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Journal of Food Technology Research

December 2020, Volume 7, 2, pp 202-211

Preservative Effects of Ginger (Zingiber officinale), Tumeric (Curcuma longa) Extract and Citric Acid and Pasteurization on the Nutritional Quality and Shelf Life of Tiger-Nut Non-Dairy Milk

Olasunmbo A. Ajayi

,

Toluwalope I.Bankole

Olasunmbo A. Ajayi 1 ,

Toluwalope I.Bankole 1 
  1. Food Science and Technology, College of Agriculture, engineering and Science, Bowen University, Iwo, Osun State, Nigeria. 1

Pages: 202-211

DOI: 10.18488/journal.58.2020.72.202.211

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Article History:

Received: 23 September, 2020
Revised: 12 October, 2020
Accepted: 28 October, 2020
Published: 16 November, 2020


Abstract:

Tiger nut (Cyperus esculentus) non-dairy milk is a plant milk and a rich source of nutrients. However, milk from animal or plant is highly perishable. The focus of this study was to evaluate the influence of inclusion of preservatives and pasteurization on the quality of tiger nut milk. Five samples were produced: control (0 % preservative); natural preservatives (ginger or tumeric extract); combination of ginger and turmeric and manufactured citric acid. Samples were stored at room and refrigeration temperatures and evaluated for 30 days. Analyses performed include physico-chemical and nutritional composition, microbial load and general acceptability of tiger nut non-dairy milk samples using standard methods. Tiger nut non-dairy milk without preservative was generally accepted, while milk with ginger extract scored higher in appearance. Values ranged from (5.9 - 6.1), (5.2 - 6.8), (4.8 - 6.5); and (0.05 - 0.17 %); (0.04 – 0.15%); (0.05 – 0.17 %) for 0; 15 and 30 days respectively for pH and total titratable acidity. Total viable counts were (<1 to 5.9±1.8ax106 CFU/mL); enterobacteriaceae, (<1 to 5.4±0.7ax106 CFU/mL), Staphylococcal (3.3±1.0d x105 to 4.2±0.9bx106 CFU/mL) and fungal (<1 to 4.5±0.5ax106 CFU/mL). Moisture content (85.6 to 87.8 %), protein (3.7 - 4.3 %), ash (0.7– 1.8 %), crude fat (3.5 – 4.57 %). Sodium and potassium content ranged from (178.2 - 431.9 mg/kg) and (52.5– 416.2 mg/kg) respectively. The L* value ranged from (75.2–79.7). Conclusively, tiger nut non-dairy milk with natural preservative was as effective as manufactured citric acid in reducing the microbial content and maintaining the nutrients.
Contribution/ Originality
This study contributes to the existing literature to the versatility of underutilized Tigernut. This crop can be converted to several food products including non-dairy milk. Natural preservative extracts were effective in preserving this nutritious plant milk. Preserving plant milk with turmeric extract is a novel idea to our knowledge.

Keywords:

Tigernut non-dairy milk, Preservatives, Ginger, Tumeric.

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Funding:

This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.

Acknowledgement:

Both authors contributed equally to the conception and design of the study.

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