scholarly journals An Improved Method for Storing Yam (Dioscorea alata)

1969 ◽  
Vol 58 (4) ◽  
pp. 456-465
Author(s):  
J. R. Rivera ◽  
M. A. González ◽  
A. Collazo de Rivera ◽  
J. Cuevas-Ruiz
Keyword(s):  
Relative Humidity ◽  
Gamma Radiation ◽  
Storage Time ◽  
Practical Method ◽  
Dioscorea Alata ◽  
Improved Method ◽  
Ambient Conditions ◽  
Dormancy Period ◽  
Controlled Conditions ◽  
Significant Chemical

By storing cured yam tubers of the variety "Florido" (D. alata) at a temperature of 16° C and a relative humidity of 80 percent their dormancy period can be extended 4 additional months. No significant chemical changes are observed during the storage time. Their flavor remains unchanged and they lose very little weight. When yam tubers stored for 7 months under controlled conditions are treated with the sprout inhibitor CIPC in Dinafog form, their inactivity period is prolonged for 20 additional days. This sprout inhibitor could be used as a good and practical method to increase the transit period of the tubers if and when its use is authorized. The effects of gamma radiation in yam tubers stored for 7 months under controlled conditions were also studied. Irradiation doses of 7.5 and 10 Krad controlled their sprouting process satisfactorily. No change was observed in flavor. Treatments with 7.5 and 10 Krad doses extend the dormancy period of the tubers kept at prevailing ambient conditions for 60 additional days, thus extending the yam shelf life.

scholarly journals Storage of Fresh Yam (Dioscorea alata L.) under Controlled Conditions

1969 ◽  
Vol 56 (1) ◽  
pp. 46-56
Author(s):  
M. A. González ◽  
A. Collazo de Rivera
Keyword(s):  
Relative Humidity ◽  
Storage Period ◽  
Dioscorea Alata ◽  
Ambient Conditions ◽  
Fresh Market ◽  
High Quality ◽  
Dormant Period ◽  
Weight Losses ◽  
Tropical Areas ◽  
Very High

Freshly harvested "Florido" yam tubers (a highly desirable variety of the species D. alata) were subjected to a temperature of around 32° C. (90° F.) and a relative humidity of 90 percent. Wounded tissues were suberized in about 4 days. This curing may be accomplished either in controlled environmental rooms or under tropical prevailing ambient conditions. The formation of the cork tissue during suberization protects tubers from infection by microorganisms if stored under reduced temperatures. Cured and uncured tubers were stored in a properly ventilated Forma Scientific room at 16° C. ± 1° (59° to 62.9° F.), and a relative humidity of 70 percent. Uncured samples suffered high losses due to physiological breakdown as well as markedly higher weight losses than similarly handled cured ones which showed no signs of internal decay during the storage period. Cured tubers kept under conditions noted above, at temperatures below those prevailing in tropical areas, had the dormant period lengthened by 4 additional months. High-quality tubers can be provided by this means for the fresh market and for processing during the off-season. Although the yam tubers hardened slightly during storage, weight losses were kept at a fairly low level and the palatability of the tubers remained very high, as determined by sensory evaluation.

Incidence of Internal Brown Spot Disease in White Lisbon Yams (Dioscorea alata) During Storage

1978 ◽  
Vol 14 (2) ◽  
pp. 167-172 ◽  
Author(s):  
S. H. Mantell ◽  
S. Q. Haque
Keyword(s):  
Relative Humidity ◽  
Disease Incidence ◽  
Lesion Size ◽  
Brown Spot ◽  
Tuber Quality ◽  
Dioscorea Alata ◽  
Ambient Conditions ◽  
Spot Disease ◽  
Internal Brown Spot ◽  
Brown Spot Disease

SUMMARYTubers of Dioscorea alata L. cv White Lisbon, affected by Internal Brown Spot (IBS) disease, and stored under ambient conditions on wooden or wire racks, did not show significant increases in IBS incidence and mean lesions over storage periods of up to 18 weeks. Storage under different conditions of temperature (13, 20 and 28 ± 3°C) did not have any significant effect on IBS incidence; but tubers stored under conditions of high relative humidity (95 ± 2%) showed less IBS and greater mean lesion diameters. Although a significant reduction in disease incidence occurred during storage under the latter conditions, the effects of increased lesion size resulted in some deterioration of tuber quality.

