ABSTRACT
The proximate and sensory analysis of the cocoyam
supplemented wheat flour rock cake has been made. This was done to investigate
the nutritional value and the general acceptability of the cocoyam flour
supplemented rock cake. The proximate analysis indicates that the moisture
content, ash and the carbohydrate increase with increasing cocoyam flour
concentration.
Generally the ash content of composite rock cakes
increases as the level of supplementation increases implying that the inorganic
nutrients in the composite rock cake is richer than that of wheat rock cake. It
is observed from the organoleptic analysis that generally, whole wheat rock
cake cocoyam supplemented rock cake with cocoyam flour up to 30% is preferred
to rock cake with cocoyam flour beyond 30%. Thus cocoyam flour can be used to
substitute for wheat flour up to about 30%.
CHAPTER ONE
1.0.INTRODUCTION:
Over the years, the demand for pastry products in
Nigeria has been on the increase. Pastries such as rock cake and chin chins,
cake and chin chins and turnovers are sold at every corner of the streets of
the urban centres of Nigeria as snacks. In as much as the demand for pastry
products increase, the cost of the products also becomes very expensive
(Dotsey, 2009). This high cost is due to the fact that, urbanization in Nigeria
has increased the consumption of processed food and bakery products as well as
increased the demand for imported products. To reduce imports and to save
foreign exchange, it has been proposed that wheat be substituted with
alternative local products such as cassava, cocoyam, rice, sweet potato and
maize flours in the production of cake and chin chins. Two types of crops are
known by the name cocoyam, and are both herbaceous plants. The most common one
found on the Nigerian market is formally known as new cocoyam (Xanthosoma
sagittifolium) and its leaves are used as vegetables (kontomire). The second
type is known as old cocoyam (Colocasia esculenta) or taro; it grows in marshy
areas and unlike the new cocoyam, its leaves are not eaten (Dotsey, 2009).
Cocoyam (Xanthosoma sagittifolium) contribute significant portion of the
carbohydrate content of the diet in many regions in developing countries and
provide edible starchy storage corms or cormels. Although they are less
important than other tropical roots such as yam, cassava and sweet potato, they
are still a major staple in some parts of the tropics and sub-tropics (Opara,
2002; Ojinaka et al., 2009). The high content of calcium oxalate crystals 780 mg
per 100 g in some species of cocoyam, has been implicated in the acridity or
irritation caused by cocoyam. Oxalates tend to precipitate calcium and make it
unavailable for use by the body. The acridity of high oxalate cultivars of
cocoyam can be reduced by peeling, grating, soaking and fermenting during
processing (Food-info.net, 2010). Cocoyam is used essentially the same way as
yam, although it is not considered as prestigious as yam. Its flour has the
added advantage that, it is highly digestible and so is used for invalids and
as an ingredient in baby foods. Cassava (Manihot esculenta) is one of the most
important crops in Nigeria. In Africa, most cassava that is produced is used
for human food though in recent times, the industrial utilization is on the
ascendency. It is estimated that cassava provided about 40% of the calories
consumed in Africa (UNICEF, 1991). In Nigeria, the crop has several uses such
as in: Ampesi = Boiled cassava tubers normally eaten with stew Akple = Prepared
from a mixture of cassava and corn dough Fufu = Boiled and pounded cassava
eaten with soup Yakayake = Steamed cassava dough Kokonte = Dried unfermented
cassava chips, milled into flour and made into a thick paste and accompanied
with soup, just to mention a few (Dotsey, 2009).
Recently, varied percentages of wheat flour to Cocoyam
flour have been used to produce rock cake and chin chin and pastry products
successfully (UNICEF, 1991). The use of locally produced Cocoyam flour to
replace wheat flour as a source of carbohydrate, would reduce the cost of
production and save on foreign exchange. Cocoyam does not contain any gluten
and so if used to replace wheat flour 100%, the quality of the product will be
different. A suitable ratio for replacing wheat flour that will appeal to
consumers will depend on the kind of food. However, the properties of Cocoyam
flour are similar to those of wheat flour and therefore can partially
substitute for wheat flour in many wheat-based products. According to Kent and
Evers (1994) flours milled from other crops such as maize, millet, sorghum,
Cassava, potatoes and rice has been added to wheat flour to extend the use of
the local crops to reduce the cost of wheat importation. This is practiced
mostly in tropical countries where the soil and climate are not favourable for
commercial large scale production of wheat. Satisfactory rock cake and chin
chin has been made from such composite flour through a blend of wheat flour
with other cereals and root crops. In this work, composite rock cake and chin chin
made from Cocoyam flour is studied for its nutritional qualities. The analysis
of its acceptance by consumers is also made.
1.1.BACKGROUND OF THE STUDY:
The project work is channelled towards the production
of cocoyam snacks for use as breakfast in hotels and catering industry.
