JP2004329187A - Reducing coffee and method for producing the same - Google Patents

Reducing coffee and method for producing the same Download PDF

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Publication number
JP2004329187A
JP2004329187A JP2003162954A JP2003162954A JP2004329187A JP 2004329187 A JP2004329187 A JP 2004329187A JP 2003162954 A JP2003162954 A JP 2003162954A JP 2003162954 A JP2003162954 A JP 2003162954A JP 2004329187 A JP2004329187 A JP 2004329187A
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Japan
Prior art keywords
coffee
hydrogen gas
reducing
normal pressure
reduction potential
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JP2003162954A
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Japanese (ja)
Inventor
Wataru Murota
渉 室田
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Abstract

<P>PROBLEM TO BE SOLVED: To provide reducing coffee economically producible with a small-sized production apparatus and having low oxidation-reduction potential and extremely strong reducing properties. <P>SOLUTION: The reducing coffee is obtained by dissolving hydrogen gas at -180 to 90°C in coffee applying pressure of 0.1-500 atm and then returning the product to atmospheric pressure. Since the reducing coffee has extremely low reducing properties, the coffee causes no health problem and can be daily taken as reducing coffee. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明が属する技術分野】
この出願の発明は、新規なコーヒー及びその製造方法に関する。更に詳しくは、この出願の発明は、水素含有コーヒーに関しpHが9.0以下でありながら酸化還元電位の低い新規な水素含有コーヒー及びその製造方法に関する。
【0002】
【従来の技術】
従来から、生活習慣的にコーヒーを飲用するものであるが、そのコーヒーを酸化還元という立場から検証する考え方はない。通常いろいろな方法でコーヒーを飲用し、日常の生活の中に取り入れているのであるが、その摂取するコーヒーの酸化還元電位を問題視し、コーヒーに還元性を持たせようとする考え方はない。
【0003】
【発明が解決しようとする課題】
そこで、発明者は、還元性のコーヒーを得るべくいろいろな実験を重ねた結果、コーヒーに加圧下で常温ないし冷却した水素ガスを平衡状態となるまで溶解させ、この状態で加圧圧力を取り除いて常圧に戻すと、コーヒーに溶解していた水素ガスの一部分が気化するとはいえ、通常の溶解度の数倍ないし数千倍近い水素ガスが溶解していること、この溶解した水素ガスはほとんど気化することなく安定して溶解しているため、非常に低い酸化還元電位を有することを見出し、本願発明を完成するに至ったのである。
【0004】
すなわち、本発明は、十分な還元性を有するコーヒー及びその製造方法を提供することを目的とする。本発明のかかる目的は以下の構成により達成し得る。
【0005】
本発明の一態様によれば、常圧下で酸化還元電位が−50mv以下のコーヒーが提供される。この還元性のコーヒーはこれまでに飲用に供されてきたコーヒーと違い、十分に低い−50mv以下の酸化還元電位を有しているため、何らの健康問題を引き起こすこともなく、還元性のコーヒーとして日常的に摂取することができることになる。
【0006】
また、本発明の別の態様によれば、コーヒーに−180℃〜90℃の水素ガスを0.1気圧〜500気圧に加圧して溶解せしめ、常圧に戻すことにより得られた還元性のコーヒー及びその製造方法が提供される。
【0007】
また、かかる態様においては、pHが9.0以下において酸化還元電位が−50mv以下の還元性のコーヒーを提供することが可能となる。
【0008】
なお、本発明における還元性のコーヒーの製造に際し、水素ガスの温度の上限を90℃としたのは、水素ガスは通常水素ガスボンベ内に入れられて供給されるが、室外に放置されていた水素ガスボンベの温度が太陽光により90℃となることはよくあることであり、この程度の水素ガスでも十分にコーヒーに溶解させることができるが、あまり温度が高いものではコーヒーの温度の著しい上昇につながって溶解度が減少するので好ましくないためである。水素ガスの温度の下限を−180℃としたのは、水素ガスは−253℃以下に冷却された液体水素の形で供給される場合もあるが、この液体水素を気化させてコーヒーに溶解させる際、もとのコーヒーの温度、水素ガスの供給圧力及び流量にも依存するが、実験的にコーヒーが凝固しないように溶解させ得る温度を確認して限定したものである。しかしながら、得られる還元性のコーヒーは最終的には常圧に戻されるものであるから、経済性及びエネルギー効率の観点からは、液体水素の有する低温を他の目的に利用して、コーヒーに溶解させる際の水素温度は0℃以上となしたほうがよい。
【0009】
なお、コーヒーに水素ガスを溶解させる際の圧力は0.1気圧〜500気圧(ゲージ圧)とする。圧力が高ければ高いほどコーヒーに溶解する水素ガス量は多くなるが、得られる還元性のコーヒーは最終的には常圧に戻されるものであるから、あまり圧力が高くても常圧に戻した際に気化してしまう水素量が多くなるために経済的及びエネルギー的には無駄になる。好ましくは0.1気圧〜10気圧、更に好ましくは1気圧〜6気圧が使用される。
【0010】
このとき、コーヒーへの水素ガスの溶解割合は、水素ガスを溶解させた際の温度及び圧力により変化するが、常圧に戻した際に約0.001〜0.5wt%程度が安定して溶解している。常圧下における水素ガスのコーヒーへの溶解度は約2ml/100ml(約1.8×10−4wt%)であるから、本発明で得られる還元性のコーヒー中の水素ガス量は単に常圧下で水素ガスを溶解させた場合と比すると約5〜2500倍もの水素ガスが溶解していることになる。
【0011】
このように多量の水素ガスが安定的にコーヒー中に溶解していることの理由は、水素ガスの一部分は過飽和状態で溶解していると考えることはできるが、それだけでは溶解水素ガス量が多すぎるために説明ができない。詳細な理由は今後の研究に待つ必要はあるが、本発明者は以下のような現象が生じているものと推定した。
【0012】
すなわち、常圧下でコーヒーに水素ガスを溶解させても、通常は何らの反応も生じない。しかしながら、加圧下で水素ガスをコーヒーに溶解させるとコーヒー中の酸素原子と水素ガスの水素原子とが近づき、両者間に水素結合が生じ、そのため、加圧下では水素ガスは従来予測されているよりも多量に溶解する。この一端生成した水素結合は常圧に戻しても幾分かは安定状態で残っているため、常圧下でも予測数量よりも数倍〜数千倍もの水素ガスが安定的に溶解しているものと推定される。
【0013】
本発明における還元性のコーヒーの製造にあたっては、周知の気液接触装置を使用することができ、バッチ式であっても連続流通式であっても適宜使用し得る。高圧で水素ガスを吸収させたコーヒーを常圧に戻したときに気化した水素ガスは、当然に回収して再利用することができる。以下、本発明の具体例により詳細に説明する。
【0014】
【発明の実施の形態】
(実施例)
まず、水素ガスを溶解させる前のコーヒーのpH及び酸化還元電位を測定した。その結果を表にまとめて示した。
【0015】
実施例として80℃に熱したコーヒーに常温の水素ガスを入口圧力6気圧、出口圧力0.2気圧となるように調整し、気液接触装置を用い、計1リットルを200ml/分の割合で5分間流した。その後得られた還元性のコーヒーを50℃常圧下に保持し、酸化還元電位及びpHを測定した。その結果をまとめて表に示した。
【0016】
【表1】

