Purification and biochemical characterization of phytase from Bacillus cereus isolated from gastrointestinal tract of African giant snail (Achatina fulica)

Sanni, David Morakinyo; Jimoh, Monsurat Bukola; Lawal, Olusola Tosin; Bamidele, Samuel Olufemi

doi:10.1007/s10123-023-00350-4

Cited by 3 publications

(1 citation statement)

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“…H. diversicolor, as salmon and most marine organisms, can be assumed to have a low digestive capacity of phytate contained in aquaculture sludge. However, the digestive system of polychaetes often harbors a range of bacteria such as Bacillus cereus, Bacillus subtilis, and Bacillus pumilus (Priscilla et al, 2022) which can produce phytase that breaks down phytate and releases phosphorus which could then be potentially absorbed by the specimens (Powar and Jagannathan, 1982;Hill et al, 2007;Sanni et al, 2023). Phytate digestion by H. diversicolor is however not well-studied, and further research is needed to explore the role of microorganisms in phytate digestion and the overall nutrient utilization in these organisms.…”

Section: Carbon (Mg Gmentioning

confidence: 99%

Upcycling of carbon, nitrogen, and phosphorus from aquaculture sludge using the polychaete Hediste diversicolor (OF Müller, 1776) (Annelida: Nereididae)

Anglade,

Kristensen,

Dahl

et al. 2023

Front. Sustain. Food Syst.

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IntroductionFocusing on circular bioeconomy and finding solutions for managing finite and scarce resources such as phosphorus are issues that need to be addressed across sectors to attain food security. Land-based aquaculture of Atlantic salmon (Salmo salar L.) smolt and post-smolt results in a large output of aquaculture sludge. These nutrient-rich side streams from aquaculture production constitute a valuable resource for cultivation of polychaetes Hediste diversicolor. The aim of this study was to evaluate the capacity of H. diversicolor to upcycle carbon (C), nitrogen (N), and phosphorus (P) contained in aquaculture sludge from Norwegian salmon production.Material and methodsWe investigated the effect of two diets, smolt sludge and post-smolt sludge, which were supplied at four different feed levels, on the gain of C, N, and P in H. diversicolor and established uptake rates for the upcycling of these nutrients. Additionally, we examined how different feed composition (type of diet) and supply (feel level) influenced C, N, and P content as well as the elemental ratios of H. diversicolor.Results and discussionPolychaetes fed with both types of sludge were shown to incorporate C, N, and P from their diets into biomass. Incorporation of C, N, and P in polychaete biomass was highest at the highest feed levels, following specific growth rates. Uptake of diet C, N, and P into polychaete biomass was similar for both diets and across feed levels. On average, C and N uptake rates amounted to 2–10% and 2–15%, respectively, while values for P uptake were lower at 0.5–1.5%. C, N, and P content of polychaetes was not affected by different diets or feed levels while the C:N ratio increased with increasing feed supply. Overall, we found that H. diversicolor can successfully take up nutrients contained in aquaculture sludge and thus can be beneficial for upcycling of side streams from Atlantic salmon production.

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