1. Zotsatira za xylo-oligosaccharides pakukula ndi kupanga asidi wa mitundu ya yogati.

Kuyesa kupanga

Zida zoyesera: mkaka watsopano,xylo-oligosaccharides, Lactobacillus bulgaricus (Lb), Streptococcus thermophilus (St).

Yambitsani Lactobacillus bulgaricus ndi Streptococcus thermophilus mu mkaka wa skim katatu mpaka ntchito yawo itakhazikika (poyang'aniridwa ndi kuunika kwa microscopic ndi mkaka wowawa), kenaka muzisunga mufiriji kuti mudzagwiritse ntchito mtsogolo. Njira yoyesera: Konzani zitsanzo 21 zofanana za mkaka watsopano ndikuzigawa m'magulu atatu, ndi zitsanzo zisanu ndi ziwiri pagulu lililonse. Onjezani zochulukira (%, w/v) za 0, 0.5, 0.6, 0.7, 0.8 ku zitsanzo za gulu lililonse. , 0,9 ndi 1.0 xylo-oligosaccharides, ndi kusakaniza Lb ndi St mu chiwerengero cha 2: 1, 1: 1, ndi 1: 2 motero kuti apange chikhalidwe choyambirira, ndiyeno mulowetse m'magulu a 3 ndi inoculation kuchuluka kwa 3%. Kuwira pa kutentha kosalekeza kwa 42°C, ndikutenga zitsanzo pafupipafupi kuti muyeze kuchuluka kwa mabakiteriya otheka, pH mtengo, acidity ndi lactic acid zomwe zili mugulu lililonse la mkaka.

zotsatira za mayeso

(1) Lb: St = 2: 1, zotsatira za xylo-oligosaccharides pakukula ndi kupanga asidi wa yogurt fermentation strains.

Monga tikuwonera pa Chithunzi 1, 0 mpaka 1.5 h ndi nthawi yosinthika ya zovuta komanso gawo loyambirira lolowa gawo la kukula kwa logarithmic. Kupsyinjika sikukula mofulumira, pH mtengo umachepetsa pang'onopang'ono, ndipo acidity ndi lactic acid zimakula mofulumira. Pamene xylo-oligosaccharide ndende ndi 0.7%, mabakiteriya okwana Mtengo wapamwamba ndi 1.94×108 CFU/mL (kuwongolera ndi 1.15×108 CFU/mL), ndi pH, acidity ndi lactic acid zili zofanana ndi ulamuliro; pakati pa 1.5 h ndi 3.5 h, zovutazo zimalowa mu gawo la kukula kwa logarithmic ndipo limakula mofulumira. PH idatsika mwachangu, ndipo acidity ndi lactic acid zomwe zidakwera zidakula mwachangu. Pamene xylo-oligosaccharide ndende inali 0.7%, chiwerengero chachikulu cha mabakiteriya chinali 5.65.×108 CFU/mL (kuwongolera kunali 5.41×108 CFU/mL). PH, acidity, ndi lactic acid zili 5.82, 63 ndi 4.93 motero, ndipo pH, acidity ndi lactic acid zomwe zili mu ulamuliro zinali 6.05, 56 ndi 4.67. Kuchokera pa 3.5 mpaka 4.5 h, chiwerengero chonse cha mabakiteriya chinachepa, pH inatsika pang'onopang'ono, ndipo acidity ndi lactic acid okhutira amawonjezeka pang'onopang'ono.

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