• Nutrition Research and Practice
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• 제9권6호
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• pp.592-598
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• 2015

BACKGROUND/OBJECTIVES: Increased mass of adipose tissue in obese persons is caused by excessive adipogenesis, which is elaborately controlled by an array of transcription factors. Inhibition of adipogenesis by diverse plant-derived substances has been explored. The aim of the current study was to examine the effects of the aqueous methanol extract of laver (Porphyra yezoensis) on adipogenesis and apoptosis in 3T3-L1 adipocytes and to investigate the mechanism underlying the effect of the laver extract. MATERIALS/METHODS: 3T3-L1 cells were treated with various concentrations of laver extract in differentiation medium. Lipid accumulation, expression of adipogenic proteins, including CCAAT enhancer-binding protein ${\alpha}$, peroxisome proliferator-activated receptor ${\gamma}$, fatty acid binding protein 4, and fatty acid synthase, cell viability, apoptosis, and the total content and the ratio of reduced to oxidized forms of glutathione (GSH/GSSG) were analyzed. RESULTS: Treatment with laver extract resulted in a significant decrease in lipid accumulation in 3T3-L1 adipocytes, which showed correlation with a reduction in expression of adipogenic proteins. Treatment with laver extract also resulted in a decrease in the viability of preadipocytes and an increase in the apoptosis of mature adipocytes. Treatment with laver extract led to exacerbated depletion of cellular glutathione and abolished the transient increase in GSH/GSSG ratio during adipogenesis in 3T3-L1 adipocytes. CONCLUSION: Results of our study demonstrated that treatment with the laver extract caused inhibition of adipogenesis, a decrease in proliferation of preadipocytes, and an increase in the apoptosis of mature adipocytes. It appears that these effects were caused by increasing oxidative stress, as demonstrated by the depletion and oxidation of the cellular glutathione pool in the extract-treated adipocytes. Our results suggest that a prooxidant role of laver extract is associated with its antiadipogenic and proapoptotic effects.

• Preventive Nutrition and Food Science
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• 제19권1호
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• pp.40-48
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• 2014

Laver is one of the most consumed edible red algae seaweeds in the genus Porphyra. Laver is primarily prepared in the form of dried, roasted, and seasoned products. We investigated the total polyphenol and flavonoid contents of laver products, and evaluated the in vitro antioxidant properties of solvent extracts from commercially processed laver products. Significant differences in the concentration of phenolic compounds were found among differently processed laver. The total phenolic content for laver extracts ranged from 10.81 mg gallic acid equivalent (GAE)/g extract to 32.14 mg GAE/g extract, depending on extraction solvent and temperature. Laver extracts contained very few flavonoids (0.55 mg catechin equivalent/g extracts to 1.75 mg catechin equivalent/g extracts). 2,2-Diphenyl-1-picrylhydrazyl (DPPH), 2,2'-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS), hydroxyl radical, and superoxide anion scavenging assays were used to determine the radical scavenging capacities of laver extracts. These assays revealed that the processing method and extraction condition affected the antioxidant potentials of laver. Antioxidant activity of dried laver, roasted laver, and seasoned laver increased in a concentration-dependent manner ($100{\sim}1,000{\mu}g/mL$). The radical scavenging activities of $37^{\circ}C$ and $100^{\circ}C$ water extracts were lower than that of a $37^{\circ}C$ 70% ethanol extract. The highest radical scavenging capacity was observed in the $37^{\circ}C$ 70% ethanol extracts of dried laver, roasted laver, and seasoned laver. Overall, these results support that notion that laver contains bioactive compounds, such as polyphenols and flavonoids, which may have a positive effect on health.

• 한국수산과학회지
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• 제45권5호
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• pp.409-413
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• 2012

The physiological activities and amino acid compositions of dried lavers of Porphyra from the Jangheung, Seochen and Haenam coasts were determined. The ethanol extract of the Haenam dried laver exhibited the greatest 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity (56.1%), ferric-reducing antioxidant potential (FRAP) value(86.5 mM) and total polyphenol content (3.51 ppm) of these dried laver products. In addition, there was a strong positive correlation between the antioxidative activity and total polyphenol content of the laver products, suggesting that polyphenol compounds contribute to the antioxidant capacity in the ethanol extract of dried laver. However, there was no difference among the extracts in terms of cell proliferation activity. Fourteen combined amino acids were identified in oligopeptides from the dried laver products. Of the three extracts, that of the Haenam dried laver contained the highest levels of both free and total amino acids including alanine, glutamic acid, taurine, phosphoserine, and aspartic acid.