Cocoyam is a common name for several tropical root
vegetables and may refer to:
•Taro (Colocasia esculenta) – old cocoyam
•Malanga (Xanthosoma spp.) – new cocoyam
Taro It is a food staple in African, Oceanic and South
Indian cultures and is believed to have been one of the earliest cultivated
plants. Colocasia is thought to have originated in the Indomalaya ecozone,
perhaps in East India and Bangladesh, and spread by cultivation eastward into
Southeast Asia, East Asia and the Pacific Islands; westward to Egypt and the
eastern Mediterranean Basin and then southward and westward from there into
East Africa and West Africa, whence to the Caribbean and Americas. It is known
by many local names and often referred to as "elephant ears" when
grown as an ornamental plant.
Taro can be grown in paddy fields where water is
abundant or in upland situations where water is supplied by rainfall or
supplemental irrigation. Taro is one of the few crops (along with rice and
lotus) that can be grown under flooded conditions. This is due to air spaces in
the petiole, which permit underwater gaseous exchange with the atmosphere. For
a maximum dissolved oxygen supply, the water should be cool and flowing. Warm,
stagnant water causes basal rotting. For maximum yields, the water level should
be controlled so that the base of the plant is always under water.
Flooded cultivation has some advantages over dry-land
cultivation: higher yields (about double), out-of-season production (which may
result in higher prices), and weed control (which flooding facilitates). On the
other hand, in flooded production systems taro requires a longer maturation
period, investment in infrastructure, and higher operational costs, and
monoculture is likely.
Like most root crops, taro and eddoes do well in deep,
moist or even swampy soils where the annual rainfall exceeds 2,500 mm. Eddoes
are more resistant to drought and cold. The crop attains maturity within six to
twelve months after planting in dry-land cultivation and after twelve to
fifteen months in wetland cultivation. The crop is harvested when the plant
height decreases and the leaves turn yellow. These signals are usually less
distinct in flooded taro cultivation.
Harvesting is usually done by hand tools, even in
mechanized production systems. First, the soil around the corm is loosened, and
then, the corm is pulled up by grabbing the base of the petioles. The global
average yield is 6.2tones/hectare but varies according to the region.
Xanthosoma is a genus of flowering plants in the arum
family, Araceae. The genus is native to tropical America but widely cultivated
and naturalized in other tropical regions. Several are grown for their starchy
corms, an important food staple of tropical regions, known variously as
malanga, otoy, otoe, cocoyam (or new cocoyam), tannia , tannier, yautía ,
macabo, ocumo, macal, taioba , dasheen , quequisque , ʻape and (in
Papua New Guinea) as Singapore taro ( taro kongkong ). Many other species
(including especially X. roseum) are used as ornamental plants, and in popular horticultural
literature are known as ‘ape or elephant ear (from the purported resemblance of
the leaf to an elephant's ear), although the latter name is sometimes also
applied to members with similar appearance and uses in the closely related
genera Caladium, Colocasia (i.e., taro), and Alocasia. The leaves of most
Xanthosoma species are 40-200 cm long, sagittate (arrowhead-shaped) or
subdivided into three or as many as 18 segments. Unlike the leaves of Colocasia,
those of Xanthosoma are usually not peltate- the upper v-notch extends into the
point of attachment of the leaf petiole to the blade.
1.2.STATEMENT OF PROBLEM:
The following forms the statement of problem that
necessitated research of this project work.
a.The high cost of wheat flour baked cake and chin
chin.
b.Rate of importing baked cake and chin chin.
c.Ignorance of the public about the different uses of
cocoyam and its inherent nutritional contents.
d.The constant use of wheat meal flour baked cake and
chin chin as breakfast in hotels and catering industry which most times are not
that easy to digest.
1.3.OBJECTIVE OF THE STUDY:
At the end of this research and its subsequent
outreach to the general public, it is expected to achieve the following
objectives:
a.It will bring about a great reduction to the rate of
importing flours for baking.
b.It will enlighten the general public on the
different uses/application of cocoyam and its inherent nutritional contents.
c.It will compete favourably with the imported baked
cake and chin chins in the market where it expected to have an edge over the
later because of its fast digestion process and low starch content.
d.Also, it is expected that the rate of using wheat
flour cake and chin chin for breakfast in hotels and catering industry will be
curtailed as soon as this research work is introduced to the public.
e.It is also expected to provide alternative option to
those that don’t like the wheat flour baked cake and chin chins.
1.4.SIGNIFICANCE OF THE STUDY:
The significance of this project work is the
advantages associated with the use of cocoyam flour in baking most of the cake
and chin chins used in the hotel and catering industry due its higher
nutritional contents as compared to the wheat flour as well as its digestion
rate.
It have been discovered that the starch content of the
cocoyam flour is lower as compared to the wheat flour. This therefore means
that those with excess sugar related issues can take them comfortable with
having any problem. Also, breakfast which is known for its speedy digestion
accompanied by a tremendous release of energy will be boosted by the cocoyam
flour since it have been discovered that the wheat flour have a slow digestion
process as compared to the cocoyam flour.
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