Figure 2004329187
この表の結果から、本発明の還元性のコーヒーはpHが変化しないにもかかわらず酸化還元電位が−510mvと非常に低い還元性を示しているのがわかる。
【0017】
【表2】
Figure 2004329187
この表2の結果によれば、本発明に従って得られた還元性のコーヒーを密閉容器内に保存すると徐々に酸化還元電位の値が低下して約24時間〜48時間後に極小値をとった後、徐々に上降する傾向がみられた。特にこのような電位変化が生じる理由については現在のところまだ解明されていないが、後半の酸化還元電位の上昇については容器内への周囲空気の進入の影響も考えられなくないので、別途、密閉容器を開放した場合の酸化還元電位の経時変化を確認することとした。
【0018】
表1における酸化還元電位−510mvのコーヒーを室温下に放置し、経過時間と酸化還元電位及びpHの関係を測定した。その結果をまとめて表3に示す。
【0019】
【表3】
Figure 2004329187
この表3の結果によれば、本発明に従って得られた還元性のコーヒーは開放容器にて保存するとpHに変化を及ぼさずに、酸化還元電位のみ上昇することがわかる。以上の表から推測するとコーヒー中に溶解していた水素ガスが気化してしまうというよりも、空気中の酸素が溶け込むことにより酸化還元電位が上昇すると考えられる。
【0020】
【発明の効果】
以上述べたように、本発明によれば、常圧下で酸化還元電位が非常に低いコーヒーが得られるので、何ら健康問題を引き起こすことなく、日常的に摂取することができるようになる。[0001]
TECHNICAL FIELD OF THE INVENTION
The invention of this application relates to a novel coffee and a method for producing the same. More specifically, the invention of this application relates to a novel hydrogen-containing coffee having a low oxidation-reduction potential at a pH of 9.0 or less and a method for producing the same.
[0002]
[Prior art]
Conventionally, coffee is consumed on a daily basis, but there is no idea to verify the coffee from the viewpoint of redox. Usually, people drink coffee in various ways and incorporate it into their daily lives. However, there is no idea that the oxidation-reduction potential of the coffee to be consumed is regarded as a problem and that the coffee is made reducible.
[0003]
[Problems to be solved by the invention]
Therefore, the inventor repeated experiments to obtain reducing coffee, and as a result, dissolved hydrogen gas at room temperature or cooled under pressure to an equilibrium state in the coffee under pressure, and removed the pressurized pressure in this state. When the pressure is returned to normal pressure, part of the hydrogen gas dissolved in the coffee vaporizes, but hydrogen gas that is several times to several thousand times closer to the normal solubility is dissolved, and this dissolved hydrogen gas is almost vaporized They discovered that they had a very low oxidation-reduction potential because they were dissolved stably without performing the process, and completed the present invention.
[0004]
That is, an object of the present invention is to provide coffee having a sufficient reducing property and a method for producing the same. Such an object of the present invention can be achieved by the following configurations.
[0005]
According to one aspect of the present invention, there is provided coffee having a redox potential of -50 mv or less under normal pressure. Unlike coffee that has been used for drinking, this reducing coffee has a sufficiently low oxidation-reduction potential of -50 mv or less, so that it does not cause any health problems and can be used as a reducing coffee. It can be taken on a daily basis.
[0006]
Further, according to another aspect of the present invention, a reducing gas obtained by dissolving hydrogen gas at −180 ° C. to 90 ° C. to coffee at a pressure of 0.1 to 500 atm and returning to normal pressure according to another aspect of the present invention. A coffee and a method for making the same are provided.
[0007]
Further, in such an embodiment, it is possible to provide a reducing coffee having an oxidation-reduction potential of −50 mv or less at a pH of 9.0 or less.
[0008]
In the production of reducing coffee according to the present invention, the upper limit of the temperature of the hydrogen gas is set to 90 ° C. because the hydrogen gas is usually supplied in a hydrogen gas cylinder but supplied outside the room. It is common for the temperature of a gas cylinder to reach 90 ° C due to sunlight, and this level of hydrogen gas can be sufficiently dissolved in coffee. However, if the temperature is too high, the temperature of the coffee rises significantly. This is undesirable because the solubility decreases. The lower limit of the temperature of the hydrogen gas is set to −180 ° C. The hydrogen gas may be supplied in the form of liquid hydrogen cooled to −253 ° C. or less, but this liquid hydrogen is vaporized and dissolved in coffee. In this case, the temperature depends on the temperature of the original coffee and the supply pressure and the flow rate of the hydrogen gas. However, since the resulting reducible coffee is finally returned to normal pressure, from the viewpoint of economy and energy efficiency, the low temperature of liquid hydrogen is used for other purposes to dissolve the coffee in coffee. The hydrogen temperature at this time is preferably set to 0 ° C. or higher.
[0009]
