- 著者
-
Agus Bahar Rachman
赤澤 隆志
小川 雅廣
- 出版者
- 日本食品化学学会
- 雑誌
- 日本食品化学学会誌 (ISSN:13412094)
- 巻号頁・発行日
- vol.27, no.1, pp.10-21, 2020
Olive leaf (<i>Olea europaea</i> L.) is an underutilized resource of olive tree but has a high polyphenol content, so it has the potential to be used as a food ingredient. In this study, we investigated the effects of olive leaf water extracts on the physical properties of chicken breast sausage (CBS). Olive leaf water extracts were prepared at 4 (OEx<sub>4</sub>) and 80°C (OEx<sub>80</sub>) from dried olive leaf powder and they were applied to CBS preparation within the concentration range 0.05 to 0.5% (w/w minced meat). OEx<sub>4</sub> had 32% lower polyphenol content than OEx<sub>80</sub>. Water content, expressible water, breaking strength, and viscoelastic properties of CBS with OEx<sub>4</sub> and OEx<sub>80</sub> were measured. The analyses of the sausage physical properties showed that adding 0.1% OEx<sub>4</sub> increased the breaking stress (115%), breaking strain (68%), modulus of elasticity (20%), coefficient of viscosity (23%), and water-holding capacity (9%), and the enhancement effects of OEx<sub>4</sub> were much greater than those of OEx<sub>80</sub>. The gel network of OEx<sub>4</sub>-containing CBSs observed by scanning electron microscopy was finer and denser than that of the control CBS. Chemical analyses of the meat proteins showed that OEx<sub>4</sub> induces polymerization of myofibril proteins, especially myosin, via non-disulfide covalent bridges formed between amino and/ or thiol groups. These results indicate that the application of OEx<sub>4</sub> improves the sausage gel properties by inducing non-disulfide-type protein polymerization. This study supports the feasibility of OEx<sub>4</sub> as a new ingredient to improve the texture of gel products prepared from chicken breast minced meat.