• Environmental Analysis Health and Toxicology
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• 제14권3호
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• pp.75-79
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• 1999

Due to increasing marine pollution there is a great possibility that seaweed is contaminated with polycyclic aromatic hydrocarbons (PAHs). To investigate the effect of processing on PAM removal from Porphyra tenera (laver) contaminated PAH, laver was contaminated with fluoranthene known to have a strong photoinduced toxicity, followed by washings and drying, which are usual processes for dried laver preparation. Sample at each step was collected and its toxicity was evaluated using cultured animal cells as well as analyzing PAH contents. Fluoranthene level in laver was significantly lowered by sequential washings with sea water and distilled water, but not by drying. Fluoranthene content in raw laver right after contamination was 221 ppm and decreased to 130 ppm by washings with seawater plus distilled water while its level was not lurker lowered by drying process. Cytotoxicity and photoinduced cytotoxicity in mammalian cells were significantly elevated in laver extracts containing fluoranthene. Cellular arylhydrocarbon hydroxylase (AHH), one of the biomarkers for cellular accumulation of PAH, was greatly induced by laver extract contaminated with fluoranthene. These results suggest that photoinduced toxicity and AHH activity can be used to monitor contamination of seafood by PAHs. Fluoranthene accumulated in laver was efficiently removed by sequential washings with seawater and tap water for 24 hrs and 12 hrs, respectively.

• 한국식품영양학회지
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• 제18권1호
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• pp.11-18
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• 2005

Angiotensin Ⅰ converting enzyme(ACE) inhibitory activities of laver(Porphyra tenera) protein hydrolysates were investigated by enzymes used for hydrolysis, molecular fractions and drying methods. For the enzymatic hydrolysis, crude laver protein, separated by filtration of water extract of dried laver extracted with 20 times(w/v) water for 3 hours at boiling temperature, were hydrolyzed with three commercial protease, Pepsin, alcalase and maxazyme NNP at optimal conditions. The yield of hydrolysis and ACE inhibitory activities of which were high in order of pepsin, alcalase and maxazyme NNP. ACE inhibitory activities of laver hydrolysates by molecular levels were high in order of 3 kDa > 10 kDa > 3∼10 kDa, and the IC/sub 50/ ACE inhibitory activities by molecular lebels were 4 mg/mL(3 kDa), 5 mg/mL(total hydrolysate), and 20 mg/mL(10 kDa), respectively. The storage stability of dried laver hydrolysates at 20℃ were strongly affected by drying methods, hot air dried of which were much stabler than freeze-dried one.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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• pp.359-362
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• 2004

In multi-dimensional image, ICA-based feature extraction algorithm, which is proposed in this paper, is for the purpose of detecting target feature about pixel assumed as a linear mixed spectrum sphere, which is consisted of each different type of material object (target feature and background feature) in spectrum sphere of reflectance of each pixel. Landsat ETM+ satellite image is consisted of multi-dimensional data structure and, there is target feature, which is purposed to extract and various background image is mixed. In this paper, in order to eliminate background features (tidal flat, seawater and etc) around target feature (laver farm) effectively, pixel spectrum sphere of target feature is projected onto the orthogonal spectrum sphere of background feature. The rest amount of spectrum sphere of target feature in the pixel can be presumed to remove spectrum sphere of background feature. In order to make sure the excellence of feature extraction method based on ICA, which is proposed in this paper, laver farm feature extraction from Landsat ETM+ satellite image is applied. Also, In the side of feature extraction accuracy and the noise level, which is still remaining not to remove after feature extraction, we have conducted a comparing test with traditionally most popular method, maximum-likelihood. As a consequence, the proposed method from this paper can effectively eliminate background features around mixed spectrum sphere to extract target feature. So, we found that it had excellent detection efficiency.

• 한국식품조리과학회지
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• 제14권1호
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• pp.119-123
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• 1998

5종의 식품부패미생물에 대한 파래의 메탄을 추출물의 항균성을 검색한 결과 1000 $\mu\textrm{g}$/ml의 농도에서 L. monocytogenes를 제외하고는 모두 완전히 성장을 저해하였으며, 특히 V parahaemolyticus는 500 $\mu\textrm{g}$/ml에서도 완전히 저해되었다. 또한 인공합성보존제로 사용되고 있는 sodium propionate의 B. subtilis, E. coli, S. aureus, L. monocytogenes, V parahaemozyticus에 대한 항균력을 살펴본 결과, 3% 수준의 농도수준에서 모든 균의 증식이 완전히 억제되었다. 파래를 첨가한 묵을 제조하여 총 세균수를 측정한 결과, 묵의 총 세균수가 저장 7일 후의 대조군의 $10^{*}$ 6 CFU/g에 비해 파래 5, 10, 15, 20% 첨가군은 $10^{*}$ 5 CFU/g으로 대조군의 3일 저장 후의 총세균의 수준으로 감소됨을 보였다. 또한 첨가한 묵의 관능평가를 실시한 결과, 색과 향은 5, 10, 15% 첨가군이 대조군과 유의적인 차이가 없었고, 촉촉한 정도는 20% 첨가군이 가장 높았으며, 탄력성은 5% 첨가군과 대조군의차이가 없었다. 또한 삼킨후의 느낌은 대조군과 각 첨가군 사이에 차이가 없었고 전반적인 바람직한 정도는 5% 첨가군이 대조군보다 높게 평가되었다. 이상의 결과를 종합해 볼 때, 파래는 식품부패미생물에 대한 높은 항균성을 지니고 있으며, 파래를 묵에 첨가했을 때 저장성이 향상되었고 관능적 특성에 있어서도 바람직하게 평가되었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.421-425
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• 2006

