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지식채널

• 논문정보

  검색결과 3건

  논문정보 목록 - 제목, 내용, 저자, 저널명/발행자, 상세보기

  제목	내용	저자	저널명/발행자	상세보기
  Red seaweed extracts reduce methane production by altering rumen fermentation and microbial composition in vitro	A series of in vitro batch culture incubations were carried out to investigate changes in rumen fermentation characteristics, methane (CH4) production, and microbial composition in response to supplementation with five different red seaweed species (Amphiroa anceps, AANC; Asparagopsis taxiformis, ATAX; Chondracanthus tenellus, CTEN; Grateloupia elliptica, GELL; and Gracilaria parvispora, GPAR). Prior to the incubations, the total flavonoid and polyphenol content of the red seaweed extracts was quantified. The incubated substrate consisted of timothy hay and corn grain [60:40 dry matter (DM) basis]. Treatments were substrate mixtures without seaweed extract (CON) or substrate mixtures supplemented with 0.25 mg/mL of red seaweed extract. Samples were incubated for 6, 12, 24, 36, and 48 h. Each sample was incubated in triplicates in three separate runs. In vitro DM degradability, fermentation parameters (i.e., pH, volatile fatty acids, and ammonia nitrogen), total gas production, and CH4 production were analyzed for all time points. Microbial composition was analyzed using 16S rRNA amplicon sequencing after 24 h of incubation. The highest CH4 reduction (mL/g DM, mL/g digested DM, and % of total gas production) was observed in ATAX (51.3, 50.1, and 51.5%, respectively, compared to CON; P < 0.001) after 12 h of incubation. The other red seaweed extracts reduced the CH4 production (mL/g DM; P < 0.001) in the range of 4.6-35.0% compared to CON after 24 h of incubation. After 24 h of incubation, supplementation with red seaweed extracts tended to increase the molar proportion of propionate (P = 0.057) and decreased the acetate to propionate ratio (P = 0.033) compared to the CON. Abundances of the genus Methanobrevibacter and total methanogens were reduced (P = 0.050 and P = 0.016) by red seaweed extract supplementation. The linear discriminant analysis effect size (P < 0.05, LDA ≥ 2.0) showed that UG Succinivibrionaceae, Anaeroplasma, and UG Ruminococcaceae, which are associated with higher propionate production, starch degradation, and amylase activity were relatively more abundant in red seaweed extracts than in the CON. Our results suggest that supplementation with red seaweed extracts altered the microbiota, leading to the acceleration of propionate production and reduction in CH4 production.	Choi, Youyoung,Lee, Shin Ja,Kim, Hyun Sang,Eom, Jun Sik,Jo, Seong Uk,Guan, Le Luo,Park, Tansol,Seo, Jakyeom,Lee, Yookyung,Bae, Dongryeoul,Lee, Sung Sill	Frontiers Media SA	상세보기
  Gracilaria spp. extract 항산화 활성	This study examined antioxidant activity for use as a cosmetic material Gracilaria Incurvata, Gracilaria parvispora, and Gracilaria vermiculophylla among the red algae widely used as edible seaweed. For antioxidant activity measurement, extracts were diluted with 70% ethanol to manufacture extracts. In DPPH radical scavenging activity assays, Gracilaria vermiculophylla extract showed the highest figure at 97.27±1.05%. In ABTS radical scavenging activity assays, Gracilaria vermiculophylla extract showed the highest figure at 47.67±2.78%. In total phenolic contents measurement results, Gracilaria vermiculophylla extract showed the highest figure at 75.60±1.40 mg gallic acid/g, but only in the NO radical scavenging activity assay, the Gracilaria incurvata extract showed the highest figure at 95.80±0.33%. As a result, Gracilaria vermiculophylla was the most likely to develop as a cosmetic material in the remaining three antioxidant activity measures in addition to NO radical scavenging activity.	강다미,강상모	한국미용학회	상세보기
  Arsenic and Nutrient Composition Across Different Edible Seaweeds From Hawaii	AbstractObjectives Seaweed is used for various cultural, culinary, and medicinal purposes in Hawaii and has been consumed for generations around the world (i.e., the Pacific, Asia, and parts of Europe). In the US, seaweed is gaining popularity because of its reputation for being highly nutritional. However, some types of seaweed are known to accumulate heavy metals, including inorganic arsenic (iAs) species. While some seaweed species have been studied, there is still limited species-specific compositional data. The purpose of this study was to quantify arsenic and nutrient (i.e., macronutrient and mineral) levels in edible seaweeds. Methods Brown algae (Sargassum aquifolium and Sargassum spp.), red algae (Gracilaria parvispora, Halymenia formosa, and Halymenia hawaiiana, and green algae (Ulva ohnoi) were analyzed using HPLC-ICP-MS for arsenic speciation. Proximate (protein, dietary fiber, ash, moisture, carbohydrate, crude fat, and crude protein) and mineral (P, K, Ca, Mg, Na, Fe, Mn, Zn, Cu, B) analyses were conducted. Values were expressed per freeze-dried weight (FDW) or fresh weight serving (FW) of seaweed. Results Brown algae had the highest concentration of total and iAs compared to all others. Statistical differences amongst macronutrients and minerals existed across seaweed species, with G. parvispora having higher Mn (∼510 μg/g FDW) and K (∼4.6 g/100g FDW) levels compared to all other samples (P < 0.05). Based on recommended nutritional daily values, G. parvispora (∼80 g FW) was high in Mn, H. formosa (∼100 g FW) was high in Fe, U. ohnoi (∼100 g FW) was high in Mg, and H. hawaiiana (∼100 g FW) was high in Mg, Fe, and Zn. Conclusions Overall, these findings indicate significant differences in composition across seaweed species. As some seaweeds were excellent sources of essential nutrients while others were high in iAs, it is critical to continually expand compositional data to assess both nutritional adequacy and safety of diets. Funding Sources USDA-ARS, FDA.	Kim, Samuel,Conklin, Sean,Redan, Benjamin,Ho, Kacie	Oxford University Press	상세보기

• 유용한 해양생물 이야기

  검색결과 1건

  유용한 해양생물 이야기 목록 - 학명, 국명, 생리활성, 원료등록, 특징/이용

  학명	국명	생리활성	원료등록	특징/이용
  Gracilaria parvispora	각시꼬시래기	항산화, 항균	식품원료 등록	식품원료 등록 등 재식이섬유, 칼슘, 철분 함량 풍부, 체내 중금속 배출 효과