• Food Science of Animal Resources
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• v.40 no.4
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• pp.649-658
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• 2020

This study compared aroma compositions and sensory aroma attributes of raw and cooked Tenebrio molitor larvae (mealworms). Main sensory aroma attributes of raw mealworms were strong wet-soil-like, and less-intense oily, shrimp-like and sweet-corn-like. Quantitatively, the major aroma components of raw mealworms were hydrocarbons and aldehydes. As cooking proceeded, sweet-corn-like, roasted, and fried-oil-like sensory attributes were increasingly perceived with steaming, roasting, and frying, respectively. Some pyrazines, pyrrolidines, and carbonyls increased or appeared in roasted and fried mealworms. Partial least squares regression also showed differences in raw and cooked mealworms based on aroma components and their sensory attributes. Unlike raw mealworms, steamed mealworms had a relatively strong sweet-corn-like aroma attribute, which was related to 2,4,6-trimethyl-heptane, 2,4-dimethyl-dodecane, and 3,5-dihydroxy-6-methyl-2,3-dihydropyran-4-one. In comparison, roasted and fried mealworms exhibited roasted, shrimp-like, and fried-oil-like aroma attributes, which were associated with intermediates of the Maillard reaction and lipid oxidation, such as pyrazines, alcohols, and aldehydes. This result during thermal reactions was very similar to those of meat and/or seafood. The use of mealworms as a savory-type flavor enhancer can be expected.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.3
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• pp.328-333
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• 1995

Leaf quality and fatty acid compositions of collected perilla related genus and species germplasms such as Perilla frutescens var. japonica Hara, Perilla frutescens var. acuta Kudo, Perilla frutescens var. crispa Decaisne, Perilla frutescens var. for viridis Makino, Mosla punctulata Nakai, Mosla japonica Maxim, Mosla dianthera Maxim were analysized. The number of leaves per tiller and leaf size of perilla germplasms were more and bigger than those of mosla germplasms. Aroma degree of mosla germplasms was higher than aroma degree of perilla germplasms. Mosla germplasms could be utilized in the breeding for high aroma perilla lines. Otherwise, the softness of perilla germplasms was higher than that of mosla germplasms. In case of oil and protein contents, perilla germplasms was higher than mosla germplasms, however compositions ratio of fatty acid, especially linolenic acid of mosla germplasms was higher than that of perilla germplasms, therefore mosla germplasms could be utilized as breeding materials with high linolenic acid for industrial oil. The linolenic acid with excellent quality and unsaturated fatty acid showed negative correlation with oil content, protein content and saturated fatty acids.

• Journal of the Korean Society of Food Science and Nutrition
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• v.15 no.3
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• pp.258-262
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• 1986

The aroma component analysis of raw and cooked Korean edible mushroom (pleurotus ostreatus) by GC, GC-MS is as follows; 1) The volatile aroma component of raw mushroom is identified such as 3-octanol (46.01%), 3-octanone (18.75%), 1-octen-3-01 (15.39%), isobutyl alcohol (3.48%), and isoamyl alcohol (3.07%) consists 89.04% of total aroma component. 2) Meanwhile, the volatile aroma component of cooked one is identified as 16 kinds and six of them 1-octen-3-ol (66.50%), 3-octanol (10.99%), 3-octanone (9.77%), 1-octene-3-one (1.23%), octyl alcohol (1.12%), and octanol (0.96%) consists 89.61% of total aroma component. 3) The major compositions of aroma component of both raw and cooked ones carbonyl compounds and alcohols. Their number of carbons are $C_2-C_8$ short chain aliphatic compounds

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.4
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• pp.654-658
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• 1996

Organic acid content and volatile aroma components in Jehotang were investigated. Organic acids were detceted by HPLC and it is composed of formic acid(0.07%). lactic acid(0.22%) acetic acid (0.32%), and citric acid(3.17%), the last of which is one of the noteworthy features of Jehotang contributing greatly to its sour flavor and taste. Among the 39 volatile aroma components, whose peaks were identified by GC/MSD, and whose structures were analyzable, 17 kinds of hydrocarbon(30.81%) one kind of aldehyde(7.18%), 2 kinds of ketone(4.79%), 8 kinds of terpene(25.96%) a variety of acids (16%), 2 kinds of alcohol(5.42%), 2 kinds of phenol(2.76%) and 3 kinds of the others(7.68%) were found. The hydrocarbons, terpenes and acids occupied 70% of the aroma components, contributing to and also composing the particular flavor of Jehotang. Extracted pigments from the Jehotang showed maximum light absorbance in the wave length ranges of 200~400nm, showing a high degree of light adsorption of yellow to red color.

