• 대한본초학회지
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• 제27권6호
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• pp.37-42
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• 2012

Objectives : Angelica Gigantis Radix is prescribed as the root of different Angelica species on the pharmacopoeia in Korea, Japan and China. Chemical components and their biological activities were also different according to their species. A study for the development of simple method to compare Angelica roots was needed. In order to classify them, the methods such as DNA sequencing analysis and taste sensor were applied to three Angelica species like Angelica gigas, Angelica acutiloba and Angelica sinensis. Methods : PCR amplification of intergenic transcribed spacer (ITS) region was performed using ITS1 and ITS4 primer from nine Angelica roots, and then nucleotide sequence was determined. Taste pattern of samples were measured using the taste-sensing system SA402B equipped with a sensing unit, which consists of artificial lipid membrane sensor probes of anionic bitterness, astringency, saltiness, umami, and cationic bitterness (C00, AE1, CT0, AAE, and AN0, respectively). Results : As a result of comparing the similarity of the ITS region sequences, A. sinensis was discriminated from the others (A. gigas and A. acutiloba). Equally this genetic result, A. gigas and A. acutiloba showed similar taste pattern as compared to A. sinensis. Sourness, bitterness, aftertaste of bitterness, astringency, and aftertaste of astringency of A. sinensis were significantly high as compared with A. gigas and A. acutiloba. In contrast, richness was significantly low. Conclusions : These taste pattern can be used as a way of comparison of Angelica species and this technic could be applied to establish a taste pattern marker for standardization of herbs in various purposes.

• 환경생물
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• 제20권3호
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• pp.268-275
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• 2002

Seasonal variation in reproductive condition of the Pacific oyster Crassostrea gigas was investigated from a suspended cultured oyster population in Gosung Bay, South Korea using histological techniques, Gametogenesis of oysters initiated in February when water temperature reached 11 to $13^\circ{C}$. Increase in oocyte size and the number resulting in follicle expansion was observed from March to May First spawning of oysters observed in mid Jun when the surface water temperature reached 22 to $25^\circ{C}$. Spawning activity of oysters extended from mid June to late September with two marked spawning peaks in June and August. Most oysters collected from October to December exhibited few residual eggs in packed follicles exhibiting a typical spent condition. No gametes were observed from December to February from oysters collected in the Bay. Gonadal development of oysters in the Bay seemed to follow a seasonal fluctuation in environmental conditions such as water temperature and food availability in the water column. Spawning of oysters in late June was in part associated with sudden drop in salinity due to vast amount of freshwater input in the Bay after the summer flooding. Sex ratio of oysters was 59.5% male and 39.8% female. Less than 1 percent (0.6%) of the oysters examined were hermaphrodite; few eggs were observed in testis.

• 한국양식학회지
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• 제13권2호
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• pp.119-128
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• 2000

진주담치(Mytilus edulis), 홍합(Mytilus coruscus), 참굴(Crassostrea gigas) 및 진주조개(Pinctata fucata martensii)를 인위적인 방란 방정을 유도하여 이들의 수정란과 부유유생을 사육하여 난 발생, 유생의 성장 및 형태를 비교한 결과는 다음과 같다. 수정란의 크기는 진주담치와 홍합이 각각 65.1 ${\mu}m$, 70.3 ${\mu}m$로 비슷한 크기를 보였고, 참굴과 진주조개는 각각 52.3 ${\mu}m$, 45.3 ${\mu}m$로 비슷한 크기를 보였다. 수정란에서 D형 유생으로 되는 데 소요되는 시간은 진주담치와 참담치는 자연수온(17.0$\pm$1$^{\circ}C$)에서 각각 47시간55분, 45시간 55분이 소요되었고, 참굴과 진주조개는 수온 21.$0^{\circ}C$와 26.$0^{\circ}C$에서 각각 23시간 55분과 22시간이 소요되었다. 진주담치, 홍합, 참굴, 진주조개가 초기 D형 유생에서 부착기 유생으로 성장하는 데는 각각의 수온에서 각각 20일, 27일, 22일, 및 21일이 소요되었고 이때의 평균 각장의 크기는 각각 194.1 ${\mu}m$, 233.6 ${\mu}m$, 274.9 ${\mu}m$, 190.9 ${\mu}m$ 였다. 초기 D형 유생에서 초기 부착기 유생까지 각장(L)과 각고(H)의 상관관계는 높으며, 각장에 따른 각고/각장의 비율(H/L)은 진주담치: H/L : 0.002L+0.5334 (($R^2$ = 0.957), 홍합: H/L : 0.001L+0.603 ($R^2$ : 0.944), 참굴: H/L =0.001L+0.871 (($R^2$=0.550) 및 진주조개: H/L =0.001L+0.791 (($R^2$ = 0.700)로 나타났다

