THE PROXIMATE AND PERFORMANCE EVALUATION OF SACCHAROMYCES CEREVISIAE FROM ON PALM WINE AND PROOFING DURING BREAD

THE PROXIMATE AND PERFORMANCE EVALUATION OF SACCHAROMYCES CEREVISIAE FROM ON PALM WINE AND PROOFING DURING BREAD

ABSTRACT

Saccharomyces cerevisiae was isolated from the fermenting sap of flaeis guinneensis. The yeast isolate was used in dough proofing at different temperatures. The samples B, C, D, E, and F, (containing the same ingredients) were leavened at 200 c, 250 c, 300  c and 40 c respectively. Similarly, sample A which served as the contol was leavened at 30c. the following proof heights were recorded 3.3cm, 1.9 cm, 23cm, 3.5cm, 3.6cm and 2.5cm respectively for the proofing period, samples D and E compared favourably with the control which has a proof height of 3.3cm. The bread height, weight , volume and the specific volume was recorded sensory evaluation was carried on the samples for taste, appearance, texture flavour and overall acceptability. Turkeys test was in the samples. Result of the sensory evaluation showed that samples D ranked favourably with the control in all quality attributes tested at (D < 0.05). The other samples were different from the control in all the sensory attributed tested for A proofing temperature of 300c using the isolate was recommended for bread making in other to achieve the desired bread quality.

CHAPTER ONE

INTRODUCTION

1.1       PALM WINE

Palm wine is a milky alcoholic beverage produced from the inflorescence of palm tree it is the most widely used and cherished natural traditional alcoholic beverage especial in the southern part of Nigeria, and is the juice of the oil paolm ( Elacis guinneensis) and raffia palm ( Rapia hooker) ( Ihekoronye and Ngoddy 1985).

A milky juice containing initially well over 13% sucrose is collected in the calabash which is hung at the base of the incision of the inflorescence of palm tree soon after leaving the tree, yeast spares, especially those of Saccharomyces cerevisias  infect the  juice and soon start to ferment the fermentable sugar.

Palm wine can be consumed as an alcoholic beverage. It could be allowed to ferment and subsequently distilled into gin it could also be used for the leavening of dough for bread making ( Somiari and Udoh 1993).

The use of palm wine and as a leavening agent for dough is attributed to the presence of a yeast strain contained in the palm sap. This yeast strain is saccharomyces cerevisiaem or baking yeast is called in the bakery industry.

Palm wine when fresh, tastes like ginger bear and can be used as like yeast ( Irvine 1961). Initially, the sap is sweet, dirty brown in colour. The fermentation process results in the sap becoming milky white in appearance. This is due to the presence of large number of fermenting bacteria and yeast.

Fermentation occurs between 36 – 38 hr period during which PH of sap falls from 7.0 –7.2 to < 4. (Jay 1986).

1.2       COMPOSITION OF PALM WINE

Palm wine has the average alcoholic content of 2.00 percent to 4. 69 percent. The sugary syrup, which is dirty brown in colour contains about 10 – 12 % sugar mainly sucrose.

Studies made by faparusi et al1986 found the following genera of bacteria to be the most predominant in finished produced Lactobacillus, Micrococcus, Leuconostoc, Streptococcus and Acetobacter. The predominate yeast found are Saccharomyces  and Candida spp with the former being the more common.

THE PROXIMATE AND PERFORMANCE EVALUATION OF SACCHAROMYCES CEREVISIAE FROM ON PALM WINE AND PROOFING DURING BREAD