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. 2021 Oct 5;30(10):1331-1338.
doi: 10.1007/s10068-021-00977-x. eCollection 2021 Oct.

Elastic gels based on flaxseed gum with konjac glucomannan and agar

Jisoo Yang #  1 , Junghoon Kim #  2 , Young Jin Choi  3   4 , Jungwoo Hahn  3
Affiliations

Elastic gels based on flaxseed gum with konjac glucomannan and agar

Jisoo Yang et al. Food Sci Biotechnol. .

Abstract

In this study, we prepared hydrocolloid gels in which flaxseed gum (FSG), konjac glucomannan (KGM), and agar (AG) were blended in different ratios for use as a viscoelastic food. The prepared hydrogels' physicochemical properties were analyzed concerning their water solubility index (WSI), swelling power (SL), frequency sweep results, and microstructures. As the FSG ratio decreased, the WSI value of the compound gel tended to increase. However, it showed a tendency to have a relatively high SP value and a low tan δ value according to a specific KGM/FSG/AG mixing ratios (8:2:1.5 and 6:4:1.5). Through microstructure analysis, the FKA821.5 sample showed a relatively small, monodispersed gel building structure, correlated with the rheological results. In conclusion, the FKA821.5 gel was determined to have good water retention capacity and high structural strength. These results are expected to increase the applicability of FSG-based gelling agents in the food industry.

Keywords: Agar (AG); Flaxseed gum (FSG); Gel strength; Konjac glucomannan (KGM); Microstructure; Water retention.

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Conflict of interest statement

Conflict of interestDeclare any conflicts of interest, or state that there are none to declare.

Figures

Fig. 1
Fig. 1
Simple extraction process of flaxseed gum
Fig. 2
Fig. 2
Photos of hydrocolloid gels composed of different ratios of FSG, KGM, and AG [(A) FKA280, (B) FKA550, (C) 20, (D) FKA280.5, (E) FKA550.5, (F) FKA820.5, (G) FKA281, (H) FKA551, (I) FKA821, (J) FKA281.5, (K) FKA551.5, (L) FKA821.5]
Fig. 3
Fig. 3
Physicochemical properties of the hydrogels: (A) water solubility index and (B) swelling power. Data of different alphabets were different with statistical significant (p < 0.05)
Fig. 4
Fig. 4
Frequency sweep curves of FKA hydrogels. Storage modulus (G′) and loss modulus (G″) of FKA hydrogels at AG ratios of (A) 0.5, (B) 1, and (C) 1.5. The frequency ranged from 0.01 Hz to 1 Hz. (D) Loss tangent (tan δ) of FSG/KGM/AG compound gels at 0.1 Hz. Data of different alphabets in the same column were different with statistical significant (p < 0.05). The solid lines and dashed lines in (A)–(C) meant G′ and G″, respectively
Fig. 5
Fig. 5
SEM images of the microstructures of hydrogel samples: (A) FKA1001.5, (B) FKA821.5, (C) FKA281.5, and (D) FKA0101.5. Samples are shown at 300× magnification
See this image and copyright information in PMC

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