Impact of postharvest processing on the fungal population contaminating African walnut shells (Tetracarpidium conophorum Mull. Arg) at different maturity stages and potential mycotoxigenic implications

Nkwonta, Chikere G.; Medina, Ángel; Alamar, M. Carmen; Terry, Leon A.

doi:10.1016/j.ijfoodmicro.2014.10.024

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…during storage. Nkwonta et al [ 27 ] found that Aspergillus , Fusarium , and Penicillium spp. were the main potentially mycotoxigenic fungal groups frequently isolated from African walnuts.…”

Section: Discussionmentioning

confidence: 99%

Exploring the Efficacy of Biocontrol Microbes against the Fungal Pathogen Botryosphaeria dothidea JNHT01 Isolated from Fresh Walnut Fruit

Zhang

Shi

Shen

et al. 2022

Foods

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Biological control by antagonistic microorganisms are an effective and environmentally friendly approach in postharvest disease management. In order to develop a biocontrol agent for fresh walnut fruit preservation, the potential biocontrol effects of Bacillus amyloliquefaciens RD.006 and Hanseniaspora uvarum FA.006 against the main fungal pathogen of walnuts were evaluated. Botryosphaeria species showed the highest detection, and the JNHT01 strain showed the strongest pathogenicity. Bot. dothidea JNHT01 caused gray mold and brown rot on fresh walnuts, and its incidence rate reached 100% after an 8 days incubation. The growth of this fungal strain can be promoted by lighting, with a maximum growth rate achieved at a pH of 7 and at 28 °C. B. amyloliquefaciens RD.006 and H. uvarum FA.006 supernatants at a concentration of 1–15% v/v showed antifungal activity. The mycelial growth inhibition rates of Bot. dothidea JNHT01 were 23.67–82.61% for B. amyloliquefaciens RD.006 and 1.45–21.74% for H. uvarum FA.006. During Bot. dothidea JNHT01 growth, the biomass, nucleic acid leakage, and malondialdehyde content gradually increased, while the DPPH scavenging capacity and SOD activity decreased. The B. amyloliquefaciens RD.006 and H. uvarum FA.006 strains showed antifungal activity by damaging fungal cell membranes and reducing fungal antioxidant activity. Moreover, the antifungal effect of B. amyloliquefaciens RD.006 was higher than that of H. uvarum FA.006. Hence, the RD.006 strain of B. amyloliquefaciens can be considered a potential biocontrol agent for the management of postharvest walnut diseases caused by Bot. dothidea.

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Section: Discussionmentioning

confidence: 99%

Exploring the Efficacy of Biocontrol Microbes against the Fungal Pathogen Botryosphaeria dothidea JNHT01 Isolated from Fresh Walnut Fruit

Zhang

Shi

Shen

et al. 2022

Foods

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“…It contains key vitamins (B1, B2, B3, B12, C, and E) with ascorbic acid-4.2 mg/100 g and tocopherol-0.123 mg/100 g being the most abundant (Ayoola et al, 2011). The oil content of raw, boiled, and processed samples (38%-49%) contain both linoleic and α-linolenic acids with the latter as the most abundant fatty acid in the oil (Nkwonta et al, 2015). Assessment of the protein content with respect to supporting growth and tissue maintenance highlights its potential use as alternative protein source in infant formulations.…”

Section: Nutritional Composition and Potential To Improve Nutrition A...mentioning

confidence: 99%

Underutilised food crops for improving food security and nutrition health in Nigeria and Uganda—a review

Nkwonta

Auma

Gong

2023

Front. Sustain. Food Syst.

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Food and nutrition insecurity are pressing global issues, pertinent to the United Nations’ Sustainable Development Goal 2 (zero hunger). About 1 in 10 people globally are food insecure, with both the COVID-19 pandemic and the Ukraine-Russia crisis exacerbating the problem, partly due to unprecedented shortages in major food commodities, such as wheat, rice, and sunflower oil. Food and nutrition security have been negatively impacted in sub-Saharan African countries like Nigeria and Uganda where, prior to both crises, 25% of the population were already food insecure and children under five and women of reproductive age faced severe undernutrition, micronutrient deficiencies, and their associated health challenges. The recent crises have highlighted the need for a paradigm shift from relying on a few crops to a diversified, sustainable food system that harnesses the potential of neglected and underutilized species (NUS) for food and nutrition insecurity solution, especially in low and middle-income countries. Despite their abundance (>100 edible species) and high nutritional value, various political, socio-cultural, and infrastructural factors have deterred commercialization and utilization of NUS in sub-Saharan Africa. Moreover, there are limited sophisticated studies on many of NUS local to the region. This review aimed to discuss selected NUS, peculiar to Nigeria, namely, African walnut (Tetracarpidium conophorium), African breadfruit (Treculia africana), and Uganda, namely, sesame (Sesamus indicum L.) and pigeon pea (Cajanus cajan L.), and their potential to sustainably contribute towards improved food and nutrition security. The crops are briefly described, and their indigenous uses, nutritional value and medicinal properties highlighted. Issues relating to their production, processing, consumption, and exportation are reviewed considering their contribution towards sustainable food systems.

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“…Moisture content and storage conditions are intrinsic and extrinsic factors influencing fungal growth and mycotoxin production. Fungal spoilage affects nuts' sensorial and nutritional properties (Nkwonta, Medina, del Carmen Alamar, & Terry, 2015), so it should be prevented. Influences of SA coating before and after CaCl 2 treatment were evaluated (Fig.…”

Section: Antifungal Activitymentioning

confidence: 99%

Effect of sodium alginate-calcium chloride coating and glycerol and sorbitol concentration on oxidative stability and fungal growth of Persian walnut (Juglans regia L.)

Sharafi-Badr¹,

Ehsandoost²,

Ghasemiyanpour³

et al. 2022

RMIQ

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Impact of postharvest processing on the fungal population contaminating African walnut shells (Tetracarpidium conophorum Mull. Arg) at different maturity stages and potential mycotoxigenic implications

Cited by 8 publications

References 25 publications

Exploring the Efficacy of Biocontrol Microbes against the Fungal Pathogen Botryosphaeria dothidea JNHT01 Isolated from Fresh Walnut Fruit

Exploring the Efficacy of Biocontrol Microbes against the Fungal Pathogen Botryosphaeria dothidea JNHT01 Isolated from Fresh Walnut Fruit

Underutilised food crops for improving food security and nutrition health in Nigeria and Uganda—a review

Effect of sodium alginate-calcium chloride coating and glycerol and sorbitol concentration on oxidative stability and fungal growth of Persian walnut (Juglans regia L.)

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