• 현장농수산연구지
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• 제23권2호
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• pp.5-14
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• 2021

참당귀의 유효성분인 nodakenin, decursinol, decursin, decursinol angerate 4종의 함량이 균주에 따라 어떤 물질의 변화를 일으키는지를 알아보기 위해 Bacillus EMD17, 9-3, HCD2, #8, 191 5종과 Lactobacillus KCTC 3320, WCP02, S65, P1201 4종 모두 9종류의 균주를 이용하여 발효 실험을 실시하였던 바 아래와 같은 결과를 얻었다. 1. 참당귀의 추출물에 Bacillus균을 접종하여 발효한지 2일 경과한 후부터 지표물질인 decursin과 decursinol angerate의 함량이 급격히 감소하였다. 이는 발효한지 4일이 경과한 후에도 decursin과 decursinol angerate의 함량이 2일째와 동일했다. 반면 발효한지 4일이 경과한 후에 nodakenin과 decursinol의 함량이 높아졌다. 또한 decursin의 함량은 발효한지 6일이 지난 후에는 크게 증가하였다. 2. 참당귀의 추출물에 Bacillus균을 접종 후 nodakenin과 decursinol의 물질변화는 균 종류에 관계없이 거의 나타나지 않았다. Decursin과 decursinol angerate의 유효함량 변화는 Bacillus EMD17, 9-3에서 큰 것으로 나타났다. Decursin과 decursinol angerate의 함량 변화는 Bacillus HCD2, #8, 191균주에서 거의 나타나지 않았다. 3. 참당귀의 추출물에 Lactobacillus KCTC 3320, WCP02, S65, P1201 4종류를 이용하여 발효한지 8일 후에 유효성분 변화를 알아본 결과균의 종류와 상관없이 nodakenin과 decursinol의 함량 변화는 거의 나타나지 않았다. 그러나 Lactobacillus S65, P1201로 발효를 한 경우에는 decursin과 decursinol angerate의 함량에서 변화가 나타났다.

• 한국약용작물학회지
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• 제23권6호
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• pp.454-459
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• 2015

Background : The major compounds of Angelica species are decursin, decursinol angelate, nodakenin, umbelliferone and ${\beta}$-sitosterol, which act anti-inflammatories, reduce pains, protect the liver and enhance the immune system. This study investigated the chemical compositions, minerals, metals, sugars and overall amino acid composition in Angelica gigas Nakai. Methods and Results : Powder of Angelica roots smaller than 30 mesh were used. Physico-chemical analysis revealed the presence of carbohydrates (62.0%), crude proteins (13.9%), moisture (11.4%), crude fats (7.3%) and ash (5.4%). Results showed that potassium was present in the highest amount (1,859 ppm), followed by magnesium (214.5 ppm), calcium (147.3 ppm) and sodium (6.0 ppm). Free sugar profiles showed the presence of sucrose (29.3 g/100 g). The total amino acids concentrations was 9,752 mg/100 g, the most common and dominant amino acids were arginine (2,181 mg/100 g), glutamic acid (1,212 mg/100 g) and aspartic acid (834 mg/100 g). The total free amino acids contents was 1,476 mg/100 g, in which the most common amino acid were arginine (932 mg/100 g), glutamic acid (127 mg/100 g), and ${\gamma}$-aminobutyric acid (80.4 mg/100 g). The fatty acid composition of A. gigas showed a higher concentration of unsaturated fatty acids such as linoleic acid (443.9 mg/100 g) and palmitic acid (181.3 mg/100 g) according to gas chromatography. Conclusions : These results showed that Angelica roots can be used in various fields of foods and medicines, and in the preparation of cosmetics.

