کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6400420 | 1330875 | 2015 | 5 صفحه PDF | دانلود رایگان |

- Adducts were formed between β-lactoglobulin and sulfhydryl reagents during heating.
- The adducts were identified by 1D PAGE and mass spectroscopy.
- According to mass spectroscopy, 1:1 adducts were formed with NEM and DTNB.
β-Lactoglobulin (β-Lg) is relatively unstable during thermal processes used in the dairy industry. One of many ways to improve the heat stability of β-Lg is by chemical modification by protein-reagent binding. Potential reagents, such as 5,5'-dithiobis-2-nitrobenzoic acid (DTNB) and N-ethylmaleimide (NEM), bind to the exposed free sulfhydryl (-SH) group of denatured β-Lg and prevent it from being involved in protein aggregation reactions. However, no study has shown the specific binding of these reagents to β-Lg. Furthermore, the question of how many molecules of these reagents bind to β-Lg remains unanswered. In this research, the reactions of DTNB or NEM with the reactive monomers of β-Lg were identified by the presence of bands for 5-thio-2-nitrobenzoyl (TNB)- or NEM-modified monomers on Native-PAGE and Non-Reducing (NR) sodium deodecyl sulphate (SDS)-PAGE gels, and by an additional mass of β-Lg monomers corresponding to a molecule of TNB or NEM in mass spectra.
Journal: LWT - Food Science and Technology - Volume 63, Issue 2, October 2015, Pages 934-938