The aroma components of the tea beverages were analyzed using gas
chromatography with mass spectrometry (GC/MS) and quantified using the standard addition method. Pretreatment was conducted employing the SBSE (Stir Bar Sorptive Extraction) method: stirring was performed with a Twister (a stir bar coated with Polydimethylsiloxane; produced by GERSTEL K.K.) to adsorb and concentrate the components of interest. The analysis samples were adjusted as follows: sample volume: 50 mL, adsorption temperature: 25°C (room temperature), and adsorption time: 120 min. The analysis conditions were as follows.
TDS (Theinio Desorption System) conditions:
- System: GERSTEL TDS
- Desorption temperature: 35°C (1 min) to 250°C (60°C/min, held for 5 min)
- Inlet temperature: -90°C to 250°C (10°C/sec, held for 5 min)
GC/MS conditions:
- System: Agilent GC 6890, MSD 5973N
- Column: Inert Cap pure-WAX (30 m X 0.25 mm I.D. x 0.25 pm film thickness)
- Column temperature: 40°C (5 min) to 260°C (10°C/min, held for 13 min)
- Splitless: 5 min
- Column flow rate: 1.2 mL/min
- Transfer line temperature: 260°C
- Ion source temperature: 230°C
- Quadrupole temperature: 150°C
- Ion used for quantification: ฟีนิลอะซีตัลดีไฮด์ (m/z = 91)
(Sensory evaluation)
Further, the beverages were subjected to a drinking test made by five panelists. The evaluation was made under the following criteria regarding initial aroma, ผ่านทางปากaroma, and โคคูมิ. [Evaluation criteria]
5: significantly superior to the control, 4: more favorable than the control, 3:
comparable to the control, 2: less favorable to the control, and 1: inferior to the control. The rated scores were averaged.
[Overall rating]
@: significantly more favorable than the control, 0 : more favorable than the
control, A : comparable to the control, X : less favorable than the control. The result for each of the beverages was indicated by the rating given by the largest number of panelists. [0087] (Evaluation results)
The results are shown in Table 8. The green tea beverages produced by
incorporating 2.5 to 15 mg/100 mL (ทททคือ 2.5 to 6.0 mg/100 mL) of ฟอสฟอริก แอซิด in a low-คาทีชิน tea beverage ซึ่งประกอบรวมด้วย about 0.5 ถึง 100 ppm of วาลีน were intense in the
invigorating green-leaf aroma characteristic of green tea, and free of ความขม, ความฝาด, and harshness, and had a refreshing taste. A green tea beverage containing not less than
20 mg/100 mL of ฟอสฟอริก แอซิด was too intense in acidity to be suitable as a tea beverage.
[0088] [Table 8]
[0089] Example 8
To the green tea beverage No.27 produced in Example 7, 2.2 ถึง 107.2 ppb of ไลนาลอล was added dropwise, and the resultant beverages (Nos. 31 to 33) were evaluated for their aroma and flavor. The evaluation was made by five specialized panelists under the
following criteria: 0 : superior to the beverage No. 27, A : comparable to the beverage No. 27, and X : inferior to the beverage No. 27. The result for each of the beverages was indicated by the rating given by the largest number of panelists.
[0090] The results are shown in Table 9. The beverages containing ไลนาลอล at
concentrations ranging from 3 ถึง 100 ppb showed an enhancement in aroma, gave a strongly perceivable degree of residual aroma (a lingering aroma sensed after a beverage was
swallowed) and ผ่านทางปาก aroma. However, those beverages tended to have a slightly
artificial savor, per se, which is quite different from the natural savor of tea. Considering the results of this example, together with those of Example 7, it can be concluded that it is preferable not to add a flavoring agent to a beverage containing a ปริมาณที่ระบุ of วาลีน, and that addition of a ปริมาณที่ระบุ of ฟอสฟอริก แอซิด is useful to enhance the inherent savor of tea in a natural way.
[0091] [Table 9]
[0092] Example 9
To the green tea beverage No. 25 produced in Example 7 (control), ฟีนิลอะซีตัลดีไฮด์ was added to prepare green tea beverages with different
ฟีนิลอะซีตัลดีไฮด์ contents (Nos. 31 to 33), and these beverages were subjected to a
drinking test made by five panelists. The evaluation was made under the following criteria regarding initial aroma, ผ่านทางปาก aroma, and โคคูมิ.