• 한국수산과학회지
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• 제48권5호
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• pp.668-673
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• 2015

The pacific oyster Crassostrea gigas has a desirable taste and flavor that differs from those of other fish and shellfish. In order to develop a high value-added product from individually quick-frozen oyster extract (IQFOE), we prepared an oyster sauce from IQFOE and characterized its volatile compounds using vacuum simultaneous steam distillationsolvent extraction / gas chromatography / mass spectrometry. The moisture, crude protein, crude ash, salinity, pH and volatile basic nitrogen contents of the oyster sauce were 60.6%, 8.2%, 9.2%, 9.3%, 5.7 and 21.0 mg/100 g, respectively. Seventy-six volatile compounds were detected in the cooked odor of the oyster sauce. These volatile compounds included 14 esters, including ethyl acetate, 13 nitrogen- containing compounds, including 2,4,6-trimethyl pyridine, 13 acids, including hexadecanoic acid, 12 alcohols, including ethyl alcohol and 6-methyl heptanol, 6 alkanes, 5 aldehydes, including benzaldehyde, 5 ketones, including 1-(2-furanyl)-ethanone, 4 furans, including 2-furancarboxaldehyde and 2-furanmethanol, 3 aromatic compounds, including d-limonene, and 1 miscellaneous compound. Esters, acids and nitrogen-containing compounds, and alcohols were the most abundant compounds in the odor of the cooked oyster sauce, with some aldehydes, ketones, and furans.

• 한국수산과학회지
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• 제47권5호
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• pp.501-507
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• 2014

Norovirus (NoV) is a major cause of food poisoning outbreaks in Korea. Most NoV outbreaks originate from environmental contamination, but bivalves such as oysters are also important vectors. Oyster Crassostrea gigas contamination by NoV has been reported in Korea, but no quantitative analyses of NoV have been performed. We investigated the NoV concentration in 21 oyster samples from a Korean commercial oyster-growing area with confirmed fecal contamination from January to December 2012, using real-time reverse transcription-polymerase chain reaction. Additionally, we assessed the NoV concentration after heating to investigate the effects of heat treatment on NoV-infected oysters. In NoV-positive samples, the cycle threshold (Ct) values were 37.43-39.41 and 36.77-39.30, while viral concentrations were $8.97{\times}10^2-2.24{\times}10^2$ and $3.05{\times}10^2-7.47{\times}10^1$ copies/g for genogroups I and II, respectively. After heat treatment, NoV genogroup I decreased by 83.4%, 88.0%, 89.4% and 100% at $60^{\circ}C$, $68^{\circ}C$, $70^{\circ}C$, and $100^{\circ}C$, respectively, for 15 min, while genogroup II respectively decreased by 67.3%, 76.3%, 80.1%, and 89.8% under the same conditions.

