried, the moisture content of the coffee beans is kept below 9% by weight, preferably 6% by weight or less, more preferably 5.5% by weight or less. Can be done in the state.

  The roasting conditions can be changed as appropriate according to the desired degree of roasting. For example, it is possible to control the degree of roasting of roasted beans by adjusting the temperature profile, roasting time, etc. inside the roasting machine. In the present embodiment, for example, roasted beans roasted to any roasting degree of shallow roast, medium roast, and deep roast can be produced. Moreover, L value measured with the color difference meter which shows the roasting degree of roasted beans can be made into 15.0 or more and 27.0 or less, for example.

Next, a coffee extract is extracted from the roasted beans (S3).
The coffee extract can be extracted, for example, by immersing a pulverized product obtained by pulverizing the roasted beans obtained above in a solvent containing water as a main component. Although it does not specifically limit as a solvent, For example, mineral water, tap water, distilled water, and deep sea water can be used. The grinding conditions for roasted beans are not particularly limited, and can be appropriately selected depending on the extraction method and the like. In addition, it is more preferable to extract the coffee extract using the pulverized product immediately after pulverization from the viewpoint of improving the flavor of the obtained coffee-containing beverage.

  The extraction method is not particularly limited, and for example, a drip extraction method, an immersion extraction method, a column extraction method, and an espresso extraction method can be used. As an example of a method for producing a coffee extract in the present embodiment, a pulverized product obtained by finely grinding roasted beans is subjected to drip extraction with a solvent containing water at a temperature of 50 ° C. or higher and 100 ° C. or lower as a main component. The method of obtaining a coffee extract is mentioned.

In the extraction step (S3), when the weight of the roasted beans used is W ₁ (g) and the weight of the coffee extract obtained using the roasted beans is W ₂ (g), W ₂ / W ₁ is preferably 5 or more and 30 or less. This makes it possible to suppress the amount of miscellaneous components while efficiently extracting the taste of coffee. Moreover, it is preferable that the Brix value measured using the saccharimeter of the coffee extract obtained is 1.0 or more, and more preferably 1.3 or more. Thereby, the flavor of coffee can be improved efficiently.

  Next, the coffee extract is mixed with other additives (S4). Thereby, the coffee containing drink containing a coffee extract and another additive is obtained. In addition, in this embodiment, you may handle a coffee extract simple substance as a coffee containing drink, without adding the said other additive.

Next, the coffee-containing beverage containing the coffee extract is filled in the container (S5). Thereby, a container-packed coffee-containing beverage is obtained. In the present embodiment, for example, retort sterilization can be performed on a container-packed coffee-containing beverage obtained by filling a container with a coffee-containing beverage. Retort sterilization can be performed, for example, under conditions of 120 ° C. or more and 140 ° C. or less and 5 minutes or more and 30 minutes or less. Thereafter, the container-packed coffee beverage sterilized in this way is provided as a product.
The method for producing a coffee-containing beverage according to the present embodiment is performed in this manner, for example.

  It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  Next, examples of the present invention will be described.

(Preparation of coffee extract)
About each Example, the coffee extract was produced as follows. First, green coffee beans having a moisture content of 13% by weight were freeze-dried so that the moisture content was 5.2% by weight. Freeze-drying is a condition of a temperature of 40 ° C. or more and 80 ° C. or less and a degree of vacuum of 40 Pa or more and 610 Pa or less after pre-freezing the whole bean-like coffee beans under a temperature of −40 ° C. or more and −20 ° C. And dried.

The water content of the green coffee beans after lyophilization was calculated as follows. First, the difference (W _a −W _b ) between the weight W _a (g) before lyophilization of green coffee beans and the weight W _b (g) after lyophilization was calculated as the amount of dehydration. Next, a value obtained by subtracting the dehydration amount from the water content W _c (g) of green coffee beans before freeze-drying was determined as the water content W _d (g) of green coffee beans after freeze-drying. Then, (W _d / W _b ) × 100 (% by weight) was calculated as the moisture content of green coffee beans after lyophilization.

  Next, the green coffee beans after lyophilization were roasted to the L value shown in Table 1 to obtain roasted beans. Next, about 450 g of coffee extract was extracted from 30 g of roasted beans. Extraction was performed by crushing the roasted beans obtained above and then drip extraction with warm water at 97 ° C. A coffee extract was thus obtained.

  For Comparative Example 1, a coffee extract was prepared in the same manner as in each Example except that lyophilization was not performed. In addition, in preparation of the coffee extract which concerns on the comparative example 1, the moisture content of the green coffee beans before roasting was 9 weight% or more.