• The Korean Journal of Food And Nutrition
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• v.9 no.2
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• pp.181-188
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• 1996

Chemical compositions were investigated by harvested months and produced methods. The level of crude protein and crude ash of ginseng leaf tea harvested in July was slightly higher than it harvested in September. However, the level of crude fat and carbohydrate of ginseng leaf tea harvested in September were higher than it harvested in July. The results indicated that the harvest month influenced the chemical composition of the ginseng leaf tea. Also, the level of free sugar was increased when the ginseng leaf team harvested in September was produced by FHT(fermented and then hot-air dried) or HHT(heated and then hot-air dried). The results indicated that the subjects were preferred the color of ginseng leaf tea which was harvested in July. However, they were preferred the aroma and ginseng's aroma which was harvested and produced by HHT in September. Because they responded that the ginseng leaf tea tasted too bitter, it suggested that the taste of bitterness needed to remove. Also, the astringent, the savory, after aroma, and after say cry of the ginseng leaf tea was improved with FHT or HHT, and those results obtained from September's harvest rather than July's. Therefore, the overall quality of ginseng leaf tea which was harvested in September and produced with FHT or HHT were evaluated better than it of DHT(dried on the shade and then hot-air dried).

• Food Science and Preservation
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• v.30 no.3
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• pp.492-501
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• 2023

In this study, we wanted to understand the impact of different decaffeination processes on aroma compounds of coffee. Therefore, we analyzed differences in physical characteristics and volatile aroma compounds profiles of regular coffee (RC), Swiss water process decaffeinated coffee (SWDC), and supercritical CO₂ decaffeinated coffee (SCDC) after roasting the coffee beans. The electronic nose analysis identified RC and SCDC as different groups which indicates that these groups volatile aroma compound compositions were different. The principal component analysis of volatile compound patterns identified using an electronic nose indicated that there was a large difference in volatile compounds between RC, which was not decaffeinated, and both decaffeinated SWDC and SCDC. The major aroma compounds of RC, SWDC and SCDC were propan-2-one and hexan-2-one which are ketone, and hexanal and (E)-2-pentenal which are aldehyde and 3-methyl-1-butanol which is an alcohol. After roasting, the composition of major volatile compounds appearing in the beans was similar, but the relative odor intensity was different. We identified 28 volatile aroma compounds from RC, SWDC, and SCDC using headspace-solid phase microextraction-gas chromatography/mass spectrometry (HS-SPME-GC/MS), and analyzed 10 major compounds that were present in high abundance, including furfural, 2-furanmethanol, 2,5-dimethylpyrazine, and 2-ethyl-3-methylpyrazine.

• Food Science of Animal Resources
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• v.34 no.2
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• pp.166-171
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• 2014

The aim of this study is to examine the influences of spices on the amounts and compositions of volatile compounds released from cooked beef patty. Beef patty with 0.5% of spice (nutmeg, onion, garlic, or ginger powder, w/w) was cooked by electronic pan until they reached an internal temperature of $75^{\circ}C$. A total of 46 volatile compounds (6 alcohols, 6 aldehydes, 5 hydrocarbons, 6 ketones, 9 sulfur compounds, and 14 terpenes) from cooked beef patties were detected by using purge-and-trap GC/MS. The addition of nutmeg, onion, or ginger powder significantly reduced the production of the volatile compounds via lipid oxidation in cooked beef patty when compared to those from the control. Also, the addition of nutmeg and garlic powder to beef patty generated a lot of trepans or sulfur volatile compounds, respectively. From these results, the major proportion by chemical classes such as alcohols, aldehydes, hydrocarbons, ketones, sulfur compounds, and terpenes was different depending on the spice variations. The results indicate that addition of spices to the beef patty meaningfully changes the volatile compounds released from within. Therefore, it can be concluded that spices can interact with meat aroma significantly, and thus, the character of each spice should be considered before adding to the beef patty.

