Packaged coffee beverage
The present invention provides a packaged coffee beverage subjected to heat-sterilization, wherein (A) a concentration of chlorogenic acids is not less than 0.1% by mass and less than 0.14% by mass, (B) a mass ratio of chlorogenic acids/tannin (FOLIN-DENIS method) is in the range of 0.6 to 1.0, and (C) a mass ratio of dichlorogenic acids/chlorogenic acids is in the range of 0.07 to 0.16.
1. A packaged coffee beverage subjected to heat-sterilization, wherein the sterilized packaged coffee beverage comprises
(A) a concentration of chlorogenic acids which is not less than 0.1% by mass and less than 0.14% by mass,
(B) a mass ratio of chlorogenic acids/tannin as determined by the FOLIN-DENIS method in the range of 0.65 to 0.85, and
(C) a mass ratio of dicaffeoylquinic acid/chlorogenic acids in the range of 0.07 to 0.16.
2. The packaged coffee beverage according to claim 1 , wherein the package is a can.
3. The packaged coffee beverage according to claim 1 or 2 , comprising extraction liquids of at least two roast coffee beans having different roast degrees.
4. The packaged coffee beverage according to claim 1 or 2 , comprising an extraction liquid of roast coffee beans treated with activated charcoal.
5. The packaged coffee beverage according to claim 1 or 2 , comprising an extraction liquid of roast coffee beans treated with a mannan-degrading enzyme.
6. The packaged coffee beverage according to claim 1 or 2 , which is sterilized at a temperature of not less than 123° C.
7. A method for producing the packaged coffee beverage according to claim 1 , comprising:
(1): treating a coffee extraction liquid of roast coffee bean having an L value of 14 to 25 with an adsorbent to give a coffee extract (a);
(2): mixing the coffee extract (a) with a coffee extract (b) of roast coffee bean having an L value of 35 to 55 to give a coffee liquid; and
(3): heat-sterilizing the coffee liquid,
and further comprising adding a mannan-degrading enzyme to the coffee extraction liquid before (3).
8. The method for producing the packaged coffee beverage according to claim 7 , comprising the step of adding a mannan-degrading enzyme to the coffee extraction liquid before the treatment with the adsorbent.
9. The method for producing the packaged coffee beverage according to claim 7 , wherein a weight ratio of coffee solid content in (a)/coffee solid content in (b) is from 3 to 8.
10. The method for producing the packaged coffee beverage according to claim 7 , wherein the mannan-degrading enzyme is β-type enzyme.
11. The packaged coffee beverage according to claim 1 , wherein the concentration of chlorogenic acids is from 0.11 to 0.13% by mass.
12. The packaged coffee beverage according to claim 1 , wherein the mass ratio of dicaffeoylquinic acid/chlorogenic acids is from 0.09 to 0.14.