The potential of fermented goat milk using Lactobacillus plantarum and Streptococcus thermophilus added by red guava (Psidium guajava l.) as antibacterial agent for skin

In this study, fermented goat milk combined with Lactobacillus plantarum and Streptococcus thermophilus were used with the addition of 5% pasteurized red guava juice ( Psidium guajava L.). This study focused on pH, total bacterial count (TPC), and antibacterial activity against Propionibacterium acnes and Staphylococcus aureus . This study used a fully randomized design (CRD) with three treatments with a combination of Lactobacillus plantarum (LP) and Streptococcus thermophilus (ST), P1 = 2% LpSt3%; P2=LP3%: St2%; and P3=Lp4%: 1%. In this case, each treatment was repeated 6 times. The results showed that pH values ranged from 3.66 to 3.69 and total plate counts (TPC) ranged from 8.54 to 8.61 CFU/mL. Furthermore, antimicrobial test revealed a zone of inhibition diameters ranging from 9.75 to 10.83 mm and 7.58 to 13.17 mm against Propionibacterium acnes and Staphylococcus aureus , respectively. In summary, fermented goat milk using Lactobacillus plantarum and Streptococcus thermophilus , with red guava juice ( Psidium guajava L.) treated with a combination of Lp 3% and St 2% starter, was effective against Propionibacterium acnes . It also indicates that the product contains antibacterial agent.