Shelf-life stability of Asparagopsis bromoform in oil and freeze-dried powder

Tan, Siong, Harris, Jessica, Roque, Breanna M., Askew, Shane, and Kinley, Robert D. (2023) Shelf-life stability of Asparagopsis bromoform in oil and freeze-dried powder. Journal of Applied Phycology, 35. pp. 291-299.

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Abstract

The idea of delivering bromoform from Asparagopsis using edible oil has gained momentum recently due to the improved processing time and that it is already a feed that many livestock producers use. The stability of bromoform in oil compared to freeze-dried product is still not well understood. To fill this gap, a systematic study was carried out to determine the effects of storage temperatures (40 °C, 25 °C, 4 °C and -20 °C), fluorescent light and exposure to open air, on the retention of bromoform in freeze-dried Asparagopsis (FD-Asp) and Asparagopsis oil (Asp-Oil) over 24-week period. In the absence of fluorescent light, Asp-Oil was a more effective way to preserve bromoform compared to FD-Asp due to either no change or higher Asp-Oil bromoform content (storage temperature dependent) after 24-week storage. Under the same conditions, FD-Asp bromoform content decreased by 74% at 40 °C, 53% at 25 °C, 6% at 4 °C, and no change of FD-Asp bromoform content at -20 °C. The presence of fluorescent light negatively affected Asp-Oil bromoform content at both 25 °C and 40 °C while the effect was insignificant on FD-Asp. The exposure of Asp-Oil to open air resulted in the decrease of bromoform content to below quantification limit (0.18 mg g(-1)) on week 8 for 40 °C sample and on week 16 for 25 °C sample. This study provides empirical evidence on the stabilising effect of oil in preserving bromoform extracted from Asparagopsis, confirming it is a more attractive medium to deliver bromoform compared to the freeze-dried powder form.

Item ID: 77071
Item Type: Article (Research - C1)
ISSN: 1573-5176
Keywords: Asparagopsis, Rhodophyta, Shelf-life, Bromoform, Edible oil, Freeze-dried
Copyright Information: © The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License
Date Deposited: 14 Dec 2022 09:18
FoR Codes: 31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310801 Phycology (incl. marine grasses) @ 60%
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3006 Food sciences > 300604 Food packaging, preservation and processing @ 20%
30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3003 Animal production > 300303 Animal nutrition @ 20%
SEO Codes: 10 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 1001 Environmentally sustainable animal production > 100199 Environmentally sustainable animal production not elsewhere classified @ 50%
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280102 Expanding knowledge in the biological sciences @ 50%
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