Wuram blueberries a anthocyanin pii wom yɛ nneɛma a agye din a Amerika Atifi fam de kɔ amannɔne a wɔde frigye ayɛ. Anthocyanin yɛ core selling‐point, nanso ɛyɛ mmerɛw sɛ ɔhyew bɛsɛe ne oxidative sɛe. Nneɛma a wɔyɛ no pii hu amane wɔ anthocyanin a wɔhwere kɛse ne nneɛma a etwa to a ɛyɛ tuntum a gua so sika a wɔtew so kɛse. Anthocyanin a wɔkora so yiye no ntumi mfa ne ho nto freeze‐dryer hardware nkutoo so; adwumayɛ anammɔn biara hia sɛ wɔhwɛ so denneennen.
Wɔ pretreatment mu: tew bere tenten a mframa‐a wɔde hyɛ mu bere a nnuaba abubu akyi. Wie nneɛma a wɔhyehyɛ na hohoro ntɛmntɛm na kwati sɛ wode bɛhyɛ nsu mu bere tenten. Siw pulp a ɛbɛbɔ dodo no ano. Pulp‐breakage pii ma contact‐area a ɛda anthocyanin ne oxygen ntam no yɛ kɛse na ɛma oxidation rate yɛ ntɛmntɛm.
Wɔ pre‐freezing mu no: fa raw‐materials gu nwini mu ntɛmntɛm na ama wɔato mu active constituents mu, nanso kwati ultra‐rapid‐freezing a ɛbɔ nkwammoaa mu kɛse. Fa cooling‐rate a ɛfata ma solidification ntɛmntɛm bere a ɛtew nkwammoaa‐sɛe a nsukyenee‐crystal piercing de ba no ase. Nkwammoaa nhyehyɛe a enni dɛm no ma anthocyanin kɔ so sie nkwammoaa mu.
Wɔ sublimation phase mu: katee anohyeto maximum shelf‐temperature, efisɛ ɔhyew a ɛkorɔn tẽẽ ntɛmntɛm thermal decomposition of anthocyanin. Kura chamber vacuum level pa mu na ama oxygen partial‐pressure ne slow‐down oxidation reaction no akɔ fam. Mma ɔhyew‐ɔhyew nkɔ soro mma nneɛma a wɔyɛ no tiawa nkutoo, anyɛ saa a, active‐substance loss bɛkanyan.
Sɛ wɔde nsuo gu mu a: nneɛma a anthocyanin dɔɔso wom no yɛ oxygen‐sensitive kɛseɛ wɔ freeze‐drying akyi. Wɔpɛ nitrogen back‐filling na ama oxygen a ɛkɔ mu no so atew. Fa vacuum nitrogen ahyɛ mu ma nneɛma a wɔde ahyɛ mu ma ntɛm ara bere a wɔayi afi mu akyi na fa nkotoku a akwanside kɛse wom no tom. Fa nneɛma a wɔawie sie adekoradan a ɛyɛ nwini a ɛyɛ sum mu, efisɛ hann nso ma anthocyanin sɛe ntɛmntɛm.
Raw‐material a wɔde bedi dwuma nso ho hia. Di nnuaba a wɔayɛ no foforo ho adwuma ntɛm ara bere a wɔatwa awie no; kwati sɛ wode dan mu hyew bɛboaboa ano bere tenten. Nnuaba a wɔayɛ no foforo a wɔde sie bere tenten no ma anthocyanin yera dedaw ansa na wɔafi ase de ahyɛ frigye mu. Nhwɛsoɔ a wɔayɛ no pɛpɛɛpɛ wɔ raw‐material, pre‐freezing, sublimation, discharging‐packaging ne warehousing mu ma wotumi yɛ freeze‐dried berries a anthocyanin retention rate a ɛkorɔn no a ɛyɛ den.
