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Restoring fresh texture in cooked aged rice with reducing agents.

Meimei Diao1, Yubao Guo1, Wennan Tian1

  • 1School of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China.

Food Research International (Ottawa, Ont.)
|May 22, 2019
PubMed
Summary

This study tested whether ascorbic acid and sodium sulfite could restore the texture of aged rice to match fresh rice. Aged rice tends to become harder and less sticky, which is unappealing to consumers. The researchers found that both agents successfully reversed these changes, making aged rice feel like fresh rice again. Ascorbic acid caused starch granules to swell and develop larger dents, while sodium sulfite led to smaller dents and granule separation. The effects were stronger at higher concentrations of the agents. These findings suggest that reducing agents can be used in food processing to improve the texture of aged rice. The study also provides insights into how rice ages and how texture changes can be reversed.

Keywords:
AgingEating qualityQuality controlReducing agentRestoring freshnessRiceTextureaged rice texturereducing agents in foodstarch granule behaviorfood processing techniques

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Area of Science:

  • Food science and technology
  • Cereal chemistry
  • Texture analysis in food processing

Background:

Aged rice often loses desirable texture traits, such as hardness and stickiness, when cooked. These changes are linked to starch retrogradation and structural modifications during storage. Prior research has shown that aging causes starch granules to harden and lose moisture, leading to tougher, less palatable rice. However, the mechanisms behind texture restoration remain unclear. This gap motivated researchers to investigate whether reducing agents could reverse these effects. No prior work had resolved how different agents impact starch granule structure. The study aimed to compare ascorbic acid and sodium sulfite, two common reducing agents, to determine their effectiveness in restoring aged rice texture. Researchers sought to understand if these agents could mimic fresh rice properties. The focus was on gelatinization behavior and starch granule morphology.

Purpose Of The Study:

The study aimed to evaluate the effects of ascorbic acid and sodium sulfite on the texture of cooked aged rice. The specific problem addressed was the loss of softness and stickiness in aged rice, which affects consumer acceptance. The motivation was to identify practical methods to restore aged rice to fresh-like texture. Researchers wanted to determine if these agents could reverse structural changes in starch granules. They also aimed to compare the agents' mechanisms of action. The goal was to provide insights into the aging process of rice. The study sought to establish a dose-dependent relationship for texture restoration. The findings could guide food processing strategies for aged rice.

Main Methods:

The study used ascorbic acid and sodium sulfite as reducing agents. Rice samples were aged and then treated with varying concentrations of the agents. Texture parameters like hardness and stickiness were measured using a texture analyzer. Starch granule morphology was examined using scanning electron microscopy. Particle size distribution was analyzed to assess granule swelling and separation. The study compared the effects of both agents on aged rice texture. Data were analyzed statistically to determine significance (p < 0.05). The methods focused on structural and functional changes in starch granules.

Main Results:

Both ascorbic acid and sodium sulfite significantly restored aged rice texture to fresh rice levels (p < 0.05). Hardness and stickiness values were fully restored to those of fresh rice. The stickiness/hardness ratio also returned to fresh rice levels. Ascorbic acid caused starch granules to swell and develop larger dents. Sodium sulfite resulted in smaller dents and granule deagglomeration. Ascorbic acid enhanced granule swelling and separation. Sodium sulfite primarily promoted granule separation. The effects showed a clear dose-dependent relationship.

Conclusions:

The study concluded that both reducing agents can restore aged rice texture to fresh rice levels. Ascorbic acid and sodium sulfite altered starch granule behavior during cooking. Ascorbic acid caused granule swelling and larger dents. Sodium sulfite led to granule separation and smaller dents. The dose-dependent effect suggests optimal concentrations for maximum restoration. The findings indicate that gelatinization behavior is key to texture changes. These agents can serve as probes to study rice aging mechanisms. The authors propose that these methods could be applied in food processing.

Ascorbic acid and sodium sulfite alter starch granule structure during cooking, restoring hardness and stickiness to fresh rice levels.

Ascorbic acid causes granule swelling and larger dents, while sodium sulfite promotes deagglomeration and smaller dents.

Granule morphology changes indicate how reducing agents affect gelatinization behavior, which determines rice texture.

Particle size analysis shows how agents influence granule separation and swelling, which affects texture restoration.

Higher concentrations of agents lead to greater texture restoration, suggesting optimal usage for food processing.

The agents can be used to restore aged rice texture, potentially improving consumer acceptance and reducing waste.