Solid-state fermentation production of L-lysine by Corynebacterium glutamicum (ATCC 13032) using agricultural by-products as substrate.

To meet the growing demand for L-lysine, an essential amino acid with various applications, it is crucial to produce it on a large scale locally instead of relying solely on imports. This study aimed to evaluate the potential of using Corynebacterium glutamicum ATCC 13032 for L-lysine production from agricultural by-products such as palm kernel cake, soybean cake, groundnut cake, and rice bran. Solid-state fermentation was conducted at room temperature for 72 h, with the addition of elephant grass extract as a supplement. The results revealed that these agricultural by-products contain residual amounts of L-lysine. By employing solid-state fermentation with C. glutamicum (106 CFU/ml) in 100 g of various agricultural by-products, L-lysine production was achieved. Interestingly, the addition of elephant grass extract (1 g of elephant grass: 10 ml of water) further enhanced L-lysine production. Among the tested substrates, 100 g of groundnut cake moistened with 500 ml of elephant grass extract yielded the highest L-lysine concentration of 3.27 ± 0.02 (mg/gds). Furthermore, fermentation led to a substantial rise (p < 0.05) in soluble protein, with solid-state fermented soybean cake moistened with 500 ml of elephant grass extract exhibiting the highest amount of 7.941 ± 0.05 mg/gds. The activities of xylanase, amylase and protease were also significantly enhanced. This study demonstrates a viable biotechnological approach for locally producing L-lysine from agricultural by-products using solid-state fermentation with C. glutamicum. The findings hold potential for both health and industrial applications, providing a sustainable and economically feasible method for L-lysine production.

Solid-state fermentation of cassava (Manihot esculenta Crantz): a review.

Solid-state fermentation (SSF) is a promising technology for producing value-added products from cassava (Manihot esculenta Crantz). In this process, microorganisms are grown on cassava biomass without the presence of free-flowing liquid. Compared to other processing methods, SSF has several advantages, such as lower costs, reduced water usage, and higher product yields. By enhancing the content of bioactive compounds like antioxidants and phenolic compounds, SSF can also improve the nutritional value of cassava-based products. Various products, including enzymes, organic acids, and biofuels, have been produced using SSF of cassava. Additionally, SSF can help minimize waste generated during cassava processing by utilizing cassava waste as a substrate, which can reduce environmental pollution. The process has also been explored for the production of feed and food products such as tempeh and cassava flour. However, optimizing the process conditions, selecting suitable microbial strains, and developing cost-effective production processes are essential for the successful commercialization of SSF of cassava.

Biochemical characterization of solid-state fermented cassava roots (Manihot esculenta Crantz) and its application in broiler feed formulation.

The biochemical parameters of solid-state fermented peeled and unpeeled cassava roots (Manihot esculenta Crantz) and their application in broiler feed formulations were investigated. Fermentation occurred at room temperature for 72 h (pH 3-9). The samples utilized for five (5) broiler starter feeds were labeled: control, unfermented unpeeled cassava (UUC), unfermented peeled cassava (UPC), fermented unpeeled cassava (FUC), and fermented peeled cassava (FPC). Formulations were made by substituting fermented/non-fermented cassava roots at pH 7 for maize (w/w%). Fermentation-induced changes included increased soluble and total protein concentrations (69.3 and 334.5 mg/g) and (9.6 and 10.8%), respectively, in cultures prepared with peeled and unpeeled cassava at pH 7 compared to the control (p < 0.05), and a reduction (p < 0.01) in cyanide concentration from 44.4 to 78.7 mg/kg in the control to 8.5 and 13.7 mg/kg in fermented cassava at pH 7. Birds fed FUC and FPC meal (0.6 and 0.5 kg) gained significantly more weight (p < 0.05) than those fed the control (0.3 kg). The biochemical parameters aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine, and urea levels in broiler serum did not differ significantly (p > 0.05) for birds fed with fermented peeled and unpeeled cassava. Conversely, serum albumin and calcium levels were significantly lower (p < 0.05) for birds fed with the control feed compared to birds fed with fermented feeds. The results imply that fermented peeled and unpeeled cassava roots could be a safe and nutritionally beneficial replacement for maize in broiler diet.

Concentrations and risks of polychlorinated biphenyls (PCBs) in transformer oils and the environment of a power plant in the Niger Delta, Nigeria.

