• Food Science and Preservation
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• v.18 no.3
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• pp.341-348
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• 2011

The nutritional components and antioxidative activities of jujube fruit and leaf were investigated and analyzed to provide basic data for functional food materialization and processing. The nitrogen-free extract contents of the fruit and leaf were 71.92% and 41.51%, respectively. The mineral components of the fruit and leaf were rich in Ca (72.14 and 3,252.09 mg/100 g), K (899.82 and 1,708.12 mg/100 g), and P (172.11 and 286.28 mg/100 g), respectively. The major free sugars of the fruit were glucose (13.01 %) and fructose (7.35%); and of the leaf, sucrose (3.94%) and fructose (0.75%). The ascorbic acid contents were higher in fruit (135.73 mg/100 g) than in the leaf (100.43 mg/100 g). The analysis of the component amino acid showed a relatively high ratio of glutamic acid, aspartic acid, proline, and essential amino acids of leucine, but a low methionine and cystine content. The ABTS and FRAP assays indicated that the butanol fraction of the leaf was a more potent radical scavenger and reducing agent than the other five solvent fractions. The butanol fraction of the leaf also presented inhibitory effects against lipid peroxidation in a dose-dependent manner. Therefore, this study verified that the butanol fraction of the leaf has strong antioxidative activities that are correlated with its high level of phenolics, particularly rutin and quercitrin. These phenolics of jujube leaf can be utilized as effective and safe functional food substances, i.e., natural antioxidants.

• Journal of Applied Biological Chemistry
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• v.64 no.1
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• pp.97-102
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• 2021

In this study, enzymes were screened for hydrolysis of defatted perilla seed residue (DPSR) and optimal conditions for enzymatic treatment were determined to produce the hydrolysate of DPSR. Also its antioxidant activity and utilization as a culture medium were examined. The combined treatment of Alcalase and Ceremix is most effective for solubilization of protein and carbohydrate in DPSR. The optimal dosage, pH, and reaction time for enzymatic treatment were found to be 2.0% (w/w), 7.0, and 2 h, respectively. Treatment with optimal conditions of enzymes dramatically increased reducing sugar, soluble protein, and total phenolic content. The hydrolysate of DPSR possessed better scavenging activity against cation and free radicals than enzyme-untreated extract. When Leuconostoc mesenteroides 310-12 was cultured in the hydrolysate of DPSR, cell population rapidly increased compared to enzyme-untreated extract, and titratable acidity increased in proportion to the bacterial growth. In conclusion, these results imply that the hydrolysate of DPSR could be utilized as a bacteria culture medium as well as a physiologically active material with antioxidant activity.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.2
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• pp.234-243
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• 2013

The aim of this study was to evaluate the quality characteristics and antioxidative properties of cookies supplemented with mulberry pomace (0%, 4%, 8%, 12%). The bulk density, spread ratio, and leavening rate of cookies decreased with increasing amounts of mulberry pomace. The lightness and b value (of the Hunter color system) decreased based on the amount of mulberry pomace. The pH of cookies decreased (acidity increased) with increasing mulberry pomace. The soluble solid content increased according to the amount of added mulberry pomace, but the amount of reducing sugars decreased. In texture analysis, cookies with 12% mulberry pomace had the highest hardness. Total phenol and flavonoid content increased according to the amount of mulberry pomace added. Antioxidant activities, such as DPPH radical scavenging, hydroxyl radical scavenging, ABTS radical scavenging, and FRAP were highest in cookies with 12% mulberry pomace. In the sensory evaluation, sensory scores for color, taste, flavor, texture, and overall preference were highest in cookies with 8% mulberry pomace. Thus, our results suggest that the optimum amount of mulberry pomace to add to cookies is 8%.

• Korean Journal of Agricultural Science
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• v.24 no.1
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• pp.29-40
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• 1997

Six different types of teas from box thorn leaves collected on mid May were prepared by using different tea making procedures. The selected physicochemical propentes and the sensory qualities of the 6 different teas were analyzed. The box thorn leaves contained 87.71% moisture, 0.69% crude fat, 4.77% crude protein, 2.13% fibers, 3.11% carbohydrates and 1.59% ash. Based on the sensory analysis, roasted tea(duckum tea) had the highest values in taste, flavor, color and overall preference. Eighteen free amino acids were identified in the roasted tea, showing the specially high levels of proline(170.15mg%) and glutamic acid(112.34mg%). The roasted tea also contained glucose(1.07%), maltose(0.87%), sucrose(0.63%) and fructose(0.55%). The content of citric acid(337.43mg%) in the roasted tea was the highest, followed by malonic acid(54.17mg%), oxalic acid(48.66mg%), malic acid(27.41mg%), succinic acid(4.48mg%), fumaric acid(1.08mg%) and lactic acid(trace amount), in a decreasing order.