scholarly journals Effects of Sources and Forms of Vitamin K3 on Its Storage Stability in Vitamin Premixes or Vitamin Trace Mineral Premixes

Animals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1140
Author(s):  
Huakai Wang ◽  
Pan Yang ◽  
Longxian Li ◽  
Nan Zhang ◽  
Yongxi Ma ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Storage Time ◽  
Storage Stability ◽  
Choline Chloride ◽  
Crystal Form ◽  
Negative Effects ◽  
Trace Mineral ◽  
Vitamin K3 ◽  
Choline Group ◽  
Micro Sphere

Six types of vitamin K3 (VK3); two sources (menadione sodium bisulfite, MSB; menadione nicotinamide bisulfite, MNB), and three different forms (crystal, micro-capsule, and micro-sphere) were used to determine the retention of VK3 in vitamin premixes (Experiment 1) or vitamin trace mineral (VTM) premixes (Experiment 2) after 1, 2, 3, and 6 months of storage. The retention of VK3 in vitamin premixes was evaluated at 25 °C/60% relative humidity or 40 °C/75% relative humidity in an incubator in Experiment 1 and in VTM premixes (choline chloride: 0 vs. 16,000 mg/kg) stored at room temperature in Experiment 2. The VK3 retention in vitamin premix or VTM premix decreased significantly with the extension of storage time (p < 0.05). In Experiment 1, the VK3 retention was higher in the 25 °C/60% incubator (56%) than in the 40 °C/75% incubator (28%). The MNB retention (52%) was higher than MSB retention (32%). The retention of VK3 in micro-capsules (43%) or micro-spheres (48%) was higher than the crystal form (35%) after six months of storage. In Experiment 2, there was no difference between the retention of MSB (49%) or MNB (47%). The retention of VK3 of micro-capsule (51%) or micro-sphere (54%) was higher than that of crystal form (40%). The VK3 retention was higher in the choline-free group (51%) than in the choline group (47%) after six months of storage. Finally, the predicted equations of VK3 retention with storage time in vitamin premixes or VTM premixes were established. The R2 of the prediction equations was ≥0.9005, indicating that time is an important factor in predicting VK3 retention. In conclusion, the higher temperature-relative humidity, choline had negative effects on VK3 retention during premix storage. MNB retention was higher than MSB during storage of vitamin premix. The encapsulated forms of VK3, micro-capsules and micro-spheres, could improve VK3 storage stability in vitamin premix and VTM premix.

High-performance inverted planar perovskite solar cells without a hole transport layer via a solution process under ambient conditions

2015 ◽  
Vol 3 (38) ◽  
pp. 19294-19298 ◽  
Author(s):  
Xichang Bao ◽  
Qianqian Zhu ◽  
Meng Qiu ◽  
Ailing Yang ◽  
Yujin Wang ◽  
...  
Keyword(s):  
Relative Humidity ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Solution Process ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Ambient Conditions ◽  
High Quality ◽  
Ito Glass

High-quality CH3NH3PbI3 perovskite films were directly prepared on simple treated ITO glass in air under a relative humidity of lower than 30%.

The volatile exudates from germinating pea seeds of different viability and vigor

1985 ◽  
Vol 63 (6) ◽  
pp. 1035-1039 ◽  
Author(s):  
R. J. Gorecki ◽  
G. E. Harman ◽  
L. R. Mattick
Keyword(s):  
Gas Chromatography ◽  
Relative Humidity ◽  
Trichoderma Harzianum ◽  
Storage Time ◽  
Enterobacter Cloacae ◽  
Storage Condition ◽  
Seed Vigor ◽  
Embryonic Axes ◽  
Pea Seeds ◽  
Germinating Seeds

