• Fisheries and Aquatic Sciences
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• 제25권10호
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• pp.517-524
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• 2022

Over production of methylglyoxal (MGO) a highly reactive dicarbonyl compound, has been associated in progressive diabetes with vascular complication. Therefore, we investigated whether hot water extract of Loliolus beka meat (LBM-HWE) presents a preserve effect against MGO-induced cellular damage in human umbilical vein endothelial cells (HUVECs). The LBM-HWE extract showed to inhibit MGO-induced cytotoxicity. Additionally, the LBM-HWE reduced mRNA expression of pro-inflammatory cytokines, and reduced MGO-induced advanced glycation end product (AGEs) formation. Furthermore, LBM-HWE induced glyoxalase-1 mRNA expression and reduced MGO-induced carbonyl protein formation in HUVECs. The results implicate that LBM-HWE has protective ability against MGO-induced HUVECs toxicity by preventing AGEs formation. In conclusion, LBM-HWE could be used as a potential treatment material for the prevention of vascular complications of diabetes.

• Journal of the Korean Wood Science and Technology
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• 제42권2호
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• pp.207-213
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• 2014

This study was carried out to investigate the feasibility and usefulness of a commercial synthetic adsorbent, Diaion HP 20, for the isolation of proanthocyanidins (PAs) from hot water extract (HWE) prepared from Pinus radiata bark. Most ultraviolet (UV) absorbing materials in HWE were adsorbed onto Diaion HP 20 and easily recovered by simple ethanol (EtOH) washing. More than 50% of the UV absorbing materials were adsorbed within 20 minutes, and the adsorption equilibrium was reached within 3 h. The recovered materials from Diaion HP 20 were mostly composed of PAs, but some monomeric flavonoids such as taxifolin and unidentified hydrophobic materials were also adsorbed. The impurities such as carbohydrates and inorganic materials contained in HWE were mostly removed by Diaion HP 20. The adsorption ability of the UV absorbing materials onto Diaion HP 20 was almost the same as the first cycle even after 14 times of repeating cycles of adsorption and desorption. The radical scavenging ability of the recovered materials from the adsorbent was slightly higher than that of the pure PAs prepared by Sephadex LH 20 from the same HWE.

• 한국약용작물학회지
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• 제16권5호
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• pp.313-319
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• 2008

S. barbata의 열수 추출물 (Sb-HWE)은 대표적인 염증과정인 LPS에 의해 활성화된 대식세포로 부터의 NO생성, LPS 매개에 의한 세포사멸작용, 및 FITC-dextran의 대식세포내 탐식작용을 매우 효과적으로 억제하였다. 그러나 본 추출물은 SNP로 유도된 라디칼 소거능은 매우 미약한 것으로 나타났다. NF-${\kappa}B$-매개에 의한 루시퍼라제 활성, 및 NF-${\kappa}B$ 활성 관련 신호전달 단백질 (Akt 및 $I{\kappa}B{\alpha}$)에 대한 저해작용은 관찰되지 않은 것으로 보아 이들 추출물의 대식세포 면역반응 조절 기전은 기존의 알려진 방법과는 다른 기전에 의해 진행되는 것으로 판단된다.

• Food Science and Biotechnology
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• 제16권5호
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• pp.728-733
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• 2007

Bamboo grass, Sasa quelpaertensis, is a native plant to Jeju Island, Korea. The leaves of Sasa plants are widely used in traditional Korean medicine to treat inflammation-related diseases. We investigated the effect of hot water extract from Sasa quelpaertensis leaves (HWE-SQ) on nitric oxide (NO) production and nuclear $factor-{\kappa}B\;(NF-{\kappa}B)$ activation in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. HWE-SQ inhibited LPS-induced NO production and inducible NO synthase (iNOS) protein expression in a dose-dependent manner. Reporter gene assays indicated that HWE-SQ decreases LPS-induced $NF-{\kappa}B$ transcriptional activation. However, HWE-SQ did not affect the phosphorylation and degradation of inhibitory ${\kappa}B{\alpha}\;(1{\kappa}B{\alpha})$. HWE-SQ also directly inhibited iNOS enzyme activity in a dose-dependent manner. These results suggest that HWE-SQ suppresses NO synthesis in macrophages by attenuating $NF-{\kappa}B-mediated$ iNOS protein expression and inhibiting iNOS enzymatic activity, thereby implicating a mechanism by which HWE-SQ is able to ameliorate inflammation-related diseases by limiting excessive or prolonged NO production in pathological events.

