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Effect of a Kokumi Peptide, γ-Glutamyl-Valyl-Glycine, on the Sensory Characteristics of Foods

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Koku in Food Science and Physiology

Abstract

Certain foods are known to have flavor characteristics such as continuity and mouthfulness which cannot be explained by the five basic tastes alone. It has been demonstrated that these sensations are evoked by the addition of kokumi substances, flavor modifiers with no taste of their own, which are considered to be one of “koku”-imparting factors. Recent studies have demonstrated that kokumi substances such as glutathione are perceived via the calcium-sensing receptor (CaSR). Screening with CaSR assay and sensory evaluations have shown that γ-glutamyl-valyl-glycine (γ-Glu-Val-Gly) is a potent kokumi peptide. In the present study, the sensory effects of γ-Glu-Val-Gly on chicken consommé, reduced-fat peanut butter, and reduced-fat custard cream were investigated by descriptive analysis. Chicken consommé containing γ-Glu-Val-Gly had significantly stronger umami, mouthfulness, and mouth-coating characteristics than those of the control. In addition, γ-Glu-Val-Gly significantly increased the oiliness, thick flavor, and aftertaste of reduced-fat peanut butter, significantly increased the thickness of taste of reduced-fat custard cream, and significantly increased the aftertaste of reduced-fat French dressing. These data indicated that a kokumi peptide, γ-Glu-Val-Gly, can enhance umami, mouthfulness, and mouth-coating of chicken consommé; enhance oiliness, thickness of taste, and aftertaste of reduced-fat peanut butter; enhance thickness of taste of reduced-fat custard cream; and enhance aftertaste of reduced-fat French dressing. As a kokumi substance, γ-Glu-Val-Gly has no taste of its own; it can therefore be used to improve the flavor of both savory and sweet foods.

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Abbreviations

γ-Glu-Val-Gly:

γ-Glutamyl-valyl-glycine

GSH:

Glutathione

CaSR:

Calcium-sensing receptor

FEMA:

Flavor and extract manufacturers association

IMP:

Inosine monophosphate

JECFA:

The joint FAO/WHO expert committee

MSG:

Monosodium glutamate

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Acknowledgments

We sincerely thank Dr. Kiyoshi Miwa, Dr. Tohru Kouda, and Dr. Yuzuru Eto of Ajinomoto Co., Inc., for their encouragement and continued support of this work. We thank Ms. Sharon McEvoy and Dr. Dawn Chapman of the National Food Laboratory LLC for their cooperation and a valuable discussion. We thank Ms. Yang Xiao Qing and Ms. Tao Wei in Shanghai Ajinomoto R&D Center for their cooperation. We sincerely thank Dr. Hiroshi Miyano, Dr. Toshimi Kizukoshi, Ms. Naoko Kageyama, Ms. Yumiko Kato, Ms. Junko Yamazaki, and Ms. Yuko Kai. We are grateful to Dr. Chinatsu Kasamatsu, Dr. Hiroya Kawasaki, Mr. Hiroaki Nagasaki, Mr. Tomohiko Yamanaka, Mr. Fusataka Kenmotsu, Mr. Toshifumi Imada, Mr. Takashi Miyaki, Mr. Takaho Tajima, Mr. Shuichi Jo, Mr. Keita Sasaki, and Ms. Takako Hirose of Ajinomoto Co., Inc., for their assistance. We are grateful to the panelists who have participated on the sensory evaluation.

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Correspondence to Motonaka Kuroda .

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Kuroda, M., Miyamura, N. (2019). Effect of a Kokumi Peptide, γ-Glutamyl-Valyl-Glycine, on the Sensory Characteristics of Foods. In: Nishimura, T., Kuroda, M. (eds) Koku in Food Science and Physiology. Springer, Singapore. https://doi.org/10.1007/978-981-13-8453-0_7

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