• Korean Journal of Food Science and Technology
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• v.28 no.2
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• pp.371-377
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• 1996

Potential health promoting effects such as antiallergic, anti-inflammatory, antiviral, anticancer and anticarcinogenic properties have been ascribed to citrus flavonoids. Dietary fibers have also been used as functional food components due to the various beneficial physiological activities. Two kinds of flavonoids, naringin and hesperidin, were identified both in the pulp and in the peel of Korean tangerine. The contents of naringin and hesperidin in the pulp were 2.95 mg/100 g and 0.53 mg/100 g, respectively. However, the contents of naringin and hesperidin in the peel were much higher (10.77 mg/100 g and 38.90 mg/100 g) thanthose of two identified flavonoids in the pulp. The content of soluble dietary fiber (SDF) in the pulp of tangerine was 1.90%, insoluble dietary fiber (IDF) 0.37%, and total dietary fiber (TDF) 2.27% based on wet matter, respectively. The content of SDF was 1.09%, IDF 4.77% and TDF 1.86% in the peel of tangerine. The total pectin content was 1.53% in the pulp and 0.94% in the peel of tangerine. The peel of Korean tangerine, a by product in tangerine processing, would be a good source for the production of naringin, hesperidin and pectin.

• Food Science and Preservation
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• v.13 no.4
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• pp.465-471
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• 2006

The chemical components of chlorella powder and quality characteristics (texture, color and sensory evaluation etc.) of white bread added with chlorella powder in order to use as a new functional food material of chlorella powder were examined. The proximate composition was composed of crude protein 61.45%, crude fiber 13.47%, nitrogen free extract 13.15%, ash 6.35%, moisture 3.27% and crude fat 2.31%, respectively. The component of major minerals were P (1,478.94 mg%), K (250.54 mg%), Ca (147.24 mg%) and Na (107.26 mg%) and free sugar was composed of maltose 0.12%, glucose 0.09% and fructose 0.08%. The major amino acids of chlorella powder were glutamic acid(4,009.20 mg%), aspartic acid(3,017.72 mg%), proline(3,055.24 mg%), methionine(3,001.52 mg%) and histidine(2,951.06 mg%). The major fatty acids in chlorella powder were composed of linoleic acid and the amounts of those showed 34.27%. The volume tended to increase according to the addition of chlorella powder. Substituting chlorella powder with flour also resulted in decreased lightness, redness and yellowness of the white bread crust The color of white bread crust became darker as the amount of chlorella powder increased. The texture characteristics of white bread containing chlorella powder was no significant difference. The result of sensory evaluation by QDA (quantitative descriptive analysis) showed that overall acceptability of white broads containing 0.2% chlorella powder were higher than that of control without chlorella powder.

• Food Science and Preservation
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• v.20 no.5
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• pp.608-613
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• 2013

The physicochemical characteristics and antioxidant capacities of 15 red wines (Cabernet Sauvignon) from the US (5) and Chile (10) were investigated. The contents of soluble solid, reducing sugar, titratable acidity, and $SO_2$ were measured. Antioxidant capacities were examined by DPPH, ORAC assay, and total phenolic contents. In addition, polyphenols composition were analyzed by HPLC. The contents of soluble solid, reducing sugar, and acidities were 7.03~8.6 $^{\circ}Brix$, 2.7~6.7 g/L, and 0.7~0.8%, respectively, and showed no differences between wines from the two countries (p<0.05). The $SO_2$ content of Chile wines was 50% higher than that of US wines (p<0.05). Antioxidant activities by DPPH assay ranged 5.58~9.80 mM and 6.77~9.48 mM in the US and Chile wines, respectively. The ORAC values of the US and Chile wines ranged 2.17~18.08 mM and 4.55~33.77 mM, respectively. The total phenolic content ranged from 1,315 to 2,651 mg/L among the US red wines, and from 1,653 to 2,493 mg/L among Chile red wines. Gallic acid, catechin, syringic acid, p-coumaric acid, quercetin, and kaempferol were identified by HPLC. The polyphenol contents of the Chile red wines were higher than those of the US red wines(p<0.05). There were no differences in the physicochemical characteristics and the antioxidant capacities of the wines from US and Chile, but only in their $SO_2$ and polyphenol contents (p<0.05).