• 한국식품조리과학회지
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• 제28권1호
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• pp.25-32
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• 2012

This study was carried out to evaluate biological activities concerning extracts according to extraction methods from unripened fruit of Rubus coreanus Miq. The extraction methods were HWE (hot water extraction for 4 hr at $100^{\circ}C$), SFE (extraction for 3 hr at $40^{\circ}C$ under 300 bar, 100% of $CO_2$ fluid), USE (ultrasonification extraction for 4 hr at $50^{\circ}C$ with water), USE+HWE (hot water extraction for 2 hr at $100^{\circ}C$ after ultrasonification process for 2 hr), VE (vacuum extraction for 4 hr at $90^{\circ}C$ under 0.9 bar with water). VE extract showed the highest contents of total polyphenol ($178.78{\pm}3.79\;mg/g$) and total flavonoid ($40.93{\pm}0.68\;mg/g$). $IC_{50}$ values of DPPH radical scavenging activity, linoleic acid peroxidation inhibition activity and LDL (low density lipoprotein) oxidation inhibition activity of HWE extract showed the lowest $35.39{\pm}0.25{\mu}g/mL$, $12.61{\pm}0.31{\mu}g/mL$ and $1.31{\pm}0.02{\mu}g/mL$ among other all extracts, respectively. $IC_{50}$ values of ${\alpha}$-glucosidase inhibitory activities of VE and HWE extracts showed lower $14.34{\pm}0.20{\mu}g/mL$ and $15.83{\pm}0.20{\mu}g/mL$ than those of other extracts, respectively. Specifically, HWE and VE extracts have relatively better biological activities than other extracts; these could be potentially used as a bioactive source for health functional foods.

• Nutrition Research and Practice
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• 제5권4호
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• pp.281-287
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• 2011

In this study, we evaluated the antioxidant activity of pine needle extracts prepared with hot water, ethanol, hexane, hot water-hexane (HWH), and hot water-ethanol (HWE), using the DPPH (1,1-diphenyl-2-picrylhydrazyl) radical method. The hot water extract possessed superior antioxidant activity than the other extracts. We also compared the antioxidant activity of pine needle extracts through ROS inhibition activity in a cellular system using MC3T3 E-1 cells. The hot water extract exhibited the lowest ROS production. The pattern of HPLC analysis of each extract indicated that the hot water extract contained the highest proanthocyanidin level. The pine needle hot-water extract was then isolated and fractionated with Sephadex LH-20 column chromatography to determine the major contributor to its antioxidant activity. The No.7 and 12 fractions had high antioxidant activities, that is, the highest contents of proanthocyanidins and catechins, respectively. These results indicate that the antioxidant activity of procyanidins from the hot water extract of pine needles is positively related to not only polymeric proanthocyanidins but also to monomeric catechins. Moreover, the antioxidant activity of the pine needle hot water extract was similar to well-known antioxidants, such as vitamin C. This suggests that pine needle proanthocyanidins and catechins might be of interest for use as alternative antioxidants.

• 한국식품영양학회지
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• 제14권6호
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• pp.543-547
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• 2001

전통 한약재인 황기. 당귀로부터 추출물의 획득은 일반적으로 열수 추출법에 의하여 행해져 왔으나 추출물의 획득수율이 낮고 추출, 농축과정에서의 심한 열처리로 인하여 고유의 향이 소실되는 등 많은 문제점을 안고 있다 이에 본 연구에서는 주정추출법을 시도하여 황기, 당귀 추출물의 획득수율을 열수 추출법의 50, 39% (w/w) 대비 각각 15, 36% 증가한 65, 75%로 향상시킬 수 있었으며, 강한 고유의 향을 포집하고 있는 전혀 새로운 타입의 추출물을 얻을 수 있었다. 추출과정에서 열수 추출법과의 차이는 추출용매를 물에서 주정으로 변경한 것과 1차 추출 후 얻어진 박을 이용하여 2차 추출을 행하였으며, 농축온도를 열수 추출의 104$^{\circ}C$에 비하여 상대적으로 낮은 9$0^{\circ}C$에서 실시하였다. 이와 같이 처리온도와 거의 무관하게 주정은 고유의 향을 포집하는 뛰어난 효과를 나타내었다. 이 추출물을 물엿, 음료 등의 제품에 적용할 경우별도의 인공향료 처리없이 천연물 그대로의 가공으로도 충분한 고유의 향미를 부여할 수 있을 것으로 기대 된다.