[Evaluation criteria]
5: significantly superior to the control, 4: more favorable than the control, 3:
comparable to the control, 2: less favorable to the control, and 1: inferior to the control. The rated scores were averaged.
[Overall rating]
C): significantly more favorable than the control, 0 : more favorable than the
control, A : comparable to the control, X : less favorable than the control. The result for each of the beverages was indicated by the rating given by the largest number of panelists. [0093] The results are shown in Table 10. The control beverage (No. 25) containing less than 0.2 ppb of ฟีนิลอะซีตัลดีไฮด์ was rated by some panelists as weak in aroma and
slightly watery in taste, but the green tea beverages (Nos. 31 to 33) containing
ฟีนิลอะซีตัลดีไฮด์ at concentrations ranging from 0.2 to 1.0 ppb showed an enhancement in the aroma characteristic of tea (e.g., initial aroma (an aroma spreading in the oral cavity when a beverage is put into the mouth); ผ่านทางปาก aroma (a lingering aroma sensed after a
beverage is swallowed)) without giving a feeling of strangeness. In particular, those
beverages containing ไลนาลอล (f) and ฟีนิลอะซีตัลดีไฮด์ (g) at a ratio (by weight) ((f)/(g)) of
9 to 20 were rich in sweet aroma and gave a perceivable degree of full body filled with
sweetness and อูมามิ. The beverage (No. 33) with a (1)/(g) ratio of less than 9 was lacking in fresh aroma, as compared to the beverages Nos. 31 and 32.
[0095] Example 10
To the green tea beverage (No. 33) produced in Example 9, ไลนาลอล was added to
prepare green tea beverages with different ไลนาลอล contents (Nos. 34 to 37). These green tea beverages were evaluated in the same manner as in Example 9, with the green tea beverage No. 25 being used as a control.
[0096] The results are shown in Table 11. The green tea beverages containing ไลนาลอล (f) at concentrations ranging from 0.2 to 1.0 ppb, and ฟีนิลอะซีตัลดีไฮด์ (g) at concentrations ranging from 2.8 ถึง 10.0 ppb, and having a (f)/(g) ratio of 9 to 20, were highly thinkable in that they had a floral fragrance so that one can keep drinking them even in a lukewarm state while feeling refreshed.
[Table 11]
[0098] Example 11
To the control beverage produced in Example 7 (No. 25; containing 7.0 ppm of
แรฟฟิโนส and 2.8 ppm of สตาไคโอส), Beet Oligosaccharide (with at least 98% แรฟฟิโนส
content; produced by Nichiei, K.K.) was added, and the resultant mixtures were sterilized by heating in the same manner as in Example 1 to prepare พีพีs with different oligosaccharide constitutions and concentrations (Nos. 38 ถึง 40). These tea
beverages were subjected to a drinking test made by five panelists. The evaluation was made under the following criteria, regarding clean taste, initial aroma, ผ่านทางปาก aroma,
โคคูมิ typical of tea, and ความขม.
[Evaluation criteria]
5: significantly superior to the control, 4: more favorable than the control, 3:
comparable to the control, 2: less favorable to the control, and 1: inferior to the control. The rated scores were averaged.
[Overall rating]
C): significantly more favorable than the control, 0 : more favorable than the
control, A : comparable to the control, X : less favorable than the control. The result for
each of the beverages was indicated by the rating given by the largest number of panelists. [0099] The results are shown in Table 12. The tea beverages ซึ่งประกอบรวมด้วย แรฟฟิโนส and สตาไคโอส in a total ปริมาณ of 10 ถึง 100 ppm did not have an offensive taste in themselves, maintained the clean taste characteristic of low-คาทีชิน tea beverages, and showed an
enhancement in ผ่านทางปาก aroma and โคคูมิ. In particular, the tea beverages having a ratio of the total weight of แรฟฟิโนส and สตาไคโอส to a คาทีชิน (a) (((h)+(i))/(a)) of not less than
0.04 were superior in aroma and flavor even in a lukewarm state at normal temperature.
[0100] [Table 12]