• 한국식품영양과학회지
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• 제27권3호
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• pp.399-405
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• 1998

This study was carried out to investigate the effects of herb extracts on lipid oxidation and free radical reaction in iron sources reacted with active oxygen species. The catalytic effects of active oxygen on lipid oxidation in oil emulsion tended to show more active in the order of OH, H2O2 and KO2. Herb extracts tended to show a little catalytic effect and active oxygen scavenging ability of herb extracts didn't show. But herb extracts played role as a strong chelating agents to bind iron if Fe2+ ion exist in oil emulsion. The contents of Fe2+ ion and total iron in Salvia miltiorrhiza Bge. and Angelica gigas Nakai were higher than those of Prunus persica Stockes and pinus strobus. The content of asocrbic acid in Pinus strobus showed the highest (26.97ppm) among several herb extracts. Electron donating abilities of Pinus strobus and Salvia miltiorrhiza Bge. were 79.54% and 77.11%, respectively, which were higher contents than those of Prunus persical Stokes and Angelica gigas Nakai. The SOD-like activity of Prunus persca Stokes showed 0.16 optical density (O.D), which means the most strong antioxidant activity among other herb extracts. The nitrite scavening effects tended to be different depending on pH. Pinus strobus and Angelica gigas Nakai showed 99.8% and 98.6% nitrite scavening effects at pH 1.2. And the effects were decreased as pH was increased. Especially, they didn't show the nitrite scavenging effect in pH 6.0. In conculsin, the Prinus strobus extract among herb extracts were the most effective antioxidant by evaluating several functional tests.

• Fisheries and Aquatic Sciences
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• 제17권3호
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• pp.377-380
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• 2014

RNA interference (RNAi)-mediated transcriptional knock-down of Crassostrea gigas big defensin 1 and 2 genes (Cg-BigDef1 and Cg-BigDef2) was investigated. The cDNA sequences of Cg-BigDef1 and Cg-BigDef2 were identical, excluding an additional fragment of 20 nucleotides in Cg-BigDef1; thus, a long double-stranded RNA (dsRNA) targeting the mRNA of Cg-BigDef2 effectively downregulated both Cg-BigDef2 and Cg-BigDef1. In addition, long dsRNA targeting green fluorescent protein (GFP) did not affect transcription of the two big defensin genes. These results suggest that the transcriptional downregulation of Cg-BigDef1 and Cg-BigDef2 was mediated by sequence-specific RNA interference (RNAi). Despite injection of long dsRNA targeting Cg-BigDef2 into only the adductor muscle, knock-down of Cg-BigDef1 and Cg-BigDef2 was observed in the adductor muscle, hemocytes, mantle, and gills, suggestive of systemic spread of RNAi in C. gigas. Furthermore, the inhibitory effect of dsRNA persisted until 72 h post-injection, indicative of a long-lasting RNAi-mediated knock-down of target genes.

• 한국수산과학회지
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• 제50권4호
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• pp.335-342
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• 2017

Oysters Crassostrea gigas are a globally popular shellfish for human consumption. As filter-feeding bivalve mollusks, oysters may harbor many microorganisms and chemicals that could pose potential human health risks. The objective of this study was to investigate the suitability of cultured oysters for raw consumption or use in seafood products by measuring concentrations of harmful microorganisms and chemicals in their flesh. Microbial concentrations in cultured oysters were found to be: $1.0{\times}10^2-6.0{\times}10^4CFU/g$ (viable cell counts), not detected $(ND)-5.4{\times}10^3CFU/g$ (coliform bacteria), $ND-1.3{\times}10^2CFU/g$ (E. coli), and $ND-4.6{\times}10^3CFU/g$ (Vibrio parahaemolyticus). Other pathogenic bacteria, including Enterohemorrhagic E. coli (EHEC), Listeria monocytogenes, Staphylococcus aureus, and Salmonella spp., were not detected in any samples. Heavy metal concentrations of cultured oysters were ND-0.239 mg/kg (total mercury), ND-1.091 mg/kg (lead), ND-0.968 mg/kg (cadmium). The concentrations of benzo(a)pyrene ranged from $0.280-0.880{\mu}g/kg$. Paralytic shellfish poison ranged from ND-0.58 mg/kg, while diarrhetic shellfish poison was not detected. No radioactivity was detected. These results suggest that oysters intended for raw consumption or use in seafood products should be subjected to chemical and biological controls.