Pea seeds var. Kriter were stored aseptically at 92% relative humidity and 30 °C. After 0, 4, 6, 8, or 10 weeks of storage, viability, vigor, and volatile exudates were determined on sublots of seeds. As storage time increased, vigor, as measured by dehydrogenase activity, growth of embryonic axes, and conductivity decreased. Later, viability also decreased. Imbibing and germinating pea seeds produced ethanol, acetaldehyde, and lesser amounts of methanol. No qualitative differences in volatile exudates were observed from germinating seeds regardless of age or storage condition. Nonaged seeds with highest vigor produced the smallest amounts of volatiles, but with increased aging the quantities of ethanol and acetaldehyde gradually increased. Dry seed produced small quantities of both volatiles. The amount of these compounds produced reached a maximum between 12 and 48 h of germination. Infestation of seed samples with Enterobacter cloacae or Trichoderma harzianum reduced the quantities of these compounds measured. These results indicate that determinations of acetaldehyde and ethanol in the space over germinating seeds by means of gas chromatography may be a useful seed vigor test.

DISINFESTATION OF MANGOES HADEN IN-FESTED BY Anastrepha fraterculus (WIED., 1830) (DIPTERA, TEPHRITIDAE), WITH GAMMA RADIATION

2021 ◽  
Vol 9 (1A) ◽  
Author(s):  
Valter Arthur
Keyword(s):  
Relative Humidity ◽  
Radiation Dose ◽  
Gamma Radiation ◽  
Adult Stage ◽  
Mangifera Indica ◽  
Lethal Dose ◽  
Adult Emergence ◽  
Climate Chamber ◽  
Anastrepha Fraterculus

The objective of experiment was determinate the radiation dose for disinfestation to mango Mangifera indica cv. Haden, infested by Anastrepha fraterculus larvae. For realization of the experiment, were collected fruits in the field, which were taking to Entomology laboratory where there was a infestation by the flies in cages during 72 hours period. Waited for the development of the larvae and before 5 – 8 days to infestation, the mangos were irradiated in a Cobalt-60 source with doses of: 0(control), 50, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1.100, 1.200 and 1.300 Gy. After the irradiation, the fruits were placed in climate chamber with 25 ±5°C of temperature and 70±5% of relative humidity, posteriorly waited the larvae exit to out of the fruit until the transformation in pupae and posteriorly in adult stage. By the results obtained our can concluded that the lethal dose to larvae in mangoes infested with 5-8 days after infestation were 600 Gy and 1.000 Gy (0.6 and 1 kGy) respectively. The dose of 50 Gy prevented the total adult emergence for both treatments. 

scholarly journals Assessment of lettuce quality during storage at low relative humidity using Global Stability Index methodology

2012 ◽  
Vol 32 (2) ◽  
pp. 366-373 ◽  
Author(s):  
María Roberta Ansorena ◽  
María Victoria Agüero ◽  
María Grabriela Goñi ◽  
Sara Roura ◽  
Alejandra Ponce ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Relative Humidity ◽  
Global Stability ◽  
Water Content ◽  
Relative Water Content ◽  
Storage Time ◽  
Stability Index ◽  
Total Chlorophyll ◽  
External Zone ◽  
Relative Water

During postharvest, lettuce is usually exposed to adverse conditions (e.g. low relative humidity) that reduce the vegetable quality. In order to evaluate its shelf life, a great number of quality attributes must be analyzed, which requires careful experimental design, and it is time consuming. In this study, the modified Global Stability Index method was applied to estimate the quality of butter lettuce at low relative humidity during storage discriminating three lettuce zones (internal, middle, and external). The results indicated that the most relevant attributes were: the external zone - relative water content, water content , ascorbic acid, and total mesophilic counts; middle zone - relative water content, water content, total chlorophyll, and ascorbic acid; internal zone - relative water content, bound water, water content, and total mesophilic counts. A mathematical model that takes into account the Global Stability Index and overall visual quality for each lettuce zone was proposed. Moreover, the Weibull distribution was applied to estimate the maximum vegetable storage time which was 5, 4, and 3 days for the internal, middle, and external zone, respectively. When analyzing the effect of storage time for each lettuce zone, all the indices evaluated in the external zone of lettuce presented significant differences (p < 0.05). For both, internal and middle zones, the attributes presented significant differences (p < 0.05), except for water content and total chlorophyll.

