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Ha NI, Mun SK, Im SB, Jang HY, Jeong HG, Kang KY, Park KW, Seo KS, Ban SE, Kim KJ, Yee ST. Changes in Functionality of Tenebrio molitor Larvae Fermented by Cordyceps militaris Mycelia. Foods 2022; 11:foods11162477. [PMID: 36010477 PMCID: PMC9407045 DOI: 10.3390/foods11162477] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 08/10/2022] [Accepted: 08/15/2022] [Indexed: 11/18/2022] Open
Abstract
The Food and Agriculture Organization (FAO) has been estimating the potential of insects as human food since 2010, and for this reason, Tenebrio molitor larvae, also called mealworms, have been explored as an alternative protein source for various foods. In this study, in order to increase nutrient contents and improve preference as an alternative protein source, we fermented the T. molitor larvae by Cordyceps militaris mycelia. T. molitor larvae were prepared at optimal conditions for fermentation and fermented with C. militaris mycelia, and we analyzed T. molitor larvae change in functionality with proximate composition, β-glucan, cordycepin, adenosine, and free amino acids content. T. molitor larvae fermented by C. militaris mycelia showed higher total protein, total fiber, and β-glucan content than the unfermented larvae. In addition, the highest cordycepin content (13.75 mg/g) was observed in shaded dried T. molitor larvae fermented by C. militaris mycelia. Additionally, the isolated cordycepin from fermented T. molitor larvae showed similar cytotoxicity as standard cordycepin when treated with PC-9 cells. Therefore, we report that the optimized methods of T. molitor larvae fermented by C. militaris mycelia increase total protein, total fiber, β-glucan and produce the amount of cordycepin content, which can be contributed to healthy food and increase T. molitor larvae utilization.
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Affiliation(s)
- Neul-I Ha
- Department of Pharmacy, Sunchon National University, Jungang-Ro, Suncheon 549-742, Korea
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Seul-Ki Mun
- Department of Pharmacy, Sunchon National University, Jungang-Ro, Suncheon 549-742, Korea
| | - Seung-Bin Im
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Ho-Yeol Jang
- Suncheon Research Center for Bio Health Care, Jungang-Ro, Suncheon 57922, Korea
| | - Hee-Gyeong Jeong
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Kyung-Yun Kang
- Suncheon Research Center for Bio Health Care, Jungang-Ro, Suncheon 57922, Korea
| | - Kyung-Wuk Park
- Suncheon Research Center for Bio Health Care, Jungang-Ro, Suncheon 57922, Korea
| | - Kyoung-Sun Seo
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Seung-Eon Ban
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Kyung-Je Kim
- Jangheung Research Institute for Mushroom Industry, Jangheung 59338, Korea
| | - Sung-Tae Yee
- Department of Pharmacy, Sunchon National University, Jungang-Ro, Suncheon 549-742, Korea
- Correspondence: ; Tel.: +82-61-750-3752; Fax: +82-61-750-3708
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Graham DC, Steinkraus KH, Hackler LR. Factors affecting production of mold mycelium and protein in synthetic media. Appl Environ Microbiol 1976; 32:381-7. [PMID: 10836 PMCID: PMC170074 DOI: 10.1128/aem.32.3.381-387.1976] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The effects of certain cultural conditions on the yield of dry mycelium, protein, and total amino acid content of Rhizopus oligosporus Saito (NRRL 2710), Rhizopus rhizopodiformis (Cohn apud Lichtheim) Zopf (NRRL 6246), and Absidia corymbifera (Cohn) Sacc. et Trotter (NRRL 6247) were studied. The yield of mycelium was found to significantly increase as the spore inoculum was increased from 187,500 to 2,250,000 spores. But the total amino acids (grams/liter) did not change significantly, whereas the percentage of crude protein decreased. An inoculum containing approximately 750,000 spores/ml was used in all of the other experiments. Mycelial production was highest at 37 degrees C for all three molds. However, the best temperature for percentage of crude protein and total amino acids varied with the organism. The mycelial yield and total crude protein of R. oligosporus showed some significant changes as the C/N ratio was increased in 3% glucose medium. In a synthetic medium having a 15:1 C/N ratio, the strains of R. oligosporus, R. rhizopodiformis, and A. corymbifera had better yields from falactose than glucose, not only in dry mycelium but also in total crude protein (grams/liter) and total amino acids (grams/liter). R. oligosporus grew very well on several ammonium salts. but the maximum yield of dry mycelium, total crude protein (grams/liter), and total amino acids (grams/liter) occurred with ammonium sulfate. The optimum pH for both Rhizopus species was 4.0, although R. oligosporus grew equally well at pH 3.0 and slightly less at pH 5.0. The highest yield of mycelium for A. corymbifera was obtained in a medium with an initial pH of 8.0. It was calculated that a fermenter chanrged with an adequate medium and 1,000 lb (about 450 kg) of R. oligosporus or A. corymbifera cells could produce 88 or 90 lb of protein (on a dry-weight basis) per h if the product was removed continuously.
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