The concentrations of Æ©14 PCBs were determined, with the aid of gas chromatography-mass spectrometry (GC-MS), in transformer/turbine oils, soils, groundwater, and drainage water collected within a power plant in the Niger Delta of Nigeria. The Æ©14 PCB concentrations in the transformer oils, drainage water, groundwater and soils ranged from 484 to 48506 mg kg-1, 0.99 to 2.95 mg L-1, 0.16 to 0.56 mg L-1 and from 8.4 to 510 mg kg-1 respectively. The congener distribution patterns in these samples indicate the dominance of highly chlorinated homologues (hepta- and octa-PCBs). The Σ14 PCB concentrations in the transformer oils were above the provisional definition of low persistent organic pollutant (POP) content for PCBs of 50 mg kg-1 as defined in the guidelines on the management of POP waste of the Basel Convention. The concentrations of Æ©14 PCBs in the soils were above the Dutch guideline value of 1000 µg kg-1 and the estimated incremental lifetime cancer risks relating to exposure of humans to PCBs in soils indicate serious health risks. There is therefore a need to implement a surveillance programme in the vicinity of power plants to determine the impacts on the adjacent ecosystem.

Prevalence of hyperglycemia and risk factors for orodental disease in Nigeria: Implications of opportunistic screening.

BACKGROUND: Diabetes mellitus (DM) is associated with complications and orodental disease. Whether screening for DM during orodental health visits is a potential option is yet to be established in Nigeria. This study aims at assessing the prevalence of hyperglycemia in orodental disease as a clinical scenario to capitalize for opportunistic screening. MATERIALS AND METHODS: This study was undertaken in Catholic Hospital Abbi for Ndokwa communities and dental clinic of Eku Baptist Government Hospital, all in Nigeria. However, 474 individuals (433 community-based and 41 dental clinic-based) including 10 orodental cases were screened for hyperglycemia and waist-hip circumference indices. Blood lipid profiles were also performed. Based on fasting blood glucose levels, participants were grouped into non-diabetic (n = 172), prediabetic (n = 168), and diabetic (n = 78). A World Health Organization questionnaire on oral health was used to collect information on orodental disease risk factors. Data were analyzed with IBM SPSS 22 statistical package. RESULTS: In the community-based cohort, the prevalence of hyperglycemia was 56.8%, including 38.8% prediabetes and 18.0% undiagnosed DM (UDM). In the dental-based group, 63.4% were hyperglycemic including 53.7% prediabetes and 9.7% UDM. There was significant difference (P < 0.05) in the ages of the participants in relation to glycemic status, with 17-29 years having the highest prevalence of UDM. However, 42.5% of the community-based clients had indication(s) of orodental disease. CONCLUSION: This is probably the first study to highlight higher prevalence of hyperglycemia from screening at a dental setting compared to general clinic. Opportunistic screening of DM in dental settings may be an option to consider during clients' orodental health visits.

Prediabetes and cardiovascular complications screening in Nigeria: A family case presentation.

Metabolic disorders are on the increase globally, and the need for screening remains imperative. This case report is of a 48-year-old man who was screened as dyslipidaemic and on metabolic syndrome prevention, precipitating screening of family relatives. The extended family members (N=11) were invited for screening, of which 4 were hyperglycaemic, 3 had hypercholesterolaemia; and the HDL levels of 6 participants were abnormal. All family members had normal plasma triglyceride levels, and 4 people had high blood pressure. There was an indication that 55% members of a family had up to two metabolic disorders or risk factors including dyslipidaemia that may predispose them to CVD; as well as family history of periodontitis in the family. This pilot study plans to follow-up its association with dyslipidaemia as well as with prediabetes. The feasibility of using simple and affordable screening test for diabetes in oral health clinics and vice versa, including review of observations of technical importance relevant to pathology logistics will be investigated.

Co-morbidity of Diabetes Mellitus and Orodental Diseases in Nigeria.

BACKGROUND: Although several epidemiological studies have reported an association between diabetes mellitus (DM) and orodental health. However, the occurrence of the co-morbidity of both diseases has been more of suspicion than evidence-based. DM is a serious public health concern globally, and in Nigeria. Studies have separately documented the prevalence of DM and orodental diseases, but data lack to adequately rationalise co-morbidity of both diseases. OBJECTIVE: The study aimed to report evidence of co-morbidity of DM and orodental diseases in Nigeria. METHOD: Data published between December, 1970 and June, 2015 were used in writing the review. These data were collated from electronic literature archives and databases. RESULT: This review suggests evidence of the association of DM and orodental diseases. It revealed that both diseases are densely distributed in South-East, South-South and South-West geopolitical zones of Nigeria, and sparsely spread across other regions of the country. CONCLUSION: Co-morbidity of both diseases holds promise that will favour public health practice, especially in Nigeria. It is hoped that the association may lead to the establishment of a cost-effective DM screening protocol in Nigeria. Again, screening of DM in dentistries and vice versa may be possible through the relationship of both diseases. It is recommended that the driving force of the co-morbidity be investigated.