Central Journal of Human Nutrition & Food Science

Cite this article: Kavitha S, Parimalavalli R (2014) Effect of Processing Methods on Proximate Composition of Cereal and Legume flours. J Hum Nutr Food Sci 2(4): 1051.

*Corresponding authorS. Kavitha, Ph.D Scholar, Department of Food Science and Nutrition, Periyar University, Salem, Tamil Nadu, India; Email ID:

Submitted: 20 October 2014

Accepted: 04 December 2014

Published: 06 December 2014

ISSN: 2333-6706

Copyright© 2014 Kavitha et al.

OPEN ACCESS

Research Article

Effect of Processing Methods on Proximate Composition of Cereal and Legume floursS. Kavitha* and R. Parimalavalli Department of Food Science and Nutrition, Periyar University, Salem, Tamil Nadu, India

INTRODUCTIONGermination and roasting are the simple and easily adaptable

technologies for reduction of bulkiness and increasing shelf life of cereal and legume based food formulations [1]. Germination has been reported to induce an increase in free limiting amino acids and available vitamins with modified functional properties of seed components [2]. It has also been shown to decrease anti nutritional factors and also increase the protein digestibility, crude fibre and protein contents [3].

Roasting improves colour, extends shelf life, enhances flavor and reduces the anti-nutrient factors of cereals and legumes. More over roasting of grains lead to denaturation of proteins, thus improving their digestibility [4]. Most of the inhabitants use wheat as an ample food due to the scrupulous properties of proteins in flour [5]. Maize was traditionally grown as staple food, primarily for household consumption, but its demand for feed and industrial uses has increased rapidly in the recent past [6]. Mungbean is an excellent source of high quality plant

protein [7]. Groundnut is widely consumed in various parts of the world. Groundnut is a legume with seed rich in oil (48-49%) and protein (about 26%) [8]. Proximate composition is important in determining the quality of raw material and often the basis for establishing the nutritional value and overall acceptance of the consumers [9]. Physicochemical properties should be evaluated since they play an important role in the physical behavior of food or ingredients during processing and storage [10]. The objective of this study was to determine the effect of roasting and germination on the proximate composition of wheat, maize, mungbean and groundnut.

MATERIALS AND METHODSRaw materials such as wheat, maize, mungbean and

groundnut were obtained from local market, Salem, Tamil Nadu. The materials were cleaned to remove dirt and stones, washed, shade dried and divided into three batches. The first batch of material was raw and considered as control. The second and third batch samples were roasted and germinated respectively.

Abstract

Purpose - This paper aimed to demonstrate the proximate composition of cereal (wheat and maize) and legume (mungbean and groundnut) flours when subjected to two traditional processing methods (i.e. roasting and germination). Cereals are staple foods for human nutrition and most of the inhabitants use wheat as an ample food due to the dietary proteins in flour. Maize is an important cereal grain in the world and it has a diverse form of utilization including human food uses, animal feed formulation and as a basic raw material for industrial purposes. Legumes contain high amounts of protein; mungbean is an excellent source of high quality plant protein. Groundnut is a legume with seed rich in oil and protein.

Design - Raw ingredients were obtained, cleaned and divided into three batches. The first batch of material was raw and considered as control. The second and third batch samples were roasted and germinated respectively. Roasting and germination were done by the standard methods. Proximate composition such as moisture, ash, protein, fat, fiber, carbohydrate and energy were determined using the standard procedures.

Results - Processing methods such as roasting and germination greatly influenced the nutritional composition of cereal and legume flours. Roasting decreased all nutrients in flours. Germination increased moisture and protein content in all flours.

Conclusion - This study concluded that the cereal and legume flours have great nutritional values that could be harnessed by roasting and germination to meet nutritional needs and may be used in formulation of various foods.

Keywords•Proximate composition•Germination•Roasting•Cereals•Legumes

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Roasting and germination were done by the standard methods: wheat [11,12], maize [13,14], mungbean [15,16] and groundnut [17,18].

DETERMINATION OF PROXIMATE COMPOSITION OF RAW AND PROCESSED FLOURS

The samples of the three extruded weaning foods were separately analyzed for proximate composition using the official standard methods. Moisture content of the extrudates was determined by Association of Official Analytical Chemists method [19]. The gross energy values were estimated by multiplying the crude protein, fat and carbohydrate by their at water values of 4, 9 and 4 kcal/g respectively. Protein content was estimated from the crude nitrogen content of the sample determined by the MicroKjeldhal method (N × 6.25) [19]. Fat content of the samples was estimated by Soxhlet method given by [19]. Carbohydrate was calculated by difference method. Crude fiber and ash content of the samples was determined by the procedure given by Association of Official Analytical Chemists [19].