scholarly journals Effect of Packaging Material, Storage Temperature and Duration on the Quality of Semi-Processed Adult House Cricket Meal

2017 ◽  
Vol 7 (1) ◽  
pp. 21 ◽  
Author(s):  
Edwin Kamau ◽  
Christopher Mutungi ◽  
John Kinyuru ◽  
Samuel Imathiu ◽  
C. Tanga ◽  
...  
Keyword(s):  
Storage Time ◽  
Storage Temperature ◽  
Color Change ◽  
Viable Count ◽  
Ambient Conditions ◽  
House Cricket ◽  
Product Quality And Safety ◽  
Conventional Foods ◽  
Penicillium Spp

Edible insects are widely consumed in different parts of the world and can serve as an alternative nutritional source to conventional foods. Nonetheless, little attention has been given to their quality and shelf life in different packages when exposed to different storage environments. In this study, the effect of storage temperature, duration and type of packaging on the storage stability of the adult house cricket meal was examined. The samples were boiled, solar dried, milled and packaged into polypropylene (PP), plastic (PL) and polyethylene (PL) packages. The samples were then stored for six months in refrigerated and ambient conditions where by changes in physical and biochemical attributes were monitored. Iodine values significantly decreased in all the packages while peroxide, p-anisidine and saponification values significantly increased. SFA, MUFA and PUFA contents reduced during storage although a higher tendency for MUFA and PUFA values was observed in the refrigerated samples. Total viable count (TVC) and yeast and molds counts significantly increased in storage. Three types of fungi; Aspergillus spp., Alternaria spp. and Penicillium spp. were isolated in all the packages. Overall color change steadily decreased with increase in storage time. Deterioration was higher in samples stored in ambient conditions than in refrigeration. The degree of deterioration in the two storage environments among the different packages was in the order; PP>PE>PL. Although the PL package outperformed the other packages it is recommended to carry out sensory analysis and avoid post-processing contamination that can adversely affect the product quality and safety during storage. 

scholarly journals An improved method to validate the relative humidity generation in sorption balances

2009 ◽  
Vol 72 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Lars Wadsö ◽  
Anders Anderberg ◽  
Ingrid Åslund ◽  
Olle Söderman
Keyword(s):  
Relative Humidity ◽  
Improved Method

Effects of High Temperature and Relative Humidity on Mold Content and Quality of Stored Popcorn†

1995 ◽  
Vol 58 (9) ◽  
pp. 1018-1022 ◽  
Author(s):  
SARATH K. KATTA ◽  
LLOYD B. BULLERMAN
Keyword(s):  
High Temperature ◽  
Relative Humidity ◽  
Storage Time ◽  
Gradual Increase ◽  
Mold Growth ◽  
Internal Mold ◽  
Aspergillus Glaucus ◽  
Plastic Bag ◽  
Open Container

White and yellow popcorn were stored in different containers at high temperature (35°C) and high relative humidity (85%) conditions for 3 months. Gradual decreases in popping volumes with the lengthening of storage time were observed in both white and yellow popcorn. Internal mold infection was quite low in both white (5.7%) and yellow (3.0%) popcorn at the beginning of storage tests. Few differences were found in total infection levels up to 60 days of storage, except that the Aspergillus glaucus group became established in place of field fungi. A gradual increase in mold infection levels was then observed during the remaining 30 days of storage. Visible mold growth was also observed on the tips of some kernels by the end of storage studies. Internal mold infection in white popcorn stored in an open container was lower (18.3%) than white popcorn stored in a closed plastic bag (75.0%) and closed plastic jar (85.3%), whereas the internal mold infection in yellow popcorn stored in an open container was higher (23.3%) than yellow popcorn stored in a closed plastic bag (6.3%) and closed plastic jar (2.6%). The A. glaucus group were the predominant molds found at the end of storage tests. The ability of toxigenic molds to invade the popcorn was determined using a dry spore inoculum. None of the inoculated molds, which included Aspergillus flavus, Penicillium martensii, and Penicillium viridicatum, were able to invade the popcorn during storage. However, the A. glaucus group predominated at the end of storage tests in the inoculated samples.

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