(PDF) Assessment of Nunu Produced Using Pure Starter Culture

Content Structure of Assessment of Nunu Produced Using Pure Starter Culture

The abstract contains the research problem, the objectives, methodology, results, and recommendations

Chapter one of this thesis or project materials contains the background to the study, the research problem, the research questions, research objectives, research hypotheses, significance of the study, the scope of the study, organization of the study, and the operational definition of terms.
Chapter two contains relevant literature on the issue under investigation. The chapter is divided into five parts which are the conceptual review, theoretical review, empirical review, conceptual framework, and gaps in research
Chapter three contains the research design, study area, population, sample size and sampling technique, validity, reliability, source of data, operationalization of variables, research models, and data analysis method
Chapter four contains the data analysis and the discussion of the findings
Chapter five contains the summary of findings, conclusions, recommendations, contributions to knowledge, and recommendations for further studies.
References: The references are in APA
Questionnaire.

Abstract Of Assessment of Nunu Produced Using Pure Starter Culture

Nunu is Nigerian locally fermented milk product commonly prepared by Hausa/Fulani cattle rearers. It’s mostly available in the Northern part of Nigeria. It’s production and consumption derives food security and economic benefits to the rural people in the region. However, the process characteristics results in products which are not appealing to many people. Lactic acid bacteria are mostly associated with the production of fermented milk products. They play key role in producing desirable flavour, aroma and good physical appearance in fermented milk products. Isolation and identification of LAB from nunu of spontaneous fermentation was carried out and labeled LAB 1-LAB 4. An assessement of the organoleptic property, pH, shelf-life and overall acceptability was determined. After 24 hours of fermentation, a general decrease in pH was observed. The pH ranged between 5.58 – 6.29. Nunu samples fermented with mixed starter culture, LAB 1+2, had the best sensory evaluation described as ; fermented, sour, characteristic of the nunu, pleasant, soft, smooth, semi- solid, viscous and with the highest overall acceptability of 7 on the hedonic scale. While nunu fermented with Lab3 and Lab 2+3 had a sensory evaluation of being umami, milk, rough, not pleasant aroma and gritty with an overall acceptability of 2 on the hedonic scale. The nunu sample produced stored in refrigerator had a shelf-life of 6 days while the sample stored at room temperature (28±2^oC ) had a shelf-life of 3 days.

Chapter One Of Assessment of Nunu Produced Using Pure Starter Culture

INTRODUCTION

Nunu is a spontaneously fermented milk (yoghurt-like) product in Nigeria and other parts of West Africa including Ghana and Burkina Faso. Unlike other African fermented milk products where milk of goats, sheep, and camels is used, Nunu is solely prepared from cow milk. The traditional processing of Nunu involves collecting fresh cow milk into containers and then allowing it to ferment for a day or two days at ambient temperature. Nunu is yoghurt-like in taste (a sharp acid taste) and it can be taken alone or with Fura (Owusu-Kwarteng et al., 2012; Akabanda et al., 2013). Like many other spontaneously fermented foods in Africa, the production of Nunu is largely home-based and the fermentation is spontaneous. Thus, starter cultures are not available, but old stocks of previous ferments and fermentation containers are used to initiate fermentation in new batches. The dependence on such undefined and diverse microbial consortium during Nunu fermentation may result in product of variable quality and stability.

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Currently, there is no information on the use of starter cultures for Nunu fermentation. However, few investigations have been carried out on the microbiology of Ghanaian traditionally fermented milk products (Obodai and Dodd,2006; Akabanda et al., 2010). The predominant microorganisms isolated from this traditionally fermented milk should be developed into starter cultures that could be used to produce fermented milk products of consistent quality and consumer acceptability. Thus, it should be possible to improve the quality and consumer acceptability of Nunu through controlled fermentation using starter culture.

The culture should, however, be well-defined. Such starter cultures must be developed with a clear understanding of the ecology of the microbial species associated with the desirable traditional fermentation process, and their contributions to the products safety and quality are determined. The first stage in designing such starter culture(s) is to characterize and identify the technologically important microorganisms associated with the traditional fermentation of the product and then to test the use of the identified organisms in fermentation trials.

The objective of the present study was therefore to evaluate the technological potential of lactic acid bacteria isolated from spontaneously fermented Nunu in view of their application as starter cultures in Nunu production.

AIM OF THE STUDY

The present study was undertaken with the aim to investigate and assess microorganism present in ‘Nunu’ produced using pure starter culture.

OBJECTIVES OF THE STUDY

To inoculate pure starter culture into freshly prepared ‘Nunu’.
To isolate and enumerate Lactic Acid Bacteria present in the produced ‘Nunu’.
To isolate, characterize and enumerate other microorganisms present in the produced ‘Nunu’.
To make useful recommendations based on my findings.

SIGNIFICANCE OF THE STUDY

The significance of the research is to assess Lactic acid Bacteria and other microorganisms in ‘Nunu’ (fresh fermented cow milk) produced using pure starter culture based on phenotypic characteristics (morphology and physiology).

More especially this study would serve as a guideline for further research and investigation of the role of fermented foods as physiological agents and at this point, hopefully expose the particular peptides and amino acids responsible for particular physiological roles.

SCOPE AND LIMITATION

The research work would assess, identify and enumerate LABs to their generic level as identification to specie level is strenuous and elaborate.

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