This study was to propose the spatial analysis method of extracting the spectral characteristic of cultural grounds of lavers in marine especially ApHae-myeon, ShinAn-gun, JellaNam-do, through using various satellite images. In addition, the information of cultural grounds of laver such as the existence of illegal cultural grounds of laver distribution was extracted through using satellite images and GIS analysis methods. For the further work, the spatial analysis to extract not only cultural grounds of laver business but also artificial facilities in marine will be proposed.

• 한국수산과학회지
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• 제51권5호
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• pp.510-517
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• 2018

The study investigated the seasonal and regional changes in the food components of raw laver Pyropia sp.. Samples were obtained monthly from December 2017 to March 2018 at auction markets located in Gangseo-gu, Busan (Nakdong-raw laver), Seocheon-gun, Chungnam, Wando-gun, Jeonnam and Goheung-gun, Jeonnam. The general components, heavy metals and minerals, free amino acids, total phenolic compounds (TPC), and antioxidant activities of the samples were analyzed. No significant physicochemical changes in the moisture, crude lipid, and ash contents were observed in the raw lavers tested. However, the crude protein content of Nakdong-raw laver was the highest in December 2017 at $7.20{\pm}0.28%$ and the content was higher seasonally and regionally than those of the other raw lavers. In addition, the taurine, zinc, manganese and TPC contents of Nakdong-raw laver was higher seasonally and regionally than those of the other raw lavers. The ethanolic extract of Nakdong-raw laver also had higher antioxidant activity, including as DPPH (2,2'-diphenyl-1-picrylhydrazyl) and ABTS (2,2'-azino-bis [3-ethylbenzothiazoline-6-sulphonic acid]) radical scavenging activity, although there was no significant correlation between TPC and the antioxidant activity. This study is the first analysis of seasonal and regional changes in the major food components of raw laver cultivated in Korea.

• 한국식품영양과학회지
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• 제42권12호
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• pp.1893-1898
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• 2013

우리나라에서 소비량인 높은 대표적인 해조류인 김, 미역, 다시마 및 톳을 이용하여 추출물을 제조하여 추출물의 추출수율, 색도, 총 페놀 함량, DPPH 라디칼 소거능 및 ABTS 라디칼 소거능을 분석하였고, 추출물의 지질산화 억제능 및 tyrosinase 억제활성을 분석하였다. 용매를 이용하여 김, 미역 다시마 및 톳의 추출물 수율은 3.00, 5.38, 11.73 및 0.72%를 나타내었고, 색도 분석 결과 김, 미역, 다시마 및 톳 추출물의 명도는 82.88, 78.53, 83.04 및 78.11로 다시마 추출물의 명도가 가장 밝은 것으로 나타났으나 김 추출물의 명도와 유의적 차이는 나타나지 않았다. 총 페놀 함량은 김, 미역, 다시마 및 톳 추출물이 각각 42.23, 11.59, 10.09 및 46.59 mg/g으로 나타냈다. DPPH 라디칼의 경우 톳 추출물이 82.43%로 가장 높은 라디칼 소거능을 나타냈으며 김 추출물의 경우 26.76%의 라디칼 소거능을 확인하였다. ABTS 라디칼 소거능의 경우 DPPH 라디칼 소거능 결과와 유사한 경향을 나타내었다. 또한 해조류 추출물의 tyrosinase inhibition effect 결과는 김, 미역, 다시마 및 톳 추출물의 tyrosinase inhibition이 각각 25.93, 26.32, 24.76 및 20.24%의 활성을 나타냈으며 유의적인 차이는 나타내지 않는 것으로 확인하였다. 해조류 추출물의 총 페놀화합물, DPPH 라디칼 소거능, ABTS 라디칼 소거능 및 미백활성에 대한 상관분석 결과 해조류 추출물의 총 페놀 함량은 DPPH 및 ABTS 라디칼 소거능의 결과 값과 P<0.001 수준에서 유의적으로 상관관계를 나타내는 것으로 확인되었다.