• Journal of the Korea Convergence Society
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• v.12 no.11
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• pp.419-426
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• 2021

Until recently, various studies for the production of high-acidity vinegar have been conducted, but there have been few studies on the concentration process of vinegar. In this study, the possibility of introducing freeze-concentration method was investigated for the production of high-quality, high-acidity vinegar. Acidity, pH, specific gravity, and glucose concentration were measured for frozen concentrated vinegar fractions obtained by freezing and thawing three types of Rubus coreanus vinegar with different acidy (7.53, 5.43, and 3.72). Acidity, specific gravity, and glucose concentration were all highest when 15% of the original vinegar was thawed. pH was the lowest when 15% of the original vinegar was melted. As a result of the measurement of cumulative acidity, when 20% of the original vinegar was melted, it was the highest at 9.32, which was 3.89 higher than that of the original vinegar. In this study, it was confirmed that vinegar can be effectively concentrated using the freeze concentration method and at the same time, the thawing ratio can be controlled to effectively obtain vinegar with the desired acidity. However, it is considered that studies such as organic acid and amino acid analysis are needed to determine whether the freeze-concentration method is introduced into the high-acidity concentrated vinegar manufacturing process.

• Korean Journal of Food Science and Technology
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• v.46 no.4
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• pp.418-424
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• 2014

High-acidity vinegar was manufactured using pear concentrate by fed-batch fermentation without additional nutrients, and the physicochemical properties and volatile components were investigated at different fermentation stages (Stages 1-4) and at various initial alcohol concentrations (IAC; 6-9%). The levels of reducing sugar, free amino acids, total phenolic content, total flavonoid content, and radical scavenging ability increased slightly during Stage 4 (high-acidity vinegar), which was affected by alcohol feeding. The contents of approximately 20 types of volatile compounds differed between the moderate- and high-acidity vinegar samples, as determined by solid-phase microextraction/gas chromatography-mass spectroscopy. The level of acetic acid in high-acidity vinegar increased according to the initial alcoholic content applied. The high-acidity vinegar produced by fed-batch culture at an IAC of 6-7% showed improved physicochemical and volatile properties as compared to the moderate-acidity vinegar.

• Food Science and Preservation
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• v.22 no.1
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• pp.100-107
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• 2015

This study was conducted to develop a high-acidity vinegar production (over TA 10%) technology using grape juice to reduce the importation of high-acidity vinegar. The manufacturing condition's effect on the quality of high-acidity vinegar using pure grape juice without the addition of other nutrients for fermentation was investigated. Twelve percent acidity in vinegar was obtained from grape wine with 6% alcohol content. The acetic-acid yield from grape wine decreased when the wine's initial alcohol content was high, which extended the induction time. The pH value was similar in all the treatment groups. The sugar content of the 1st-stage fermentation (1st AAF) was proportional to the initial alcohol content whereas in the 2nd-stage fermentation (2nd AAF), the sugar content was highest in the 6%-alcohol treatment. The major organic acids of the high-acidity grape vinegar included tartaric acid, malic acid, and citric acid. The acid content of the high-acidity initial alcohol group was higher than that of the low-acidity initial alcohol group due to the alcohol content added by the fed-batch and acetic-acid yield difference. The ethyl alcohol content was 364~6,091 ppm (the main alcohol while the others had only traces in all the groups). In conclusion, it was possible to manufacture 12% high-acidity vinegar without the addition of an external nutrient source to grape wine containing 6% initial alcohol content. Finally, a complementary study will be required to shorten the fermentation period through the fed-batch-style addition of alcohol for the purpose of industrialization.

• Microbiology and Biotechnology Letters
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• v.21 no.5
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• pp.511-512
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• 1993

The production of vinegar containing high acetic acid concentration was carried in a single stage fed-batch culture. The initial and residual ethanol concentration were 50.0g/l and 5.0g/l, respectively, and the ethanol concentration was maintained from 5.0g/l to 10.0g/l during fedbatch culture. The fermentation temperature was decreased by 1C for every increase of 2.0% in acidity. The maximum productivity was 2.53g/l-hr and the acidity was 16.08% after 40 hours of acetic acid fermentation.

• The Korean Journal of Food And Nutrition
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• v.37 no.4
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• pp.189-196
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• 2024

To develop farm-made high effective vinegar, this study prepared apple vinegar using four kinds of acetic acid bacteria isolated from a natural fermentation liquid of 'Cheongsoo' grapes and analyzed vinegar samples fermented 93% apple juice and 7% alcohols at 30℃ for 20 days. To accomplish this, quality characteristics such as pH, total acidity, reducing sugar, organic acid, color, total polyphenol contents, and antioxidant activity contents were determined. The pH decreased while total acidity of all samples gradually increased during fermentation period. The vinegar with AP 21 strain tended to increase the total acidity quicker than other stains. Reduced sugar content remained high until the last fermentation day. Furthermore, reduced sugar contents of all vinegars increased as fermentation progressed by decomposing sucrose present in apples. When physiological activities were compared, apple vinegars fermented with AP 21 and 30 strains had higher total polyphenol and flavonoid contents than other samples. However, there was no significant difference in antioxidant activity between samples. These results indicate that strain 21 is the most suitable starter as acetic acid bacteria for producing farm-made vinegar.