STATISTICAL ANALYSISTriplicate analyses were done for all nutritional properties.

Statistical analyses were performed with Statistical Package for Social Scientists (SPSS 14.0). A level of p < 0.05 was used to indicate significant differences among the samples.

RESULTS AND DISCUSSIONFood processing may affect the functionality and nutritional

quality of the food products. Effect of processing methods on nutritional composition of wheat flour is given in Table 1.

Major nutrients of wheat flour samples are presented in Table 1. Moisture content of GWF was the highest (13.56 ± 1.94 %) followed by CWF (12.20± 1.26%) and RWF (10.56 ± 0.64%). These values are within the range reported by other investigators [20,21,22]. However, investigations have shown that low moisture content of food samples is a desirable phenomenon, since the microbial activity is reduced [23]. Low moisture content in food samples increased the storage period of the food products [24]; while high moisture content in foods encourage microbial growth; hence, food spoilage occur [25].

Protein content of processed wheat samples varied between 10.02 ± 1.10% (CWF) and 14.10±1.83% (GWF). However, the protein content of both germinated and roasted wheat flour samples were significantly (p<0.05) higher than that of CWF sample. This observation is agreed with other scientific findings that processing techniques such as germination and

roasting improved the nutritional quality of the food products, particularly in terms of protein content [26,27]. Proteins in the raw samples were degraded and converted into a soluble state after germination. It was remarkable facts that free amino acids content decreased during steeping, mostly during the initial germination stage. The speed of utilizing the amino acid to synthesize the bio enzymes was faster than the proteins were being degraded into amino acids [28]. The significant increase in protein content seen in germinating flours is attributed to increased water activity as a result of induction of hydrolytic enzymes [29], hormonal changes [30] or a compositional change following the degradation of other constituents.

Carbohydrate and energy values of the wheat flour ranged between 80.32±7.26 - 87.60±6.83% and 386.46±15.68 - 397.68±10.24 Kcal, respectively. The carbohydrate content and energy values of germinated sample were lower than those of raw and roasted wheat flour samples; this observation could be due to the utilization of fat and carbohydrate for biochemical activities of the germinating seeds [31]. This result is similar with [32] who stated that carbohydrate and energy values of the raw and germinated wheat flour samples ranged 82.13 ± 0.49 - 84.63±0.43 g/100g and 396.17 ± 1.05 to 398.83 ± 2.41 Kcal, respectively.

Ash content of CWF was significantly (p<0.05) higher than RWF and GWF. This result is supported by [28] who indicated that ash content of raw wheat was 1.43 ± 0.02% and germinated wheat was 0.85 ± 0.04%. Fat content of CWF was significantly (p<0.05) higher than RWF and GWF. The decline is likely to be due to the use of the lipid as energy source during germination [33]. This result is supported by [28] who indicated that fat content of raw wheat was 1.47 ± 0.51% and germinated wheat was 0.60 ± 0.01%. Similarly fibre content of GWF was significantly (p<0.05) higher than CWF and RWF. This result is supported by [34] who indicated that fiber content of raw wheat was 1.70 ± 0.34% and germinated wheat was 1.93 ± 0.18%.

Proximate analyses (percentage moisture, ash, protein, fat, carbohydrate, fiber and carbohydrate) were carried out on maize flours and the result is shown in Table 2. Moisture content of maize flours were ranged from 7.06 ± 0.94 to 8.02 ± 1.26 %. Ash content of CMF was higher than RMF and GMF. This result is on par with [35] who reported that the ash content of raw and roasted maize flours was 1.23% and 1.51% respectively. The reduction in ash content might be due to the leaching out of both macro and micro elements into the soaking and cooking water [36].

Protein content of GMF was significantly (p<0.05) higher than CMF and RMF. This result is similar with [37] who stated that there was increment in protein content of sprouted maize flour than raw maize flour. The nutritional value of native proteins is improved by heat treatments as they are converted to more digestive denatured forms as well as result into inactivation of heat labile enzymes such as lipoxygenase, trypsin inhibitor and urease [38,39]. Fat content of RMF was significantly (p<0.05) higher than CMF and GMF. This result is similar with [37] who stated that sprouted maize flour contains less fat than raw maize flour. CMF had higher percentage of fiber than the RMF and GMF. The percentage composition of fiber in the maize flours was ranged from 0.75 % to 1.54 %, with GMF had the least percentage composition. [35] depicted that the fiber content of raw and

Properties Control (CWF)Roasted (RWF)

Germinated (GWF)

