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Influence of quince seed mucilage-alginate composite hydrogel coatings on quality of fresh walnut kernels during refrigerated storage

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Abstract

The presence of high unsaturated fat content and polyphenols results in the short storage life of fresh walnut kernels. For prolonging their shelf life, edible coatings incorporated with antimicrobial compounds can be used as a tool. Quince seed mucilage was identified as a novel green biomaterial to be explored as a coating substance. Quince seed mucilage and sodium alginate were mixed in five different proportions of 100:0 (QAH1), 80:20 (QAH2), 60:40 (QAH3), 40:60 (QAH4), and 20:80 (QAH5) and the resultant composite hydrogels were studied for different physical properties. These composite hydrogels incorporated with vanillin were coated on fresh walnut kernels while uncoated samples served as control. Composite hydrogel coatings with a higher proportion of QSM retained a higher whiteness index, lightness (L*), DPPH radical scavenging capacity, total phenolic content, and overall acceptability values in walnut kernels during the entire storage period of 35 days. QAH1 showed the lowest weight loss percentage, lipid oxidation, and yeast and mold counts while the control sample showed the highest (P < 0.05) values. The results concluded that quince-based composite hydrogel coatings were effective in retention of quality and prevention of degradation of fresh walnut kernels during the storage.

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Availability of data and materials

The datasets generated and/or analyzed during the current study are not publicly available due to privacy concerns but are available from the corresponding author upon reasonable request.

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Abbreviations

QAH:

Quince-alginate hydrogel

QSM:

Quince seed mucilage

DPPH:

1,1-Diphenyl-2-picryl-hydrazyl

ROS:

Reactive oxygen species

LOX:

Lipoxygenase

Ba:

Barium

Ca:

Calcium

Zn:

Zinc

WI:

Whiteness index

PV:

Peroxide value

KI:

Potassium iodide

Na2S2O3 :

Sodium thiosulphate

TBA:

Thiobarbituric acid

TBARS:

Thiobarbituric acid reactive substance

CFU:

Colony forming unit

ANOVA:

Analysis of variance

PAL:

Phenylalanine ammonia-lyase

GAE:

Gallic acid equivalent

GABA:

Gamma-aminobutyric acid

PPO:

Polyphenol oxidase

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Acknowledgements

The authors are grateful to the SKUAST-K and IUST for providing laboratory facilities.

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  1. Materials Chemistry and Engineering Research Laboratory, Department of Chemistry, National Institute of Technology Srinagar J&K, Srinagar, 190006, India

    Sabreena Yousuf & Shrikant S. Maktedar

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  1. Sabreena Yousuf
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  2. Shrikant S. Maktedar
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SY conducted laboratory experiments and also analyzed the results from the experiments as well as wrote the manuscript. SSM supervised the laboratory experiments, provided suggestions for improvements, helped analyze results, and also edited portions of the manuscript.

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Correspondence to Shrikant S. Maktedar.

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Yousuf, S., Maktedar, S.S. Influence of quince seed mucilage-alginate composite hydrogel coatings on quality of fresh walnut kernels during refrigerated storage. J Food Sci Technol 59, 4801–4811 (2022). https://doi.org/10.1007/s13197-022-05566-2

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