농업생명환경연구 · 강원대학교 농업생명과학대학 농업생명과학연구원

Review Article

Literature Review on Microbial Surfactants
미생물이 생산하는 계면활성제에 대한 문헌 연구

Se-Young Kwun, Do-Hoon Yoo, Eun-Hee Park, Myoung-Dong Kim
권세영, 유도훈, 박은희, 김명동

Surfactants are compounds that reduce the surface and interfacial tension between liquids. They are used in various industries, such as pharmaceutical, food ... + READ MORE

Surfactants are compounds that reduce the surface and interfacial tension between liquids. They are used in various industries, such as pharmaceutical, food, and cosmetic industries. However, as surfactants are produced from petroleum, they are toxic and non-biodegradable. Biosurfactants have been considered for a wide range of industrial applications because of their biodegradability and low toxicity. Here, we reviewed recent studies on the production and applications of biosurfactants. Microorganisms produce various types of biosurfactants, such as glycolipids, lipopeptides, and high-molecular-weight polymers. Carbon and nitrogen sources, in addition to culture conditions such as temperature and medium acidity, profoundly influence the production of biosurfactants. Additionally, recombinant microbial strains harboring biosynthetic genes for biosurfactant production have been reported. Furthermore, biosurfactants are paving their way for oil recovery, food additives, and remediation of soil. Reduction in biosurfactant production costs will enable their application in a broad range of areas. - COLLAPSE

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March 2021
Research Article

Characteristics of the Yeast Starmerella vaccinii Isolated from Dianthus chinensis
패랭이꽃으로부터 분리한 효모 Starmerella vaccinii 균주 특성

Jeong-Ah Yoon, Jung-Un Kim, So-Hee Shin, Myoung-Dong Kim
윤정아, 김정운, 신소희, 김명동

Two hundred and fifty-eight strains of yeast were isolated from wild flowers collected in Chuncheon, Gangwon Province, Korea. The MBY/L7303 strain ... + READ MORE

Two hundred and fifty-eight strains of yeast were isolated from wild flowers collected in Chuncheon, Gangwon Province, Korea. The MBY/L7303 strain from Dianthus chinensis showed remarkable growth in medium supplemented with glucose, xylose, cellobiose, and galactose as the carbon source. This strain was identified as Stamerellera vaccinii, and its 26S rRNA gene sequence was registered in GenBank (MW465704). The S. vaccinii MBY/L7303 utilized glucose, cellobiose, sucrose, galactose, xylose, xylan, and starch as carbon sources and did not produce ethanol. The strain grew to a maximum cell density (OD₆₀₀) of 21.93 ± 0.09 in the cellobiose-supplemented medium. The highest specific growth rate was 0.41 ± 0.00 1/h at pH 5.0 and 30°C. These results serve as valuable information for the potential industrial application of S. vaccinii. - COLLAPSE

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March 2021
Research Article

Willingness to Pay for Bioplastic Packaged Home Meal Replacement

Seon Jin Hwang, Se Min Lee, Ho In Lee, Jeong Gi Kim, Sang Hyeon Lee

The purpose of this study is to estimate the economic value of bioplastic packaged Home Meal Replacement (HMR) using respondents’ willingness to ... + READ MORE

The purpose of this study is to estimate the economic value of bioplastic packaged Home Meal Replacement (HMR) using respondents’ willingness to pay (WTP). In particular, how much consumers are willing to pay if bioplastic packaging is used for HMR lunch boxes that commonly use plastic packaging was answered. A total of 208 respondents with experience in purchasing HMR were surveyed online using the Contingent Valuation Method (CVM). This study uses double-bounded dichotomous choice to reduce errors and increase statistics’ efficiency. According to this analysis, the CVM estimates the consumer value of the bioplastic packed lunch boxes’ premium is 11.4% higher than regular plastic packed lunch boxes. Additionally, the respondent's gender and the type of HMR products they frequently purchase affect the WTP value. This study’s results serve as referential data on investments in eco-friendly materials for food enterprises marketing decisions. - COLLAPSE

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March 2021
Research Article

Quality Characteristics of White Pan Bread Supplemented with Black Rice Bran Powder
흑미미강을 이용한 제빵특성 연구

Sung-Jin Park
박성진

In this study, white pan bread supplemented with black rice bran powder (BRP; 0%, 5%, 10%, 15%, and 20%) was prepared by ... + READ MORE

In this study, white pan bread supplemented with black rice bran powder (BRP; 0%, 5%, 10%, 15%, and 20%) was prepared by the straight dough method, and its quality and antioxidant characteristics were analyzed. Compared with control, an increase in the weight and volume and a decrease in the moisture content of the bread added with BRP were observed. Increasing the amount of BRP in white pan bread decreased lightness and yellowness in color values, whereas redness value was increased. Texture analysis revealed an increase in gumminess and chewiness of the white pan bread after BRP addition. An increase in the total polyphenol content of the white pan bread supplemented with BRP was observed [4.52–12.67 mg gallic acid equivalents (GAE)/g] compared with the control (1.87 mg GAE/g). An increase in 2,2-diphenyl-1-picrylhydrazyl free radical scavenging activity (24.31%) was observed in white pan bread with the addition of BRP up to 20% compared with control. In conclusion, white pan bread supplemented with 15% BRP yielded the best quality bread. - COLLAPSE

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March 2021
Research Article

Effects of Packaging Films on Fruit Quality and Storability of “Kumsil” and “Kingsberry” Strawberries during Modified Atmosphere Storage
“금실” 및 “킹스베리” 딸기의 MA저장 시 필름이 품질에 미치는 영향

Minwoo Baek, Shimeles Tilahun, Han-Ryul Choi, Jung-Soo Lee, Cheonsoon Jeong
백민우, 시멜레스틸라훈, 최한률, 이정수, 정천순

The purpose of this study was to select packaging films and active modified atmosphere packaging (MAP) to maintain fruit quality and extend ... + READ MORE

The purpose of this study was to select packaging films and active modified atmosphere packaging (MAP) to maintain fruit quality and extend the shelf life of strawberry cultivars for export purposes. The best results for firmness, soluble solids content (SSC), titratable acidity (TA), and decay percentage were obtained from 30 µm (2,500 cc/m²·day·atm O₂ permeability) of oriented polypropylene (OPP) film, which was found to be suitable as MA packaging material for strawberries. After eight days of storage with active MAP with 5% and 10% CO₂, significant differences were observed between the tested cultivars. The firmness of “Kumsil” remained high in the range of 4.0–4.4 N, while “Kingsberry” was maintained around 2.8 N. The SSC was lower in the treatment groups than in the control, and lower in “Kingsberry” than in “Kumsil”. The TA also showed trends similar to those of SSC and was maintained at approximately 6.3 mg kg-1 in both the “Kumsil” and “Kingsberry” cultivars. The decay percentage of “Kumsil” was lower in the treatment groups (around 1.1%) than in the control (1.5%), and the lowest (0.8%) was observed in “Kingsberry”, with an active MAP at 10% CO₂. The overall sensory evaluation of sweetness, sourness, texture, freshness, and aroma showed the highest score in MAP in the 5% and 10% CO₂ treatment groups on the eighth day of storage. Therefore, the results demonstrate that “Kumsil” and “Kingsberry” could be marketable for six and four days, respectively, based on fruit marketability. - COLLAPSE

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March 2021