Moisture (%)Ash (%)

Protein (%)Fat (%)

Fiber (%)Carbohydrate (%)

Energy (Kcal)

12.20± 1.26 a

1.01± 0.03 a

10.02 ± 1.10 a

1.92 ± 0.66 a

1.51 ± 0.56 a

87.60±6.83a

397.68±10.24 a

10.56 ± 0.64 b

0.89 ± 0.09 b

11.23 ± 1.94 b

1.72 ± 0.54 b

1.46 ± 0.08 b

84.06 ± 4.56 b

389.06 ± 9.94 b

13.56±1.94 c

0.97±0.09 c

14.10±1.83 c

1.43±0.26 c

1.62±0.08 c

80.32 ± 7.26 c

386.46 ± 15.60c

Table 1: Proximate Composition of wheat flours.

Mean values of triplicate determination. Mean values within same row followed by different superscripts are significantly different (p<0.05).

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roasted maize was 1.58% and 0.82%. Carbohydrate and energy values of the maize flour samples ranged between 78.02 ± 3.26 and 97.60±4.83 % and 348.02±10.11 - 384.20±14.83 Kcal, respectively. The carbohydrate content and energy values of germinated sample were lower than those of raw and roasted maize flour samples. Percentage composition of carbohydrate was also found to be higher in the raw maize than roasted maize. This result is agreed with [35,40].

The proximate composition of mungbean flour samples is presented in Table 3. Moisture content was significantly increased after germination in mungbean (p < 0.05). This finding is similar to [41] in germinated legumes. As germination proceeds, legumes took up water from the surrounding in order for the metabolic process to commence. Dry legumes absorb water rapidly, influenced by structure of the legume. The increase in water uptake with time is due to the increasing number of cells within the seed becoming hydrated [29].

Ash content was significantly decreased in RMBF than CMBF and GMBF which is parallel to observations of [41,42,43,44]. The decrease in ash content represents loss in minerals due to rootlet and washing in water to reduce the sour smell during the period of germination [45].

Protein content was significantly increased in GMBF (p < 0.05). This result is similar with other studies done by [41,46,47,48] found different results. They found that total protein increased after germination process. [30] assumed that the increased was due to synthesis of enzyme proteins or a compositional change following the degradation of other constituents.

Fat content was decreased in GMBF than CMBF and RMBF (p < 0.05). Similar results occurred in study by [3,20,44,49] where the fat content decrease with increase in the time of germination. This is because fat was used as the major source of carbon for seed growth [30,44] also suggested that fatty acids are oxidized to carbon dioxide and water to generate energy for germination.

Carbohydrate content was increased significantly (p < 0.05) in CMBF than GMBF and RMBF [50] explained that during germination, carbohydrate was used as source of energy for embryonic growth which could explain the changes of carbohydrate content after germination. Additionally, β-amylase activity that hydrolyzes the starch into simple carbohydrate was increased [51]. Starch in cotyledon was broken down into smaller molecules such as glucose and fructose to provide energy for cell division while the seeds mature and grow [29,43,50] explained that carbohydrate breakdown in which α-amylase activities were found to parallel with the pattern of starch breakdown.

Fiber content was significantly decreased in CMBF than GMBF and RMBF. Fiber was significantly decreased in germinated kidney and mung beans (p < 0.05) but significant increased was found in germinated soy bean and peanut (p < 0.05). [52] reported that the effect of germination on fiber was dependent on type of legumes. Study by [53] demonstrated that fiber was decreased in soaked wheat, barley, peanut and mung bean, but conversely increased in soaked rice and soy bean. This indicates that germination process affect the level of fiber during the period of soaking before the actual phase of germination.

As shown in Table 4, moisture content was significantly increased after germination (p < 0.05). This finding is similar to the results reported by [41] in germinated groundnut. As germination proceeds, legumes took up water from the surrounding in order for the metabolic process to commence. Dry legumes absorb water rapidly, influenced by the structure of the legume. The increase in water uptake with time is due to the increasing number of cells within the seed becoming hydrated [29].

Ash content was significantly decreased in GGF sample (p < 0.05), parallel to observations of Ahmad and [31,41,44] reported that the differences in ash content after soaking for a specific time was due to decreased ash content. There was a significant effect of roasting and germination on ash content of groundnut compared to CGF. These findings are in agreement with those of [54] who reported that no significant effect of roasting on groundnuts. Germination significantly reduced the ash and fiber in groundnut. Fat content of GGF was deceased when compared to CGF and RGF. It has been suggested that the decrease in lipid content during germination was due to conversion of fatty acids into carbohydrates through the glyoxylate cycle [3].

