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Eunbin Lee,Jungil Hong 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Riboflavin (Rb, vitamin B₂) in the presence of methionine (Met) generates superoxide anion radical under light and reduces nitro blue tetrazolium (NBT) to its corresponding formazan. Due to this characteristic, the Rb/NBT/Met system has been used for measuring the superoxide dismutase-like activity of various antioxidants. However, the role of Met in NBT reduction by photo-stimulated Rb has not been clearly identified. In the present study, changes in NBT reduction patterns by different types of photosensitizers including Rb, zinc protoporphyrin, protoporphyrin IX, erythrosin B, and methylene blue (MB) were analyzed in the presence of different amino acids including Met, histidine (His), and tryptophane. Among the photosensitizers, MB showed the most potent NBT reducing activity in the presence of His in Tris (pH 7.5) buffer. Each of 3 amino acids induced the NBT reduction by Rb in phosphate (pH 7.4) buffer; NBT reduction by Rb in the presence of His was observed only in Tris. The present results indicate that the NBT reduction was more prominent in the MB/His reaction system than in the conventional Rb/Met system; their reaction mechanisms need to be further explored.
Quality Characteristics of Korean Sponge Cake Containing Pinus koraiensis Powder
Eunbin Park,Soo In Ryu,Minho Lee,Hyo-Jeong Lee,Jean Kyung Paik 한국조리학회 2024 한국조리학회지 Vol.30 No.2
As the dessert market grows, the number of consumers who want to consume healthy and diverse desserts increases. Therefore, there is a need to develop differentiated products to suit this trend. Pinus koraiensis powder has anti-inflammatory, antioxidant, antihypertensive, and antibacterial activities. The sponge cakes were manufactured with 0%, 1%, 3%, 5%, or 7% P. Koraiensis powder and evaluated for quality characteristics. The L- and b-values decreased significantly as the amount of added powder increased (p<0.001). However, the a-value increased significantly (except for the cake with 7% powder) as the amount of added powder increased (p<0.001). Hardness and chewiness decreased significantly as the amount of powder increased (p<0.001). The total polyphenol content, DPPH, and ABTS radical scavenging activities increased significantly as the amount of added powder increased (p<0.001). Thus, sponge cakes with excellent physical properties and antioxidant effects were developed with the addition of P. Koraiensis powder. In addition, we aimed to use this as basic data for research on healthy bread containing P. Koraiensis powder.
카로티노이드류 색소의 피부 및 면역 세포 증식과 염증조절 활성
이은빈(Eunbin Lee),홍정일(Jungil Hong) 한국식품과학회 2022 한국식품과학회지 Vol.54 No.5
본 연구에서는 식품 중에 다양한 색소로 이용되는 annatto (norbixin), bixin, crocin 과 lutein 등의 카로티노이드가 각종 피부세포의 성장 및 염증에 미치는 영향과 단핵구 세포의 면역조절 활성을 검토하였다. Norbixin과 bixin 은 피부의 탄력을 유지시키는데 중요한 역할을 수행하는 진피층 fibroblast의 활성과 증식을 촉진하였고, 각종 자극이나 건선 등으로 유발될 수 있는 keratinocyte의 과다증식을 억제하였다. Lutein을 제외한 3종의 카로티노이드는 PMA에 의해 유도된 keratinocyte에서 염증성 cytokine 발현을 유의적으로 억제하는 것으로 나타났다. Lutein의 경우 fibroblast의 증식 억제 및 장기간 처리에 의한 keratinocyte의 증식 유도 현상을 보였으며, 특히 단핵구의 대식세포로의 분화과정을 효과적으로 저해하였다. 본 연구에서는 카로티노이드에 의한 피부세포의 성장 및 염증활성 조절, 그리고 단핵구 분화 등 면역세포 활성화에 미치는 영향 등을 평가하였으며, 카로티노이드 식품 색소성분들의 피부용 제제로의 활용을 위한 기초자료를 제공할 수 있을 것으로 기대한다. Carotenoids have shown various beneficial health effects in humans. In this study, the effects of dietary carotenoids, including norbixin (annatto), bixin, crocin, and lutein, on skin cell proliferation and inflammation, and monocyte differentiation were investigated. None of the carotenoids affected the growth of human keratinocyte (HaCaT) during 24 h, whereas annatto and bixin stimulated proliferation of human dermal fibroblast (HDF). Long-term treatment (7 d) of annatto and bixin inhibited keratinocyte growth, whereas lutein enhanced keratinocyte growth. All carotenoids, except lutein, decreased mRNA levels of pro-inflammatory cytokines, including TNF-α, IL-1β, and IL-8, in phorbol-12- myristate-13-acetate (PMA)-stimulated keratinocytes. However, bixin and lutein inhibited PMA-induced HaCaT growth. Monocyte (THP-1) differentiation induced by PMA was also inhibited by the carotenoids, and lutein showed the strongest inhibitory effect. These results suggest that carotenoids modulate the proliferation and inflammatory responses of skin cells and monocytes.