Effects of salt percentage (0.5 or 1%), combination (NaCl or NaCl/KCl) and stage of adding salt on biochemical, microbiological and sensory characteristics of probiotic Doogh

Arab, Seyese Masumeh; Mortazavian, Seyed Amir Mohammad; Azad Niya, Ebrahim; Komeili, Rozita; Alimiri, Tara; Najafi, Maryam; Adeli Mirzai, Abolfazl

Effects of salt percentage (0.5 or 1%), combination (NaCl or NaCl/KCl) and stage of adding salt on biochemical, microbiological and sensory characteristics of probiotic Doogh

Authors

Seyese Masumeh Arab

Seyed Amir Mohammad Mortazavian

Ebrahim Azad Niya

Rozita Komeili

Tara Alimiri

Maryam Najafi

Abolfazl Adeli Mirzai

Abstract

The combined effects of salt percentage (0.5 or 1%), its adding order (before or after the fermentation) and different ratios of NaCl/KCl (100/0 and 50/50) were used in the probiotic Doogh. Two probiotic bacteria (Lactobacillus acidophilus LA-5 and Bifidobacterium lactis BB-12), along with the yogurt bacteria were used. pH, acidification and redox potential were measured during the fermentation period. Moreover, viability of probiotic bacteria was determined within 7-day intervals during the storage period. The sensory parameters were also evaluated at days 0 and 21. The partial substitution of NaCl with KCl in the studied concentration had a positive influence on the viability of probiotics. Treatments containing 1% NaCl/KCl and 0.5% NaCl/KCl which were added before fermentation showed the maximum viability of probiotics. The treatments with 0.5% NaCl and then 0.5% NaCl/KCl before fermentation showed higher acceptance. Thus the substitution of 0.5% NaCl with KCl was acceptable. In whole, the treatment containing 0.5% NaCl/KCl before fermentation was the best one for probiotic Doogh with substituted salt.

Keywords

Doogh

Fermented milks

Salt

Probiotic

Viability