The pressure at which the hydrogen gas is dissolved in the coffee is from 0.1 atm to 500 atm (gauge pressure). The higher the pressure, the greater the amount of hydrogen gas that dissolves in the coffee, but the resulting reducible coffee is ultimately returned to normal pressure. Since the amount of hydrogen that evaporates at the time increases, it is wasteful economically and energy. Preferably 0.1 to 10 atm, more preferably 1 to 6 atm is used.
[0010]
At this time, the dissolution ratio of the hydrogen gas in the coffee varies depending on the temperature and the pressure when the hydrogen gas is dissolved, but when the pressure is returned to the normal pressure, about 0.001 to 0.5 wt% is stable. Is dissolved. Since the solubility of hydrogen gas in coffee under normal pressure is about 2 ml / 100 ml (about 1.8 × 10 −4 wt%), the amount of hydrogen gas in the reducible coffee obtained in the present invention is simply hydrogen under normal pressure. About 5 to 2500 times as much hydrogen gas is dissolved as when the gas is dissolved.
[0011]
The reason that such a large amount of hydrogen gas is stably dissolved in coffee can be considered to be that a part of the hydrogen gas is dissolved in a supersaturated state. I can't explain it because it's too much. Although the detailed reason needs to wait for future research, the present inventor has estimated that the following phenomena have occurred.
[0012]
That is, even when hydrogen gas is dissolved in coffee under normal pressure, no reaction usually occurs. However, when hydrogen gas is dissolved in coffee under pressure, the oxygen atoms in the coffee and the hydrogen atoms in the hydrogen gas approach each other, and a hydrogen bond occurs between the two. Also dissolves in large quantities. Even if the hydrogen bond generated at one end is returned to normal pressure, it remains in a stable state to some extent, so even under normal pressure, hydrogen gas is dissolved several times to several thousand times more than expected quantity under normal pressure. It is estimated to be.
[0013]
In the production of reducing coffee in the present invention, a well-known gas-liquid contact device can be used, and a batch type or a continuous flow type can be used as appropriate. The hydrogen gas vaporized when the coffee having absorbed the hydrogen gas at a high pressure is returned to normal pressure can be naturally collected and reused. Hereinafter, a specific example of the present invention will be described in detail.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
(Example)
First, the pH and oxidation-reduction potential of coffee before dissolving hydrogen gas were measured. The results are summarized in a table.
[0015]
As an example, normal temperature hydrogen gas was adjusted to coffee heated to 80 ° C. so as to have an inlet pressure of 6 atm and an outlet pressure of 0.2 atm. Run for 5 minutes. Thereafter, the obtained reducing coffee was kept at 50 ° C. under normal pressure, and the redox potential and pH were measured. The results are summarized in the table.
[0016]
[Table 1]
Figure 2004329187
From the results in this table, it can be seen that the reducible coffee of the present invention has a very low reductivity of -510 mv, despite the fact that the pH does not change.
[0017]
[Table 2]
Figure 2004329187
According to the results of Table 2, when the reducing coffee obtained in accordance with the present invention is stored in a closed container, the value of the oxidation-reduction potential gradually decreases, and after reaching a minimum value after about 24 to 48 hours, , There was a tendency to gradually ascend and descend. In particular, the reason for this potential change has not yet been elucidated yet, but the rise in the oxidation-reduction potential in the latter half is not affected by the intrusion of ambient air into the container, so it must be sealed separately. It was decided to confirm the change with time of the oxidation-reduction potential when the container was opened.
[0018]
Coffee having an oxidation-reduction potential of −510 mv in Table 1 was left at room temperature, and the relationship between elapsed time, oxidation-reduction potential, and pH was measured. Table 3 summarizes the results.
[0019]
[Table 3]
Figure 2004329187
According to the results shown in Table 3, it can be seen that the reducing coffee obtained according to the present invention, when stored in an open container, does not change the pH but increases only the oxidation-reduction potential. From the above table, it is considered that the oxidation-reduction potential is increased by dissolving oxygen in the air, rather than evaporating the hydrogen gas dissolved in the coffee.
[0020]
【The invention's effect】
As described above, according to the present invention, coffee having a very low oxidation-reduction potential under normal pressure can be obtained, and therefore, can be consumed on a daily basis without causing any health problems.