• Food Science and Preservation
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• v.15 no.4
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• pp.593-597
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• 2008

This study was performed for obtaining optimal extraction conditions to produce peach liqueur containing chitosan. Alcohol content of unsliced fruits was the largest recording 30% after extracting for 8 weeks and those of fruits sliced into four pieces were high recording around 28% after extracting for $6{\sim}8$ weeks. Sugar content was $11{\sim}13^{\circ}Brix$, total acidity was around 0.2% and pH was about 4.8. While soluble solids content was around 2.8% in unsliced fruits with a little change of the content, those of fruits sliced into four pieces were ranged from 2.8% to 3.1% and showing a tendency that longer extraction time increased the content. Brownness of unsliced fruits and fruits sliced into four pieces were $0.33{\sim}0.54$ and $0.56{\sim}0.73$ respectively. Total phenol content showed a similar tendency with brownness and the total phenol content of sliced fruits was higher than that of unsliced fruits by only around 0.2 mg%. When peach liqueur was made by extracting unsliced fruits massively by following conditions set above, methanol content grew with longer extraction time but the difference was not significant and the content was detected to be extremely small recording about 50 ppb. Among organic acids, oxalic, malic and citric acids were found, and fructose, glucose, sucrose and maltose were detected as free sugars. In conclusion, extracting unsliced fruits for 8 weeks as extraction conditions showed an excellent quality in overall for peach liqueur containing chitosan.

• Journal of the Korean Society of Food Science and Nutrition
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• v.42 no.12
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• pp.2035-2041
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• 2013

The effects of Aspergillus oryzae rice koji (AO) and Asp. kawachii rice koji (AK) as enzyme preparations, on the quality characteristics of rice mash were invested in this study. The amount of AORM (Asp. oryzae rice mash) and AKRM (Asp. kawachii rice mash) were 50, 100, 200% (w/w) based on 100 g of rice. Firstly, in the titer measurement result on the ${\alpha}$-amylase and glucoamylase activities of AO and AK. On the other hand, the acid protease activity has values of 31.56 unit for AO and 849.17 unit for AK. The sugar solid of the AORM and AKRM groups significantly increased as the rice koji ratio on rice was higher, which were shown with values as high as 17.63~20.53 and 17.51~19.28, respectively. Glucose and maltose were detected for free sugar of AORM. Only glucose was found in AKRM. Citric acid, malic acid, and lactic acid were detected as the organic acid of KORM; oxalic acid, citric acid, and succinic acid were detected for AKRM, and the content increased as the rice koji ratio on rice increased (P<0.05). From the above result, rice koji with useful mold is expected to be used broadly in foods by looking at the fact that it has starch degradation ability and organic acid producibility.

• Food Science and Preservation
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• v.15 no.2
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• pp.185-190
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• 2008

We investigated changes in fruit quality of Hallabong tangor (Citrus Kiyomi ${\times}$ ponkan) that was packaged with Si+CaO and LDPE film. The flesh ratio during storage was 74.33% (${\pm}3.66$) to 81.56% (${\pm}1.38$). Firmness of M16A, a variant of Hallabong tangor, was higher 100g-force than that of Hallabong tangor, changes of firmness was not shown among film packages. A fruit juice was $12-14^{\circ}$Brix, and this increased somewhat at the end of storage without film packaging. The titratable acidity of the M16A variety was 0.2% lower than that of the Hallabong tangor. Hallabong and M16A maintained freshness and taste for 120 and 60 days, respectively. The level of reducing sugars in the Hallabong tangor was 1% higher than that of the M16A variety. Reducing sugars increased at room temperature storage without film packaging. Total sugar content was 9.19% (${\pm}2.03$) to 12.78% (${\pm}0.75$). The content of vitamin C declined slowly after 105 days of storage. In conclusion, storage of Hallabong tangor with film packaging coated with Si+CaO was effective for maintaining freshness and quality.