• Food Science and Preservation
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• v.31 no.2
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• pp.235-244
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• 2024

A nonthermally sterilized raw apple vinegar was manufactured using an ultra-fine filtration process (0.2 ㎛ membrane filter) and its quality was comparable to commercially available vinegar products. First, using apple concentrate as a raw material, it was possible to produce non-thermal sterilized Using a two-stage fermentation process of alcohol and acetic acid fermentations, a non-thermally sterilized raw apple vinegar with pH 2.94 and an acidity of 6.20% was produced from an apple concentrate. The fermentation process increased the browning index significantly. However, the fundamental quality parameters of the non-thermal sterilized raw apple vinegar (A) with sterilized apple vinegar (B) did not differ significantly. The pH (2.92-2.95) of apple vinegar (A and B) was higher than that (pH 2.65-2.70) of commercial vinegar (C and D), and the total acidity, which is in the range of 6.20-6.21% and 6.53-6.90%, respectively, was higher in samples C and D than in samples A and B. However, four kinds of organic acids were detected in non-thermal sterilized raw apple vinegar (A), and its total organic acid content (6,245.00 mg%) was significantly higher than that of other samples (B, C, D) (p<0.05). In particular, malic acid content, as a main organic acid in apples, was very high in sample (A) (244.83 mg%) and sample (B) (210.21 mg%), compared to commercial products C (125.78 mg%) and D (86.90 mg%). The total polyphenol content and antioxidant activity of fermented apple vinegar (A, B) were more than twice as high as those of commercial products (C, D). Vinegar A had higher total polyphenol content than vinegar B. The above results suggest it is possible to manufacture and commercialize non-thermal sterilized raw apple vinegar with higher organic acid content and antioxidant properties using ultra-fine filtration.

• Journal of the Korean Society of Food Science and Nutrition
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• v.28 no.2
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• pp.353-358
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• 1999

We produced the apple vinegar with only apple fruits, no adding sugar and others through two stages fermentation(alcohol fermentation and acetic acid fermentation). At the first stage, apple wine contained 5% alcohol was produced at the 5th day. And through the second stage, acetic acid fer mentation, apple vinegars of which total acidity is 5.88% were produced. In comparision with com mercial vinegars for physicochemical quality, it was the lowest in total acidity. But contents of oxalic, tartaric, malic, citric, succinic acid in it were higher than other vinegars. Especially the content of malic acid in it was higher 5 times than other vinegars. Malic acid was known that it was abundant in apple fruits. Also the contents of free amino acids were distinctly high such as 21.97mg% in two stages fermented apple vingars. Potassium content in it was higher 4 times than other vinegars. So it was supposed that two stages fermented vinegar had much higher quality than commercial vinegars.

• Food Science and Biotechnology
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• v.14 no.4
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• pp.509-513
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• 2005

The purpose of this study was to develop a new preparation process of ginseng extract using high concentrations of ginsenoside $Rg_3$, a special component in red ginseng. From when the ginseng saponin glycosides transformed into the prosapogenins chemically, they were analyzed using the HPLC method. The ginseng and ginseng extract were processed with several treatment conditions of an edible brewing vinegar. The results indicated that ginsenoside $Rg_3$ quantities increased over 4% at the pH 2-4 level of vinegar treatment. This occurred at temperatures above $R90^{\circ}C$, but not occurred at other pH and temperature condition. In addition, the ginseng and ginseng extract were processed with the twice-brewed vinegar (about 14% acidity). This produced about 1.5 times more ginsenoside $Rg_3$ than those processed with regular amounts of brewing vinegar (about 7% acidity) and persimmon vinegar (about 3% acidity). Though the white ginseng extract was processed with the brewing vinegar over four hr, there was no change for ginsenoside $Rg_3$. However, the VG8-7 was the highest amount of ginsenoside $Rg_3$ (4.71%) in the white ginseng extract, which was processed with the twice-brewed vinegar for nine hr. These results indicate that ginseng treated with vinegar had 10 times the quantity of ginsenoside $Rg_3$, compared to the amount of ginsenoside $Rg_3$ in the generally commercial red ginseng, while ginsenoside $Rg_3$ was not found in raw and white ginseng.

• Journal of the East Asian Society of Dietary Life
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• v.6 no.2
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• pp.221-227
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• 1996

This study was performed to analyze general components such as, organic acids, alcohols and minerals In persimmon vinegar made with quick fermented using deteriorated sweet persimmon and four commercial vinegars (rice vinegar, apple vinegar, brewed vinegar, traditional persimmon vinegar) purchased In local markets for quality evaluation. The pH and total acidity of all vinegars were in the range of 2.02-3.02 and 4.62-9.78%, respectively The pH of quick fermented persimmon vinegar (A) was relatively higher than that of others. Acidity was the highest in brewed vinegar. Total sugar content was in the range of 0.45-6.43%. These contents were high In were high In traditional persimmon vinegar wherase low in brewed vinegar. Total nitrogen and amino-nitrogen were in the range of 0.025-0.046% and 0.015-0.029%. Organic acids were identified as acetic acid, citric acid, tartaric acid malic acid, succinic acid, formic acid and oxalic acid. While major minerals of all vinegars were Mg, Ca, and Na, minor minerals were Zn, Cu, Mn and Fe.

• Journal of the Korean Society of Food Science and Nutrition
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• v.43 no.6
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• pp.877-883
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• 2014

This study investigated the manufacturing conditions of apple vinegar with high acetic acid content following fermentation according to alcohol concentration without any nutrients. We compared and analyzed the quality characteristics of high acetic acid fermentation by varying the initial alcohol content (6%, 7%, 8%, and 9%). In the results, it was possible to manufacture high acetic acid vinegar with 12% titratable acidity and an alcohol content of 6% and 7%. Lower initial alcohol content was associated with higher yield due to a shorter lag phase. For quality characteristics of the high acetic acid apple vinegar, pH was 2.91~3.20, titratable acidity was 12.0%, and organic acid consisted of acetic acid, malic acid, critic acid and oxalic acids. Based on the results, high acetic acid apple vinegar was produced using a two stage fermentation process after alcohol fermentation but the further research is needed to reduce the time of fermentation in fed-batch culture for industrial use.