Claims (5)

常圧下で酸化還元電位が−50mv以下−2000mv以上であるコーヒー。Coffee having an oxidation-reduction potential of -50 mv or less and -2000 mv or more under normal pressure. 常圧下でpHが9.0以下で酸化還元電位が−50mv以下−2000mv以上であるコーヒー。Coffee having a pH of 9.0 or less and an oxidation-reduction potential of -50 mv or less and -2000 mv or more under normal pressure. コーヒーに−180℃〜90℃の水素ガスを0.1気圧〜500気圧に加圧して溶解せしめ、常圧に戻すことにより得られたコーヒー。Coffee obtained by dissolving a coffee by pressurizing hydrogen gas at −180 ° C. to 90 ° C. to 0.1 to 500 atm and returning to normal pressure. 以下の(1)及び(2)の行程からなるコーヒーの製造方法。
(1) コーヒーに−180℃〜90℃の水素ガスを0.1気圧〜500気圧に加圧して溶解せしめる行程、
(2) 前記(1)の行程で得られたコーヒーを常圧に戻す行程。
A method for producing coffee comprising the following steps (1) and (2).
(1) The process of dissolving coffee by pressurizing hydrogen gas at −180 ° C. to 90 ° C. to 0.1 to 500 atm.
(2) A step of returning the coffee obtained in the step (1) to normal pressure.
前記水素ガスをバッチ式又は連続流通式に供給することを特徴とする請求項4に記載のコーヒーの製造方法。The method for producing coffee according to claim 4, wherein the hydrogen gas is supplied in a batch type or a continuous flow type.
JP2003162954A 2003-05-06 2003-05-06 Reducing coffee and method for producing the same Pending JP2004329187A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006051588A1 (en) * 2004-11-10 2006-05-18 Wataru Murota Reducing beverage and process for producing the same
WO2017222031A1 (en) 2016-06-24 2017-12-28 ユニプレス株式会社 Structure for installing tubular member to be connected to fuel tank on vehicle, and piping structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006051588A1 (en) * 2004-11-10 2006-05-18 Wataru Murota Reducing beverage and process for producing the same
WO2017222031A1 (en) 2016-06-24 2017-12-28 ユニプレス株式会社 Structure for installing tubular member to be connected to fuel tank on vehicle, and piping structure

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