Energy value of CGF was significantly (p<0.05) higher than RGF and GGF. Germination which is the process of soaking and

Properties Control (CMF) Roasted (RMF)Germinated

(GMF)Moisture (%)

Ash (%)Protein (%)

Fat (%)Fibre (%)

Carbohydrate (%)Energy (Kcal)

7.60±0.83 a

1.34 ± 0.16 a

5.64 ± 0.15 a

4.36 ± 0.36 a

1.54± 0.26 a

97.60±4.83 a

384.20±14.83 a

7.06 ± 0.94 b

1.19± 0.54 b

4.24 ± 0.17 b

5.09 ± 0.37 b

0.84± 0.04 b

87.06 ± 5.94 b

357.06 ± 11.10 b

8.02 ± 1.26 c

1.24±0.23 c

7.30±1.54 c

4.28±0.67 c

0.75±0.08 c

78.02 ± 3.26c

348.02 ± 10.11c

Table 2: Proximate Composition of maize flours.

Mean values of triplicate determination. Mean values within same row followed by different superscripts are significantly different (p<0.05).

PropertiesControl (CMBF)

Roasted (RMBF)

Germinated (GMBF)

Moisture (%)Ash (%)

Protein (%)Fat (%)

Fibre (%)Carbohydrate (%)

Energy (Kcal)

7.60±0.83 a

3.42 ± 0.09 a

21.9± 1.60 a

1.40 ± 0.15 a

3.80± 0.09 a

65.12 ± 3.26 a

342.12 ± 7.26 a

3.42 ± 0.45 b

3.06± 0.04 b

24.46 ± 1.94 b

1.36 ± 0.24 b

3.10 ± 0.12 b

64.4± 2.10 b

348.20 ± 0.94 b

9.65 ± 0.12 c

3.10±0.53 c

31.83±2.83 c

1.20±0.21 c

3.40±0.08 c

61.24±1.32 c

369.20±5.29c

Table 3: Proximate Composition of mungbean flours.

Mean values of triplicate determination. Mean values within same row followed by different superscripts are significantly different (p<0.05).

Properties Control (CGF) Roasted (RGF)Germinated

(GGF)Moisture (%)

Ash (%)Protein (%)

Fat (%)Fibre (%)

Carbohydrate (%)Energy (Kcal)

1.57±0.42 a

2.51 ± 0.13 a

29.12 ± 1.26 a

42.60± 1.81 a

2.70 ± 0.42 a

79.01± 5.21 a

582.13 ± 12.3 a

1.37 ± 0.24 b

2.35 ± 0.26 b

30.12 ± 1.94 b

43.21± 1.94 b

2.02 ± 0.34 b

74.06 ± 6.94 b

567.06 ± 9.94 b

2.89±0.41 c

2.22±0.10 c

31.60±2.83 c

40.60±1.62 c

2.10±0.65 c

76.21±4.83 c

574.16±10.83 c

Table 4: Proximate Composition of groundnut flours.

Mean values of triplicate determination. Mean values within same row followed by different superscripts are significantly different (p<0.05).

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steeping dry seeds in water, involves chemical changes due to the hydrolysis by the amylolytic enzymes α- and β- amylases, of complex macromolecules such as starch and proteins into low-molecular-weight and more digestible, molecules [49]. In addition, degradation and oxidation of starch observed during respiration provide energy for the increased metabolic functions in the germinated seeds. That may explain the decrease in energy value observed in groundnut after germination and roasting, compared to the raw groundnut (617±2 Kcal/100g) [55].

Protein content of CGF was significantly (p<0.05) lower than the processed flours. Protein levels were significantly greater in processed groundnuts compared to CGF, due to germination. [56] observed that significant increases in protein levels in groundnut after germination. [39] also reported an increase in protein content in groundnut compared to raw seeds. [30] assumed that the increased was due to synthesis of enzyme proteins or a compositional change following the degradation of other constituents. A further explanation was done by [29] where they noted that protein synthesis occurred during imbibition and that hormonal changes play an important role in achieving the completion of germination [57].

CONCLUSIONThe study concluded that processing methods such as

roasting and germination affect the nutritional composition of cereal and legume flours. Germination increased moisture and protein content in cereal and pulse flours. Roasting and germination significantly affect ash, fat, fiber, carbohydrate and energy content. From this study, it is believed that the cereal and legume flours have great nutritional values, which could be harnessed by processing methods to meet nutritional needs and used in formulation of various foods.

ACKNOWLEDGEMENTFinancial support from the University Grants Commission

(UGC), New Delhi for conducting this research work is gratefully acknowledged.

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