• Korean Journal of Food Science and Technology
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• v.35 no.1
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• pp.1-6
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• 2003

Chemical compositions of several herbs (rosemary, mint, thyme, sage, and lavender) cultivated in Korea were analyzed. Approximate compositions were as follows: moisture $69.92{\sim}82.10%$, crude ash $2.48{\sim}6.15%$, crude fat $0.40{\sim}2.46%$, crude protein $0.84{\sim}1.57%$, and crude fiber $2.48{\sim}6.15%$. Total contents of phenolics determined by Folin-Dennis's method were in the range of $73.24{\sim}197.79mg%$. Contents of minerals, Na, Ca, Mn, P, Mg, Zn, and Fe determined by ICP-AES were $43.0{\sim}112.5,\;177.5{\sim}304.0,\;0.5{\sim}1.5,\;74.0{\sim}218.5,\;57.0{\sim}116.0,\;1.0{\sim}2.0$ and $3.0{\sim}5.0mg%$, respectively. Free sugar contents determined by HPLC were: sucrose $0{\sim}7.61$, glucose $0.94{\sim}15.92$, and rhamnose $0.64{\sim}7.99mg%$. Fatty acids including palmitic, stearic, oleic, linoleic, linolenic, and arachidonic acids were identified by GC. Linoleic and linolenic acid contents were higher than those of palmitic and stearic acids. Aroma components identified by GC-MS were 1,8-cineole, ${\alpha}-phellandrene,\;{\alpha}-terpinene,\;{\beta}-pinene,\;{\beta}-thujone$, borneol, butan-1-ol, cis-sabinene hydrate, ${\delta}-carene,\;{\gamma}-terpinene$, and verbenone.

• Asian-Australasian Journal of Animal Sciences
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• v.26 no.2
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• pp.282-286
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• 2013

Many manufacturing processes damage the structure of meat products and this often contributes to lipid oxidation which could influence warmed-over flavor (WOF) in precooked beef that is reheated beef. Electrical stimulation causes contraction of muscles and improves tissue tenderization. The purpose of this study was to evaluate the rate of lipid oxidation or warmed-over flavor that could be affected by electrical stimulation of precooked roast beef after refrigerated storage and reheating. The results show that there was no significant difference between chemical compositions and cooking yields when comparing non-electrically stimulated and electrically stimulated roast beef. Moreover, electrical stimulation had no significant effect on oxidative stability and off-flavor problems of precooked roast beef as evaluated by thiobarbituric acid reactive substances (TBARS) and sensory test (warmed-over aroma and warmed-over flavor). However, there was an increased undesirable WOF and a decrease in tenderness for both ES and Non-ES treatments over refrigerated storage time. Electrical stimulation did cause reactions of amino acids or other compounds to decrease the desirable beef flavor in re-cooked meat.

• Korean Journal of Food Science and Technology
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• v.24 no.5
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• pp.440-446
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• 1992

Samil-ju, the traditional Korean rice wine was brewed and distilled using different columns (unpacked and packed) at different pressure (760, 460, 260 mmHg). Fractions of distillate were collected and analyzed. The sample wine, Samil-ju showed the following compositions; ethanol 14%, total acidity 16.2 g/100 ml, reducing sugar 7.9 mg/ml, total sugar 8.4 mg/ml, acetaldehyde 6 ppm, fusel oil acetaldehyde and ethyl acetate 6 ppm. As distillation proceeds, contents of ethanol, methanol, fusel oil, acetaldehyde and ethyl acetate were decreased but total acidity was increased. Generally at reduced pressure, all the constituents but total acidity showed more decrease than those at atmospheric pressure. In the 1st, 2nd and 3rd fractions of the distillate, ethanol contents were maintained at about 70% but those contents decreased abruptly to below 50% from the 5th fraction. Sixteen sensory characteristics were identified as quality factors of distillate. Among them, four characteristics were identified as aroma properties, seven as tastes and five as aftertastes. Nuruk and cooling flavor were considered as important factors which affect greatly the sensory quality of distillate. Among various fractions, the 2nd, 3rd and 4th fractions obtained from unpacked column at 260 mmHg showed the highest score in the overall quality. The compositions of these fractions were ranged as follows; methanol $24{\sim}36\;ppm$, total acidity $0.21{\sim}0.29\;g/100\;ml$, fusel oil 657-1340 ppm, acetaldehyde $12{\sim}41\;ppm$, and ethylacetate $22{\sim}311\;ppm$, respectively.