Chemical and Pasting Properties of Potato Flour (Solanum tuberosum L.) in relation to Different Processing Techniques

Author:

Buzera Ariel12ORCID,Nkirote Evelyne2,Abass Adebayo3,Orina Irene2ORCID,Sila Daniel2

Affiliation:

1. Faculty of Agriculture and Environmental Science, Université Evangélique en Afrique (UEA), P.O. Box 3323 Bukavu, Sud-Kivu/RD, Congo

2. Department of Food Science & Technology, Jomo Kenyatta University of Agriculture and Technology (JKUAT), P.O. Box 62000-00200 Nairobi, Kenya

3. International Institute of Tropical Agriculture (IITA), No. 25; Light Industrial Area, Mikocheni B, Dar es Salaam, Tanzania

Abstract

Processing potato tubers into flour can be done using various methods, which can impact the flour’s nutritional and pasting properties. This study evaluated the effects of five different processing methods, namely, low-temperature blanching, followed by oven drying (LTB_OD), high-temperature blanching followed by oven drying (HTB_OD), boiling followed by oven drying (Boiling_OD), freeze drying (FD), and oven drying (OD), on the nutritional and pasting properties of potato flour derived from Shangi potato variety. The relationships between the nutritional and pasting properties were determined using Pearson’s correlation and principal component analyses (PCA). The results indicated that freeze-dried flour exhibited higher protein content (10.17%), sucrose (88.87 mg/100 g), and magnesium (44.90 mg/100 g) content, while Boiling_OD flour showed the lowest protein (6.41%), sucrose (15.34 mg/100 g), and magnesium (35.55 mg/100 g) content. All potato flour types demonstrated a decrease in apparent viscosity with increasing shear rate, with freeze-dried flour having the highest apparent viscosity. Freeze-dried flour showed the highest peak viscosity (7098.33 cP) and breakdown viscosity (2672.00 cP). The highest final viscosity (7989.00 cP) was recorded in HTB_OD flour. Protein ( r = 0.92 ), fiber ( r = 0.81 ), and fat ( r = 0.83 ) negatively correlated with the peak viscosity, while sugars (glucose ( r = 0.95 ), fructose ( r = 0.93 ), and sucrose ( r = 0.87 )) and phosphorus ( r = 0.86 ) positively correlated with pasting properties. The first two principal components explained 90.2% of the total variance. Oven drying and freeze drying were in close proximity in the PCA score plot, indicating that these two flour types have similar chemical and pasting properties. In conclusion, the different processing methods altered the chemical and pasting properties of the flour, therefore influencing their potential use in the food industry. Considering the correlations established in this study, it is likely that chemical properties could be used to predict the pasting properties of potato flour.

Funder

Graduate Training Assistantship Program

Publisher

Hindawi Limited

Subject

General Chemical Engineering,General Chemistry,Food Science

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