(Component analysis of coffee extract 1)
For each Example and Comparative Example 1, the contents of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid in the obtained coffee extract were as follows: And analyzed. First, after adding ultrapure water to the coffee extract to adjust the Brix value to 1.0, a sample was obtained by filtering with a 0.45 μm disposable syringe filter (Mixed Cellulose Ester). Next, the contents (mg / 100 ml) of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid in 100 ml of the sample were measured by HPLC (Prominence (( Shimadzu Corporation), detector: electrical conductivity, post column), and the following conditions.
Column: Shim-pack SCR-102H (8 mm × 300 mm, 7 μm) (Shimadzu Corporation)
Guard column: Shim-pack SCR-102H (6 mm × 50 mm, 7 μm) (Shimadzu Corporation)
Column oven temperature: 50 ° C
Mobile phase: p-toluenesulfonic acid aqueous solution (5 mmol / L)
Detection solution: Bis-Tris aqueous solution (20 mmol / L) containing p-toluenesulfonic acid (5 mmol / L) and EDTA (100 μmol / L)
Pump flow rate (mobile phase): 0.8 ml / min
Pump flow rate (detection liquid): 0.8ml / min
Injection volume: 10 μl
Polarity: +
Cell temperature: From the measured values obtained automatically, the total content of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid C _total (mg / 100 ml ) And the ratio C _q / C _total × 100 (% by weight) of the quinic acid content C _q (mg / 100 ml) with respect to the C _total . The results are shown in Table 2.

  From the results of the component analysis 1 of the coffee extract, for each Example and Comparative Example 1, phosphoric acid, citric acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid were obtained. Was confirmed to be included. On the other hand, for each Example and Comparative Example 1, it was also confirmed that the content of pyruvic acid in 100 ml of the obtained sample was less than 0.01 (mg / 100 ml).

(Component analysis of coffee extract 2)
About each Example and the comparative example 1, content of caffeine and chlorogenic acid of the obtained coffee extract was analyzed as follows. First, after adding ultrapure water to the coffee extract to adjust the Brix value to 1.0, a sample was obtained by filtering at 1000 rpm for 30 minutes with an ultrafiltration filter unit (Amicon Ultra). . Next, the caffeine content C ₂ (mg / 100 ml) and the chlorogenic acid content C ₁ (mg / 100 ml) in 100 ml of the sample were measured by UHPLC (Nexera (Shimadzu Corporation), detector: PDA). Was measured under the following conditions.
Column: ZORBAX Eclipse Plus C18 (Agilent Technology Co., Ltd.)
Column oven temperature: 45 ° C
Mobile phase A liquid: ultrapure water containing 0.17% phosphoric acid Mobile phase B liquid: methanol pump containing 0.17% phosphoric acid Flow rate: 1.2 ml / min
Injection volume: 3 μl
Cell temperature control temperature: 40 ° C
From the obtained measured value, the ratio C ₂ / C ₁ of the content C ₂ of caffeine to the content C ₁ of chlorogenic acid was calculated. The results are shown in Table 2.

(Production of coffee-containing beverage)
About each Example and the comparative example 1, the coffee containing drink was produced as follows. First, 100 parts by weight of the coffee extract obtained above, 10 parts by weight of granulated sugar, 22 parts by weight of milk, 0.15 parts by weight of an emulsifier, and 0.25 parts by weight of baking soda were mixed. The coffee-containing beverage thus obtained was filled into a can which is a sealed container. Next, retort sterilization was performed at 124 ° C. for 17 minutes. This produced the container-packed coffee containing drink.

(Evaluation of bitterness)
For each of Examples and Comparative Example 1, 7 panel members gave a score on 5 levels (5 is the best) as to whether the bitterness of the coffee-containing beverage obtained above was mellow, and the average Points were calculated. As a result, the coffee-containing beverages according to Examples 1 to 3 all had higher numerical values than Comparative Example 1. From this result, it can be seen that the softness of the bitterness of the coffee-containing beverage can be improved with respect to the coffee-containing beverage using the coffee extract having a C _q / C _total × 100 of 46% by mass or less.

Claims (5)

Including coffee extract,
The coffee extract with the Brix value adjusted to 1.0 by adding ultrapure water is composed of phosphoric acid, citric acid, pyruvic acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid. the content of total _C content ratio of _{C q} of quinic acid to _{total C} q _{/ C total} × 100 is 46 wt% or less is coffee-containing drink. The coffee-containing beverage according to claim 1,
The coffee extract was adjusted Brix value by adding ultra pure water to 1.0, the ratio _C 2 / _{C 1} of the content _{C 2} of caffeine to the content _{C 1} of chlorogenic acid 10.0 or more A coffee-containing beverage. The coffee-containing beverage according to claim 1,
C _q / C _total × 100 is 42% by weight or less,
The coffee extract was adjusted Brix value by adding ultra pure water to 1.0, the ratio _C 2 / _{C 1} caffeine content _{C 2} is 2.0 or more with respect to the content _{C 1} of chlorogenic acid 10 A coffee-containing beverage that is less than 0.0. In the coffee-containing beverage according to any one of claims 1 to 3,
The coffee extract is a coffee-containing beverage containing phosphoric acid, citric acid, malic acid, quinic acid, succinic acid, lactic acid, formic acid, acetic acid, and pyroglutamic acid. In the coffee-containing beverage according to any one of claims 1 to 4,
A coffee-containing beverage filled in a container.

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