• 대한의생명과학회지
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• 제15권4호
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• pp.335-342
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• 2009

This study was investigated to evaluate the contents of polyphenols and flavonoids, and physiological activities of various extracts from Calystegia japonica roots for making good use of their functional materials. The roots of C. japonica were extracted with water (WE), ethanol (EE) and hot water (HWE) by different methods. Among these extracts, the highest extracting yield was 30.30% of HWE, while the highest contents of total polyphenols and flavonoids were 40.85% and 6.40% of WE, respectively. The nitrite scavenging abilities were ranged from 31.31% (HWE) to 37.46% (EE) at pH 1.2 and 1.0 mg/ml concentration. In the measurements of electron donating abilities, EE showed the highest effect as 91.83% at 0.3 mg/ml assay concentration, and the electron donating ability was decreased as the extract concentration was increased. In the results of superoxide dismutase (SOD)-like activity, HWE showed the highest effect as 7.15% at 1.0 mg/ml. The tyrosinase inhibition activities of WE and EE were 15.28% and 14.97%, respectively. The xanthine oxidase inhibitory effects were ranged from 97.50 to 99.28% at 1.0 mg/ml. These results indicate that C. japonica extract has a good antioxidant effects and could be useful for developing functional products.

• Journal of Microbiology and Biotechnology
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• 제30권8호
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• pp.1116-1123
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• 2020

Velvet antler (VA) is a historically traditional medicinal supplement and is well known in Asian countries for its pharmaceutical and health benefits. The objectives for this study were to optimize the hot water extraction (HWE) of VA for the Korean VA industry, and to determine the most effective pretreatment method among microwave (MW), ultrasonication (US), and enzymatic (EZ) techniques. Using response surface methodology, optimum extraction temperatures and times were determined by central composite design configuration based on extraction yield and sialic acid content. Various quality parameters of VA extract including yield, soluble solid, protein, and sialic acid contents were also compared with the conjunction of HWE and pretreatment. The yield and sialic acid content of VA extract were determined to be 40% and 0.73 mg/g, respectively, under an optimum temperature of 100℃ at 24 h of extraction time. The yields from VA extracts pretreated with MW, US, and EZ were 17.42%, 19.73%, and 29.15%, respectively. Among the tested commercial enzymes, pepsin was the most effective proteolytic enzyme and led to the highest yield (47.65%), soluble solids (4.03 °brix), protein (1.12 mg/ml), and sialic acid (3.04 mg/ml) contents from VA extract.

• 한국식품저장유통학회지
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• 제24권6호
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• pp.834-841
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• 2017

본 연구는 대표적인 산채지역으로 알려져 있는 영양군 곰취 열수추출물의 총 폴리페놀 함량과 DPPH 라디컬 소거능을 측정하였으며 사람 비만세포주인 HMC-1 세포를 이용하여 PMACI을 처리하여 비만세포를 활성화시켜 세포 생존률을 확인하였고, 염증성 사이토카인인 $TNF-{\alpha}$, IL-6, IL-8의 변화량을 측정하여 곰취의 기능성 식품 소재로서의 이용 가능성을 알아보고자 실험을 실시하였다. 영양군 곰취 열수 추출물의 추출수율은 원물 건조량 대비 $24.43{\pm}1.82%$(w/w), 총 폴리페놀 함량은 $198.07{\pm}0.24mg/g$으로 다른 곰취 추출물의 연구결과와 유사한 값을 나타내고, 영양군 곰취 열수 추출물의 DPPH radical 소거 활성을 측정한 결과, $IC_{50}$ 값이 $28.2{\pm}0.04{\mu}g/mL$로 양성대조군인 ascorbic acid의 $IC_{50}$ 값 $3.5{\pm}0.01{\mu}g/mL$보다 낮은 항산화활성을 보였으나 일반 천연물 유래 추출물보다 비교적 높은 항산화활성을 나타내었다. 영양군 곰취 열수 추출물을 HMC-1 세포에 처리했을 때 MTT assay법으로 분석한 결과, 세포 생존률에는 아무런 영향을 미치지 않고, $TNF-{\alpha}$, IL-6, IL-8 생성에 대한 억제효과는 유의성 있게 나타났다. 이상의 결과를 종합해 보면 항산화력 및 세포를 이용한 in vitro 실험을 실시한 결과 영양군 곰취 열수 추출물은 항산화력이 매우 우수할 뿐만 아니라 항염증효과도 뛰어나 향후 기능성 소재로서의 이용 가능성이 높은 것으로 판단되나 보다 다양하고 진보된 연구로 곰취의 염증성 질환 치료에 대한 정확한 기전이 설명되어야 할 것이다.